Prof. Ifor D. W. Samuel Profile

Prof. Ifor D. W. Samuel

Director Organic Semiconductor Ctr at Univ of St Andrews

SPIE Involvement:

Conference Program Committee | Symposium Chair | Editorial Board Member: Journal of Photonics for Energy | Author | Editor

Area of Expertise:

Organic semiconductor , Organic solar cell , Photophysics , OLED , Organic laser , Biophotonics

Websites:

Company Website

Profile Summary

Professor of Physics and Director of the Organic Semiconductor Centre, University of St Andrews, Scotland. Founder of Ambicare Health Ltd. Regional/Associate editor of Journal of Photonics for Energy, and Synthetic Metals. Fellow of the Royal Society of Edinburgh, SPIE, the Institute of Physics and the Royal Society of Chemistry. I lead a research group exploring the physics of organic semiconductor materials and devices - such as organic light-emitting diodes, solar cells and lasers. The group has particular expertise in photophysics including time resolved luminescence from femtosecond to microsecond timescales and its application to the development of advanced materials such as dendrimers and star-shaped truxenes. In addition I explore emerging applications of organic semiconductors, such as explosive sensing and skin cancer treatment. The work of the centre has been recognised through awards such as the Beilby Medal (Insitute of Materials, Royal Society of Chemistry and Society of the Chemical Industry), the Ben Sturgeon Award (Society for Information Display) and the academic R&D award (from idtechex at Printed Electronics USA). I am co-chair of the Organic Photonics and Electronics symposium at the annual Optics and Photonics meeting in San Diego and on the program committees for several SPIE conferences.

Publications (43)

Proceedings Article | 30 September 2024 Presentation

Presentation

Advances in organic polariton lasers

Mengjie Wei, Hamid Ohadi, Graham Turnbull, Ifor D. Samuel

Proceedings Volume PC13127, PC131270L (2024) https://doi.org/10.1117/12.3028517

KEYWORDS: Polaritons, Organic semiconductors, Excitons, Semiconductors, Polymers, Oscillators, Materials properties, Laser damage threshold, Fabrication

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Proceedings Article | 30 September 2024 Presentation

Presentation

How should we reduce efficiency roll-off in TADF OLEDs? A figure of merit approach

Stefan Diesing, Le Zhang, Thomas Sayner, Arvydas Ruseckas, Eli Zysman-Colman, Ifor D. Samuel

Proceedings Volume 13122, 131220P (2024) https://doi.org/10.1117/12.3028839

KEYWORDS: Organic light emitting diodes, Phosphorescent organic light emitting diodes, Light emitting diodes

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SPIE Journal Paper | 14 December 2023 Open Access

Open Access

Status report on emerging photovoltaics

Annick Anctil, Meghan Beattie, Christopher Case, Aditya Chaudhary, Benjamin Chrysler, Michael Debije, Stephanie Essig, David Ferry, Vivian Ferry, Marina Freitag, Isaac Gould, Karin Hinzer, Harald Hoppe, Olle Inganäs, Lethy Krishnan Jagadamma, Min Hun Jee, Raymond Kostuk, Daniel Kirk, Stephan Kube, Minyoung Lim, Joseph Luther, Lorelle Mansfield, Michael McGehee, Duong Nguyen Minh, Preeti Nain, Matthew Reese, Angèle Reinders, Ifor D. Samuel, Wilfried van Sark, Hele Savin, Ian Sellers, Sean Shaheen, Zheng Tang, Fatima Toor, Ville Vähänissi, Ella Wassweiler, Emily Warren, Vincent Whiteside, Han Young Woo, Gang Xiong, Xitong Zhu

JPE, Vol. 13, Issue 04, 042301, (December 2023) https://doi.org/10.1117/12.10.1117/1.JPE.13.042301

KEYWORDS: Solar cells, Photovoltaics, Solar energy, Silicon, Perovskite, Manufacturing, Sustainability, Dye sensitized solar cells, Design, Energy efficiency

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Proceedings Article | 1 October 2023 Presentation

Presentation

Approaches to electrically driven organic semiconductor lasers

Kou Yoshida, Junyi Gong, Graham Turnbull, Ifor D. Samuel

Proceedings Volume PC12659, PC126590D (2023) https://doi.org/10.1117/12.2681784

KEYWORDS: Semiconductor lasers, Organic semiconductors, Polarons, Optical pumping, Laser optics

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Proceedings Article | 8 June 2023 Presentation

Presentation

Efficiency roll-off in TADF OLEDs: don’t just maximise the RISC

Le Zhang, Stefan Diesing, Arvydas Ruseckas, Ifor D. Samuel

Proceedings Volume PC12584, PC1258403 (2023) https://doi.org/10.1117/12.2668433

KEYWORDS: Organic light emitting diodes, Metals, Medicine, Light sources and illumination, Iridium, Fluorescence, Biomedical applications

