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HL: Fachverband Halbleiterphysik
HL 50: Perovskite and photovoltaics IV (joint session HL/CPP)
HL 50.5: Vortrag
Mittwoch, 18. März 2020, 16:30–16:45, POT 251
Study of photon recycling in perovskite optoelectronics — •Changsoon Cho1,2,3,4, Baodan Zhao1, Gregory Tainter1, Frederik Nehm2, Karl Leo2, Jung-Yong Lee3, Richard Friend1, Dawei Di1,4, Felix Deschler1, and Neil Greenham1 — 1Cavendish Laboratory, Department of Physics, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, UK — 2Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Technische Universität Dresden, Dresden 01187, Germany — 3School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea — 4State Key Laboratory of Morden Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
Photon recycling (PR), consisting of successive light re-absorption and re-emission processes, is a key mechanism to understand the distinct optical properties of perovskite light-emitting diodes (PeLEDs). Here we verify the existence of PR effect via the measurement of spatially-resolved photoluminescence (PL) and electroluminescence (EL). To quantify the PR effect in PeLEDs, we propose an optical modelling method taking photon re-absorption and re-emission into account. According to the optical analysis of currently reported state-of-the-art devices, PR is shown to be able to contribute to more than 70% of the EQEs. Finally, we introduce various optical designs of PeLEDs, to maximize PR effect and enhance the quantity and property of light emission.