期刊
ADVANCED MATERIALS
卷 32, 期 25, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202000752
关键词
device stability; efficiency roll-off; organic-inorganic hybrid perovskites; perovskite light-emitting devices; thermal management
类别
资金
- Air Force Office of Scientific Research [FA9550-18-1-0037]
- National Science Foundation [DMR-1807797]
- United States-India Educational Foundation (USIEF, India) [2266/FNPDR/2017]
- Institute of International Education (IIE, USA) [2266/FNPDR/2017]
- Princeton Center for Complex Materials, a National Science Foundation (NSF)-MRSEC program [DMR-1420541]
The performance of lead-halide perovskite light-emitting diodes (LEDs) has increased rapidly in recent years. However, most reports feature devices operated at relatively small current densities (<500 mA cm(-2)) with moderate radiance (<400 W sr(-1) m(-2)). Here, Joule heating and inefficient thermal dissipation are shown to be major obstacles toward high radiance and long lifetime. Several thermal management strategies are proposed in this work, such as doping charge-transport layers, optimizing device geometry, and attaching heat spreaders and sinks. Combining these strategies, high-performance perovskite LEDs are demonstrated with maximum radiance of 2555 W sr(-1) m(-2), peak external quantum efficiency (EQE) of 17%, considerably reduced EQE roll-off (EQE > 10% to current densities as high as 2000 mA cm(-2)), and tenfold increase in operational lifetime (when driven at 100 mA cm(-2)). Furthermore, with proper thermal management, a maximum current density of 2.5 kA cm(-2) and an EQE of approximate to 1% at 1 kA cm(-2) are shown using electrical pulses, which represents an important milestone toward electrically driven perovskite lasers.
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