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Proceedings Article | 3 October 2022 Presentation

Presentation

Universal photophysical kinetic analysis for thermally activated delayed fluorescence (Conference Presentation)

Youichi Tsuchiya, Stefan Diesing, Eli Zysman-Colman, Ifor D. Samuel, Chihaya Adachi

Proceedings Volume PC12208, PC122080V (2022) https://doi.org/10.1117/12.2631810

KEYWORDS: Luminescence, Solid state physics, Phosphorescence, Energy transfer, Electroluminescence

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Proceedings Article | 30 May 2022 Presentation

Presentation

Low-threshold polariton lasing in fluorene-based oligomers

Graham Turnbull, Mengjie Wei, Arvydas Ruseckas, Van T. Mai, Atul Shukla, Ilene Allison, Shih-Chun Lo, Ebinazar Namdas, Ifor D. Samuel

Proceedings Volume PC12149, PC121490V (2022) https://doi.org/10.1117/12.2621585

KEYWORDS: Polaritons, Optical microcavities, Laser damage threshold, Photons, Excitons, Organic semiconductors, Superposition, Semiconductors, Semiconductor lasers, Quasiparticles

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Proceedings Article | 1 August 2021 Presentation

Presentation

The development of OLEDs for photodynamic therapy

Ifor D. Samuel

Proceedings Volume 11810, 118100J (2021) https://doi.org/10.1117/12.2596476

KEYWORDS: Photodynamic therapy, Organic light emitting diodes, Cancer, Resistance, Photosensitizer targeting, Oxygen, Medicine, Light sources, Fungi, Biology

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Proceedings Article | 5 March 2021 Presentation

Presentation

Visible light communication at over 1 Gbps using organic semiconductors

Ifor D. Samuel

Proceedings Volume 11709, 117090H (2021) https://doi.org/10.1117/12.2586594

KEYWORDS: Visible radiation, Organic semiconductors, Video, Transmitters, Receivers, Organic light emitting diodes, Data transmission, Data communications

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Proceedings Article | 22 August 2020 Presentation

Presentation

Charge diffusion and interface limited charge extraction in hybrid perovskite thin films

Ifor D. Samuel, Oskar Blaszczyk, Lethy Krishnan Jagadamma, Arvydas Ruseckas, Muhammad Sajjad

Proceedings Volume 11474, 114740O (2020) https://doi.org/10.1117/12.2569248

KEYWORDS: Diffusion, Perovskite, Interfaces, Thin films, Solar cells, Luminescence, Measurement devices, Lead

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Proceedings Article | 22 August 2020 Presentation

Presentation

OLEDs: Wearable light sources for medicine

Ifor D. Samuel, Cheng Lian, Marta Piksa, Katarzyna Matczyszyn, Kou Yoshida, Saydulla Persheyev, Krzysztof Pawlik, Fernanda Cabral, Martha Ribeiro, Jose Lindoso

Proceedings Volume 11475, 114750C (2020) https://doi.org/10.1117/12.2569250

KEYWORDS: Organic light emitting diodes, Light sources, Medicine, Photodynamic therapy, Light sources and illumination, Light, Phototherapy, Oxygen, Skin cancer, Bacteria

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Proceedings Article | 20 August 2020 Presentation

Presentation

Ultrafast OLEDs enable visible light communication at a gigabit per second

Ifor D. Samuel, Kou Yoshida, Pavlos Manousiadis, Rui Bian, Zhe Chen, Caroline Murawski, Malte Gather, Harald Haas, Graham Turnbull

Proceedings Volume 11473, 114730P (2020) https://doi.org/10.1117/12.2569249

KEYWORDS: Organic light emitting diodes, Visible radiation, Ultrafast phenomena, Organic optoelectronics, Optoelectronic devices, Spectroscopes, Ranging, Data communications, Internet

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Proceedings Article | 23 May 2018 Presentation

Presentation

Improving the thermal stability of OLEDs by doping the electron transport layer with a reactive metal (Conference Presentation)

Changmin Keum, Nils Kronenberg, Caroline Murawski, Kou Yoshida, Yali Deng, Wenbo Li, Mengjie Wei, Ifor D. Samuel, Malte Gather

Proceedings Volume 10687, 106870R (2018) https://doi.org/10.1117/12.2306785

KEYWORDS: Organic light emitting diodes, Doping, Electron transport, Cesium, Metals, Atomic layer deposition, Molecules, Thin films, Crystals, Annealing

