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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 77: Perovskite and photovoltaics IV (joint session HL/CPP)

CPP 77.5: Vortrag

Mittwoch, 18. März 2020, 16:30–16:45, POT 251

Study of photon recycling in perovskite optoelectronics — •Changsoon Cho^1,2,3,4, Baodan Zhao¹, Gregory Tainter¹, Frederik Nehm², Karl Leo², Jung-Yong Lee³, Richard Friend¹, Dawei Di^1,4, 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.