Regensburg 2016 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 53: Postersession DS/HL
DS 53.36: Poster
Donnerstag, 10. März 2016, 16:00–19:00, Poster A
Tailoring Bragg-gratings for light outcoupling of red top-emitting organic light-emitting diodes — •Paul-Anton Will1, Cornelius Fuchs1, Frank Boldt2, Reinhard Scholz1, Simone Lenk1, and Sebastian Reineke1 — 1Institut für Angewandte Photophysik, Technische Universität Dresden, Germany — 2Institut für Physik, Technische Universität Chemnitz, Germany
Introducing Bragg-gratings into OLED structures is a promising approach to increase the overall device efficiency. Here, scattering effects lead to a redistribution of internal modes, i.e. wave guided and/or surface plasmon polariton modes, with the benefit of an increased out-coupled mode fraction [1]. The overall emission characteristics of a device depend on the OLED properties like emitter spectrum, device layout, and optical micro cavity order, and also strongly on the shape, period, and height of the incorporated grating structure. We present a detailed analysis of the influence of one dimensional gratings on the emission of various red top-emitting OLEDs by using optical thin film simulations quantifying the emission from periodically perturbated optical micro cavities. AFM measurements of nanoimprinted Bragg-gratings serve as input for the optical simulations. This facilitates the comparison with experimental results from manufactured devices leading to first hints for optimal grating periods in relation to the vertical aspect ratios of the grating structure. Once the optimal parameters are found, the use of Bragg-gratings pose a cheap and up-scalable method to improve the OLED efficiency.
[1] T. Schwab et al., Opt. Express 22, 7524-37, (2014)