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Organic light-emitting diodes (OLEDs) have reached a huge market as technology for small displays, e.g. in smartphones, and are entering the larger display and solid-state lighting markets as well. In parallel to these commercial successes, the OLED technology is adapted to a multitude of promising new applications, such as in optogenetics and medical therapy. However, it is still challenging to ensure good stability in applications that require high brightness (or high optical power density), in part due to the resulting resistive heating. Increased temperature can lead to a change in morphology of one or several organic layers, e.g. via crystallization of organic molecules, which then reduces electrical and optical performance and likely results in rapid device failure. Aside from an intrinsic resistive heating, heating can also be due to environmental effects during operation or fabrication and encapsulation of devices. For instance, atomic layer deposition (ALD) is a promising technique to form thin, yet highly protective encapsulation layers. However, state-of-the-art ALD processes require relatively high temperature during deposition (< 80 °C). 4,7-diphenyl-1,10-phenanthroline (BPhen) has been widely used as electron transporting layer (ETL) due its high electron mobility, particularly in an organic matrix-dopant system. However, it is well known that thin films of BPhen tend to recrystallize spontaneously. Annealing accelerates crystallization even further due to the relatively low glass transition temperature (Tg) of BPhen (62 °C). A straightforward way to enhance the device thermal stability is to make use of a high Tg material, yet materials have to be carefully adopted to provide appropriate functionality in OLEDs. In this contribution, we report the improvement of the thermal stability of OLEDs with BPhen based electron transport layers (ETLs) by cesium (Cs) doping. To verify the role of the Cs dopant in the BPhen matrix, recrystallization features of Cs-doped BPhen films with different doping concentrations were investigated using optical microscopy and atomic force microscopy. We also examined the photophysical properties of the films, i.e. photoluminescence (PL) and absorption. PL spectra exhibit monotonic red-shifts and broadening as the Cs doping concentration increases. This presumably indicates formation of metal complexes via interaction between the 1,10-phenanthroline group of BPhen molecules and the Cs ions. It was found that Cs plays a critical role, not only in inhibiting undesired recrystallization of BPhen molecules in a thin-film, but also in allowing BPhen layers to be thermally stable beyond the Tg of neat BPhen. Next, the electrical and optical properties of blue and red OLEDs that contain BPhen layers with different Cs-doping concentrations as ETL were characterized after annealing at temperatures between 60 and 100 °C. We find that higher doping concentrations lead to a marked increase in thermal device stability (quantified by current density and luminance at a fixed voltage). Making use of this observation, we successfully encapsulated BPhen based OLEDs with thin-film oxide layers using ALD. The results shown in this work may be transferable to other material systems and can thus provide a useful guideline to enhance the intrinsic thermal durability of organic devices and to render them compatible with processes involving thermal treatment.

Proceedings Article | 23 May 2018 Presentation

Presentation

Deep blue electroluminescence from D-A compounds with oxadiazole acceptor units exhibiting TADF (Conference Presentation)

Simonas Krotkus, Michael Wong, Gordon Hedley, David Cordes, Alexandra M. Slawin, Caroline Murawski, Malte Gather, Yoann Olivier, David Beljonne, Ifor D. Samuel, Eli Zysman-Colman

Proceedings Volume 10687, 1068703 (2018) https://doi.org/10.1117/12.2307090

KEYWORDS: Organic light emitting diodes, Electroluminescence, Luminescence, Light sources and illumination, Display technology, Televisions, Tablets, Platinum, Phosphorescence, Internal quantum efficiency

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In the past few decades Organic Light-Emitting Diodes (OLEDs) have matured to become a widespread display technology. Despite their commercial success in TVs, smartphones and tablet screens, several key issues still remain, especially if OLEDs are to become a viable technology for lighting. Metalorganic emitters based on Ir or Pt are widely used in OLED technology, due to their facile colour tunability, short phosphorescence lifetime and efficient intersystem crossing (ISC), which enables emission from both singlet and triplet states to be harnessed, leading to 100% internal quantum efficiency (IQE). However, these emitters are based on rare and toxic noble metals. In addition, efficient and stable blue and especially deep-blue phosphorescent emitters, which are essential for displays and lighting, are still to be demonstrated in order to replace currently used less efficient fluorescent blue OLEDs. Recently, purely organic emitters exhibiting thermally activated delayed fluorescence (TADF) mechanism were also shown to be capable of 100% IQE. Since efficient ISC in these compounds is based on the small singlet and triplet gap rather than heavy atom effect, TADF compounds represent a new class of potentially inexpensive emitters for next generation OLED displays and lighting. In this work, a series of four deep blue-to-green emitting TADF compounds have been synthesized and characterised. The compounds are based on the same scaffold as the dicarbazoyldicyanobenzene (2CzPN) reported by Adachi and co-workers, but with the replacement of the cyano groups by less electron-withdrawing oxadiazole moieties. The weaker acceptor strength of oxadiazole compared to cyano groups translates to more blue-shifted emission compared to 2CzPN. Additionally, higher spatial separation of HOMO and LUMO levels between acceptor and donor units, respectively, leads to a smaller singlet-triplet gap. This allows us to demonstrate efficient deep blue TADF OLEDs with CIE coordinates (0.16, 0.13), as compared to (0.16, 0.30) for 2CzPN devices. A thorough photophysical study of model compound 2CzPN and oxadiazole acceptor based derivatives will be presented both for solution and thin films. The blue oxadiazole compounds show up 75% quantum yield in solid state. The electrochemical and photophysical properties, as well as crystal structures are compared to the theoretical quantum chemical calculations of the studied compounds. The efficient emission properties coupled to the small singlet-triplet gap in these molecules allows us to demonstrate efficient electroluminescence (up to 10 % EQE) from the vacuum deposited OLEDs.

