Dresden 2017 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: Poster: Organic Electronics and Photovoltaics, Molecular Excitations
CPP 50.25: Poster
Mittwoch, 22. März 2017, 18:30–21:00, P3
Coupling of organic light emitting diode emission to planar waveguides — •Toni Bärschneider1, Simonas Krotkus2, Simone Lenk1, Sebastian Reinecke1, and Karl Leo1 — 1Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, Technische Universität Dresden, Germany — 2School of Physics and Astronomy, St Andrews, United Kingdom
Organic light-emitting diodes (OLEDs) are cheap, bright, and easy-to-fabricate light sources which can be deposited on arbitrary substrates. For these reasons, successful OLED integration on the planar waveguide structure is advantageous for a wide range of applications, including point-of-care sensing and optical circuits. However, due to the optical absorption of the electrodes, efficient coupling of OLED emission into the thin waveguide core lying beneath is one of the major challenges. One promising approach is to make use of evanescent coupling, which relies on the overlap between emission and waveguide mode. However, there are number of possible improvements in efficiency and composition of light. Here especially, one targets blue light emission for compatibility with common analytes as well as light that is TM polarized. In this work, we investigate the waveguide coupling of a blue OLED to a 70 nm TiO2 layer. A p-i-n device design enables optical optimization guided by numerical calculations, while the use of the thin metal electrode is shown to be beneficial for an efficient light incoupling. A highly transparent, easy and effective ALD encapsulation is used to carry out measurements under ambient conditions.