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27 September 2013 All solution processed blue multi-layer light emitting diodes realized by thermal layer stabilization and orthogonal solvent processing
Sebastian Nau, Roman Trattnig, Leonid Pevzner, Monika Jäger, Raphael Schlesinger, Marco V. Nardi, Giovanni Ligorio, Christos Christodoulou, Niels Schulte, Stefanie Winkler, Johannes Frisch, Antje Vollmer, Martin Baumgarten, Stefan Sax, Norbert Koch, Klaus Müllen, Emil J. W. List-Kratochvil
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Proceedings Volume 8829, Organic Light Emitting Materials and Devices XVII; 88290Z (2013) https://doi.org/10.1117/12.2024146
Event: SPIE Organic Photonics + Electronics, 2013, San Diego, California, United States
Abstract
Herein we report on the fabrication and the properties of two highly efficient blue light emitting multilayer polymer light emitting diodes (PLEDs). The first device structure combines a thermally stabilized polymer with a material processed from an orthogonal solvent, allowing for the fabrication of a triple layer structure from solution. The well known poly(9,9-dioctyl-fluorene-co-N-(4-butylphenyl)-diphenylamine) (TFB), which can be stabilized in a bake-out procedure, was used as a hole transporting layer. A novel pyrene – triphenylamine (PPyrTPA) copolymer was used as emissive layer. The stack was finalized by a poly(fluorene) - derivative with polar side-chains, therefore being soluble in a polar solvent which allows for the deposition onto PPyrTPA without redissolving. The resulting PLED showed bright-blue electroluminescence (CIE1931 coordinates x=0.163; y=0.216) with a high efficiency of 1.42 cd/A and a peak luminescence of 16500 cd/m². The second presented device configuration comprises a thermally stabilized indenofluorene – triphenylamine copolymer acting as hole transporter, and an emissive copolymer with building blocks specifically designed for blue light emission, effective charge carrier injection and transport as well as for exciton generation. This multilayer PLED led to deep-blue emission (CIE1931 x=0.144; y=0.129) with a remarkably high device efficiency of 9.7 cd/A. Additionally, atomic force microscopy was carried out to investigate the film morphology of the components of the stack and x-ray photoemission spectroscopy was performed to ensure a full coverage of the materials on top of each other. Ultraviolet photoemission spectroscopy confirmed the desired type-II band level offsets on the individual interfaces.
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Sebastian Nau, Roman Trattnig, Leonid Pevzner, Monika Jäger, Raphael Schlesinger, Marco V. Nardi, Giovanni Ligorio, Christos Christodoulou, Niels Schulte, Stefanie Winkler, Johannes Frisch, Antje Vollmer, Martin Baumgarten, Stefan Sax, Norbert Koch, Klaus Müllen, and Emil J. W. List-Kratochvil "All solution processed blue multi-layer light emitting diodes realized by thermal layer stabilization and orthogonal solvent processing", Proc. SPIE 8829, Organic Light Emitting Materials and Devices XVII, 88290Z (27 September 2013); https://doi.org/10.1117/12.2024146
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KEYWORDS
Organic light emitting diodes
Polymers
Electroluminescence
Multilayers
Interfaces
Atomic force microscopy
Luminescence
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