Proceedings Article | 21 April 2017 Presentation

Presentation

Evanescently pumped optofluidic distributed feedback lasers with aqueous gain fluids (Conference Presentation)

Markus Karl, Guy Whitworth, Marcel Schubert, Christof Dietrich, Ifor Samuel, Graham Turnbull, Malte Gather

Proceedings Volume 10081, 1008108 (2017) https://doi.org/10.1117/12.2250297

KEYWORDS: Refractive index, Dispersion, Biosensing, Diagnostics, Laser development, Waveguides, Biological detection systems, Laser marking, Nanosensors, Current controlled current source

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Proceedings Article | 28 January 2017 Paper

Paper

A comparative study of optical concentrators for visible light communications

Rahmat Mulyawan, Ariel Gomez, Hyunchae Chun, Sujan Rajbhandari, Pavlos Manousiadis, Dimali Vithanage, Grahame Faulkner, Graham Turnbull, Ifor D. Samuel, Stephen Collins, Dominic O'Brien

Proceedings Volume 10128, 101280L (2017) https://doi.org/10.1117/12.2252355

KEYWORDS: Modulation, Solar concentrators, Receivers, Visible radiation, Wireless communications, Compound parabolic concentrators, Optical communications, Sensors, Transmitters, Eye

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SPIE Journal Paper | 12 October 2015 Open Access

Open Access

The role of photonics in energy

Zakya Kafafi, Raúl Martín-Palma, Ana Nogueira, Deirdre O’Carroll, Jeremy Pietron, Ifor D. Samuel, Franky So, Nelson Tansu, Loucas Tsakalakos

JPE, Vol. 5, Issue 01, 050997, (October 2015) https://doi.org/10.1117/12.10.1117/1.JPE.5.050997

KEYWORDS: Solar cells, Solar energy, Photonics, Organic light emitting diodes, Semiconductors, Electrons, Light emitting diodes, Silicon, Photons, Thin films

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SPIE Journal Paper | 12 June 2015 Open Access

Open Access

Organic solar cells based on acceptor-functionalized diketopyrrolopyrrole derivatives

Sanjay S. Ghosh, Luis Serrano, Bernd Ebenhoch, Vincent Rotello, Graeme Cooke, Ifor D. Samuel

JPE, Vol. 5, Issue 01, 057215, (June 2015) https://doi.org/10.1117/12.10.1117/1.JPE.5.057215

KEYWORDS: Solar cells, Annealing, Organic photovoltaics, Absorption, Magnesium, Atomic force microscopy, Electrodes, Resistance, Molecules, External quantum efficiency

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Proceedings Article | 29 March 2013 Paper

Paper

Formation of quantum dots from precursors in polymeric films by ps-laser

G. Račiukaitis, P. Gečys, F. Antolini, L. Stroea, A. Bansal, I. D. Samuel, S. Allard, U. Scherf, L. Ortolani

Proceedings Volume 8607, 860702 (2013) https://doi.org/10.1117/12.2004086

KEYWORDS: Polymers, Luminescence, Transmission electron microscopy, Polymer thin films, Cadmium sulfide, Laser irradiation, Composites, Quantum dots, Laser therapeutics, Picosecond phenomena

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Proceedings Article | 13 September 2012 Paper

Paper

Nanoimprinted resonators for polymer lasers pumped by light-emitting diodes

Graham Turnbull, Georgios Tsiminis, Yue Wang, Alexander Kanibolotsky, Peter Skabara, Ifor Samuel

Proceedings Volume 8476, 847611 (2012) https://doi.org/10.1117/12.928494

KEYWORDS: Polymers, Resonators, Semiconductor lasers, Laser damage threshold, Light emitting diodes, Laser resonators, Nanolithography, Silicon, Photonic crystals, Nanostructuring

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Proceedings Article | 13 September 2012 Paper

