Mr. Stefan Bachevillier Profile

Stefan Bachevillier

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Proceedings Article | 7 November 2016 Presentation

Tunable high-refractive index hybrid for solution-processed light management devices (Conference Presentation)

Stefan Bachevillier

Proceedings Volume 9949, 99490F (2016) https://doi.org/10.1117/12.2236953

KEYWORDS: Polymers, Refractive index, Waveguides, Titanium, Oxides, Nanoparticles, Nanocomposites, Photonic devices, Distributed Bragg reflectors, Antireflective coatings

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After the use of highly efficient but expensive inorganic optical materials, solution-processable polymers and hybrids have drawn more and more interest. Our group have recently developed a novel polymer-based hybrid optical material from titanium oxide hydrate exhibiting an outstanding set of optical and material properties. Firstly, their low cost, processability and cross-linked states are particularly attractive for many applications. Moreover, a high refractive index can be repeatedly achieved while optical losses stays considerably low over the entire visible and near-infrared wavelength regime. Indeed, the formation of inorganic nanoparticles, usually present in nanocomposites, is avoided by a specific formulation process. Even more remarkably, the refractive index can be tuned by either changing the inorganic content, using different titanium precursors or via a low‑temperature curing process. A part of our work is focused on the reliable optical characterization of these properties, in particular a microscope-based setup allowing in-situ measurement and sample mapping has been developed. Our efforts are also concentrated on various applications of these exceptional properties. This hybrid material is tailored for photonic devices, with a specific emphasis on the production of highly efficient solution processable Distributed Bragg Reflectors (DBR) and anti-reflection coatings. Furthermore, waveguides can be fabricated from thin films along with in-coupling and out-coupling structures. These light managements structures are particularly adapted to organic photovoltaic cells (OPVs) and light emitting diodes (OLEDs).

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