Paper

Strongly modified angular dependence of emission from OLEDs

Shuyu Zhang, Graham Turnbull, Ifor Samuel

Proceedings Volume 8476, 847615 (2012) https://doi.org/10.1117/12.931576

KEYWORDS: Organic light emitting diodes, Europium, Surface plasmons, Optical microcavities, Nanoimprint lithography, External quantum efficiency, Electroluminescence, Light scattering, Scattering, Waveguide modes

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Proceedings Article | 17 September 2011 Paper

Paper

Conjugated polymer sensors for explosive vapor detection

Yue Wang, Graham Turnbull, Ifor D. Samuel

Proceedings Volume 8118, 81180E (2011) https://doi.org/10.1117/12.894413

KEYWORDS: Luminescence, Explosives, Polymers, Sensors, Nitrogen, Explosives detection, Polymeric sensors, Quenching (fluorescence), Signal detection, Molecules

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Proceedings Article | 21 August 2009 Paper

Paper

Hybrid organic-inorganic POSS dendritic materials: photoluminescence chromophore control via confinement and steric hindrance

P. André, G. Cheng, A. Ruseckas, D. Cole-Hamilton, I. D. Samuel

Proceedings Volume 7396, 73960B (2009) https://doi.org/10.1117/12.826220

KEYWORDS: Luminescence, Dendrimers, Chromophores, Silicon, Quantum efficiency, Absorbance, Temperature metrology, Molecules, Nitrogen, Chemistry

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Proceedings Article | 2 September 2008 Paper

Paper

Light-emitting diode pumped polymer lasers

G. Turnbull, Y. Yang, P. Shaw, A. Ruseckas, I. D. Samuel

Proceedings Volume 7051, 70511E (2008) https://doi.org/10.1117/12.795883

KEYWORDS: Polymers, Light emitting diodes, Semiconductor lasers, Organic light emitting diodes, Pulsed laser operation, Polymer thin films, Laser damage threshold, Semiconductors, Laser resonators, Indium gallium nitride

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Proceedings Article | 2 September 2008 Paper

Paper

Light-emitting poly(dendrimer)s

Jack Gunning, Kevin Knights, Jean-Charles Ribierre, Ruth Harding, Jack Levell, Paul Burn, Ifor D. W. Samuel

Proceedings Volume 7051, 70511X (2008) https://doi.org/10.1117/12.800083

KEYWORDS: Dendrimers, Polymers, Polymerization, Magnesium, Chromatography, Organic light emitting diodes, Inkjet technology, Printing, Luminescence, Absorption

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Proceedings Article | 1 May 2008 Paper

Paper

An organic semiconductor laser on silicon

A. Vasdekis, S. Moore, A. Ruseckas, T. Krauss, I. Samuel, G. Turnbull

Proceedings Volume 6996, 699606 (2008) https://doi.org/10.1117/12.786541

KEYWORDS: Silicon, Semiconductor lasers, Polymers, Mirrors, Organic semiconductors, Resonators, Hybrid silicon lasers, Silica, Reflectivity, Laser damage threshold

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Proceedings Article | 16 October 2007 Paper

Paper

Diode-pumped polymer lasers

G. A. Turnbull, A. E. Vasdekis, G. Tsiminis, I. D. W. Samuel

Proceedings Volume 6655, 66550W (2007) https://doi.org/10.1117/12.735987

KEYWORDS: Polymers, Semiconductor lasers, Mirrors, Absorption, Laser damage threshold, Energy transfer, Diodes, Resonators, Polymer thin films, Luminescence

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Proceedings Article | 26 September 2007 Paper

Paper

Shrinking polymer lasers

I.D.W. Samuel, A. Vasdekis, G. Tsiminis, G. Turnbull, E. Taylor

Proceedings Volume 6713, 671304 (2007) https://doi.org/10.1117/12.735712

KEYWORDS: Polymers, Semiconductor lasers, Semiconductors, Mirrors, Absorption, Luminescence, Polymer thin films, Laser damage threshold, Energy transfer, Photonics

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Proceedings Article | 5 December 2006 Paper

Paper

Phosphorescent iridium(III) cored dendrimers for light-emitting displays

J.-C. Ribierre, S. Staton, P. Burn, I. Samuel

Proceedings Volume 6333, 63330H (2006) https://doi.org/10.1117/12.683380

KEYWORDS: Dendrimers, Excitons, Diffusion, Organic light emitting diodes, Luminescence, Absorption, External quantum efficiency, Molecules, Light emitting diodes, Polymers

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Proceedings Article | 15 November 2006 Paper

Paper

Exciton annihilation and diffusion in semiconducting polymers

P. Shaw, A. Lewis, A. Ruseckas, I. Samuel

Proceedings Volume 6334, 63340G (2006) https://doi.org/10.1117/12.681573

KEYWORDS: Diffusion, Excitons, Polymers, Annealing, Absorbance, Picosecond phenomena, Luminescence, Semiconductors, Organic photovoltaics, Solar cells

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Proceedings Article | 10 October 2005 Paper

Paper

Highly branched phosphorescent dendrimers

Neil Cumpstey, Raghu Bera, Ruth Harding, Paul Burn, Ifor D. Samuel

Proceedings Volume 5937, 593725 (2005) https://doi.org/10.1117/12.620443

KEYWORDS: Dendrimers, Argon, Magnesium, Luminescence, Absorption, Solid state physics, Chromatography, Quantum efficiency, Chromophores, Oxidation

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Proceedings Article | 9 October 2005 Paper

Paper

Novel diffractive feedback structures for semiconducting polymer lasers

A. Vasdekis, G. Turnbull, I. D. Samuel, G. Town

Proceedings Volume 5937, 59371O (2005) https://doi.org/10.1117/12.616863

KEYWORDS: Polymers, Laser damage threshold, Semiconductors, Semiconductor lasers, Diffraction gratings, Diffraction, Modulation, Scattering, Resonators, Modes of laser operation

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Proceedings Article | 8 October 2005 Paper

Paper

Semiconducting polymer optical amplifiers

M. Goosens, G. Heliotis, G. Turnbull, A. Ruseckas, J. Lawrence, R. Xia, D. D. Bradley, Ifor D. Samuel

Proceedings Volume 5937, 593706 (2005) https://doi.org/10.1117/12.624672

KEYWORDS: Optical amplifiers, Polymers, Semiconductors, Solid state electronics, Organic semiconductors, Absorption, Luminescence, Laser beam diagnostics, Optical semiconductors, Optical fibers

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Proceedings Article | 16 February 2004 Paper

Paper

Conjugated dendrimers: a modular approach to materials for full-color displays

Jonathan Markham, Thomas Anthopoulos, Ebinazar Namdas, Shih-Chun Lo, Gary Richards, Michael Frampton, Oleg Salata, Paul Burn, Ifor Samuel

Proceedings Volume 5214, (2004) https://doi.org/10.1117/12.512062

KEYWORDS: Dendrimers, Light emitting diodes, Electroluminescence, Polymers, Organic light emitting diodes, Luminous efficiency, Chromophores, Molecules, Eye, External quantum efficiency

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Proceedings Article | 17 September 2002 Paper

Paper

Efficient solution-processed dendrimer OLEDs

Oleg Salata, Zugang Liu, Alexei Safonov, Nazir Mustapha, Shih-Chun Lo, Paul Burn, Ifor Samuel, Jonathan Markham

Proceedings Volume 4918, (2002) https://doi.org/10.1117/12.483063

KEYWORDS: Dendrimers, Organic light emitting diodes, Polymers, Molecules, Electro optics, Coating, Optical lithography, Energy efficiency, Interfaces, Physics

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Proceedings Article | 13 June 2002 Paper

Paper

Photonic band structure and emission characteristics of a metal-backed polymeric distributed feedback laser

Piers Andrew, Graham Turnbull, William Barnes, Ifor Samuel

Proceedings Volume 4642, (2002) https://doi.org/10.1117/12.470440

KEYWORDS: Polymers, Reflectivity, Luminescence, Silver, Metals, Scattering, Laser damage threshold, Waveguide modes, Organic light emitting diodes, Light emitting diodes

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Proceedings Article | 2 February 2001 Paper

Paper

Electroluminescent devices incorporating a new oxadiazole derivative

Gun-Young Jung, Changsheng Wang, Christopher Pearson, Martin Bryce, Ifor Samuel, Michael Petty

Proceedings Volume 4105, (2001) https://doi.org/10.1117/12.416909

KEYWORDS: Electroluminescence, Aluminum, Electrodes, Light emitting diodes, Electron transport, Quantum efficiency, Interfaces, Copper, Information operations, Metals

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Proceedings Article | 17 December 1999 Paper

Paper

Effect of generation on the electronic properties of light-emitting dendrimers

Paul Burn, Mounir Halim, Jonathan Pillow, Ifor Samuel

Proceedings Volume 3797, (1999) https://doi.org/10.1117/12.372741

KEYWORDS: Dendrimers, Light emitting diodes, Electrodes, Solid state physics, Luminescence, Thin films, External quantum efficiency, Chromatography, Electron transport, Polymers

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Proceedings Article | 17 December 1999 Paper

Paper

Photoluminescence studies of the light-emitting species in new materials for polymer devices

Garry Rumbles, P. Miller, M. deSouza, I. Gould, H. Amer, D. Russell, Andrew Holmes, Stephen Moratti, Ifor Samuel

Proceedings Volume 3797, (1999) https://doi.org/10.1117/12.372701

KEYWORDS: Polymers, Absorption, Thin films, Polymer thin films, Luminescence, Quantum efficiency, Data modeling, Chemistry, Spectroscopy, Dielectrics

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Proceedings Article | 17 December 1999 Paper

Paper

Device model for polymer light-emitting diodes: effect of temperature and oxidation

John Lupton, Ifor Samuel

Proceedings Volume 3797, (1999) https://doi.org/10.1117/12.372728

KEYWORDS: Instrument modeling, Polymers, Temperature metrology, Absorption, Organic light emitting diodes, Light emitting diodes, Aluminum, Indium, Tin, Oxidation

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Proceedings Article | 1 December 1997 Paper

Paper

Polypyridine as an efficient electron-transporting polymer for light-emitting diodes

Stuart Dailey, Mounir Halim, Eymard Rebourt, Ifor Samuel, Andrew Monkman

Proceedings Volume 3148, (1997) https://doi.org/10.1117/12.284170

KEYWORDS: Polymers, Light emitting diodes, Diodes, Organic light emitting diodes, Electrons, Aluminum, Electroluminescence, External quantum efficiency, Electrodes, Calcium

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Proceedings Article | 1 December 1997 Paper

Paper

Photophysical characterization of poly(p-pyridine)

Andrew Monkman, Mounir Halim, Stuart Dailey, Ifor Samuel, M. Sluch, L. Horsburgh

Proceedings Volume 3145, (1997) https://doi.org/10.1117/12.284154

KEYWORDS: Absorption, Polymers, Solid state physics, Light emitting diodes, Luminescence, Electroluminescence, Thin films, Quantum efficiency, Nitrogen, Excimers

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Proceedings Article | 1 December 1997 Paper

Paper

Photoluminescence in poly(3-hexylthiophene)

Ifor Samuel, Laura Magnani, Garry Rumbles, Ken Murray, Bradley Stone, Stephen Moratti, Andrew Holmes

Proceedings Volume 3145, (1997) https://doi.org/10.1117/12.279277

KEYWORDS: Quantum efficiency, Polymers, Absorption, Thin films, Luminescence, Picosecond phenomena, Excitons, Molecules, Excimers, Polymer thin films

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Showing 5 of 43 publications

Proceedings Volume Editor (3)

SPIE Conference Volume | 28 November 2016

Organic Photovoltaics XVII

SPIE Conference Volume | 27 October 2015

Organic Photovoltaics XVI

SPIE Conference Volume | 5 November 2014

Organic Photovoltaics XV

Conference Committee Involvement (71)

Organic and Hybrid Sensors and Bioelectronics XVIII

3 August 2025 | San Diego, California, United States

Organic and Hybrid Light Emitting Materials and Devices XXIX

3 August 2025 | San Diego, California, United States

Organic, Hybrid, and Perovskite Photovoltaics XXVI

3 August 2025 | San Diego, California, United States

Organic Photonics + Electronics

3 August 2025 | San Diego, United States

Ultra-High-Definition Imaging Systems VIII

29 January 2025 | San Francisco, California, United States

Advanced Materials, Biomaterials, and Manufacturing Technologies for Security and Defence II

18 September 2024 | Edinburgh, United Kingdom

Organic, Hybrid, and Perovskite Photovoltaics XXV

20 August 2024 | San Diego, California, United States

Organic and Hybrid Sensors and Bioelectronics XVII

19 August 2024 | San Diego, California, United States

Organic Photonics + Electronics

18 August 2024 | San Diego, United States

Organic and Hybrid Light Emitting Materials and Devices XXVIII

18 August 2024 | San Diego, California, United States

Ultra-High-Definition Imaging Systems VII

29 January 2024 | San Francisco, California, United States

Advanced Materials, Biomaterials, and Manufacturing Technologies for Security and Defence

3 September 2023 | Amsterdam, Netherlands

Organic, Hybrid, and Perovskite Photovoltaics XXIV

22 August 2023 | San Diego, California, United States

Organic and Hybrid Light Emitting Materials and Devices XXVII

21 August 2023 | San Diego, California, United States

Organic and Hybrid Sensors and Bioelectronics XVI

20 August 2023 | San Diego, California, United States

SPIE Organic Photonics + Electronics

20 August 2023 | San Diego, United States

Ultra-High-Definition Imaging Systems VI

1 February 2023 | San Francisco, California, United States

Organic, Hybrid, and Perovskite Photovoltaics XXIII

23 August 2022 | San Diego, California, United States

SPIE Organic Photonics + Electronics

21 August 2022 | San Diego, United States

Organic and Hybrid Light Emitting Materials and Devices XXVI

21 August 2022 | San Diego, California, United States

Organic and Hybrid Sensors and Bioelectronics XV

21 August 2022 | San Diego, California, United States

Ultra-High-Definition Imaging Systems V

21 February 2022 | San Francisco, California, United States

Organic, Hybrid, and Perovskite Photovoltaics XXII

3 August 2021 | San Diego, California, United States

Organic and Hybrid Light Emitting Materials and Devices XXV

2 August 2021 | San Diego, California, United States

Organic and Hybrid Sensors and Bioelectronics XIV

1 August 2021 | San Diego, California, United States

SPIE Organic Photonics + Electronics

1 August 2021 | San Diego, United States

Ultra-High-Definition Imaging Systems IV

6 March 2021 | Online Only, California, United States

Organic, Hybrid, and Perovskite Photovoltaics XXI

24 August 2020 | Online Only, California, United States

Organic and Hybrid Light Emitting Materials and Devices XXIV

24 August 2020 | Online Only, California, United States

Organic and Hybrid Sensors and Bioelectronics XIII

24 August 2020 | Online Only, California, United States

SPIE Organic Photonics + Electronics

24 August 2020 | Online Only, United States

Ultra-High-Definition Imaging Systems III

3 February 2020 | San Francisco, California, United States

Optical Materials and Biomaterials in Security and Defence Systems Technology XVI

12 September 2019 | Strasbourg, France

Organic, Hybrid, and Perovskite Photovoltaics XX

13 August 2019 | San Diego, California, United States

Organic and Hybrid Sensors and Bioelectronics XII

11 August 2019 | San Diego, California, United States

Organic and Hybrid Light Emitting Materials and Devices XXIII

11 August 2019 | San Diego, California, United States

SPIE Organic Photonics + Electronics

11 August 2019 | San Diego, United States

Ultra-High-Definition Imaging Systems II

2 February 2019 | San Francisco, California, United States

Optical Materials and Biomaterials in Security and Defence Systems Technology

10 September 2018 | Berlin, Germany

Organic, Hybrid, and Perovskite Photovoltaics XIX

20 August 2018 | San Diego, California, United States

Organic and Hybrid Sensors and Bioelectronics XI

19 August 2018 | San Diego, California, United States

Organic Light Emitting Materials and Devices XXII

19 August 2018 | San Diego, California, United States

SPIE Organic Photonics + Electronics

19 August 2018 | San Diego, United States

Ultra-High-Definition Imaging Systems

31 January 2018 | San Francisco, California, United States

Optical Materials and Biomaterials in Security and Defence Systems Technology

11 September 2017 | Warsaw, Poland

Organic, Hybrid, and Perovskite Photovoltaics XVIII

6 August 2017 | San Diego, California, United States

Organic Sensors and Bioelectronics X

6 August 2017 | San Diego, California, United States

Organic Light Emitting Materials and Devices XXI

6 August 2017 | San Diego, California, United States

SPIE Organic Photonics + Electronics

6 August 2017 | San Diego, United States

Optical Materials and Biomaterials in Security and Defence Systems Technology

28 September 2016 | Edinburgh, United Kingdom

Organic Photovoltaics XVII

30 August 2016 | San Diego, California, United States

Organic Light Emitting Materials and Devices XX

28 August 2016 | San Diego, California, United States

Organic Sensors and Bioelectronics IX

28 August 2016 | San Diego, California, United States

Organic Photovoltaics XVI

11 August 2015 | San Diego, California, United States

Organic Sensors and Bioelectronics VIII

9 August 2015 | San Diego, California, United States

Organic Light Emitting Materials and Devices XIX

9 August 2015 | San Diego, California, United States

Organic Semiconductors in Sensors and Bioelectronics VII

19 August 2014 | San Diego, California, United States

Organic Photovoltaics XV

19 August 2014 | San Diego, California, United States

Organic Light Emitting Materials and Devices XVIII

17 August 2014 | San Diego, California, United States

Organic Semiconductors in Sensors and Bioelectronics VI

28 August 2013 | San Diego, California, United States

Organic Photovoltaics XIV

27 August 2013 | San Diego, California, United States

Organic Light Emitting Materials and Devices XVII

25 August 2013 | San Diego, California, United States

Organic Photovoltaics XIII

14 August 2012 | San Diego, California, United States

Organic Light Emitting Materials and Devices XVI

12 August 2012 | San Diego, California, United States

Organic Light Emitting Materials and Devices XV

21 August 2011 | San Diego, California, United States

Organic Light Emitting Materials and Devices XIV

1 August 2010 | San Diego, California, United States

Organic Light Emitting Materials and Devices XIII

2 August 2009 | San Diego, California, United States

Organic Light Emitting Materials and Devices XII

10 August 2008 | San Diego, California, United States

Organic Light Emitting Materials and Devices XI

27 August 2007 | San Diego, California, United States

Organic Light Emitting Materials and Devices X

13 August 2006 | San Diego, California, United States

Organic Light-Emitting Materials and Devices IX

31 July 2005 | San Diego, California, United States

Showing 5 of 71 Conference Committees

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