期刊
ADVANCED MATERIALS
卷 31, 期 24, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201901517
关键词
CsPbBr3; light outcoupling; moth-eye nanostructures; perovskite light-emitting diodes
类别
资金
- National Natural Science Foundation of China [61520106012, 61722404, 51873138, 91633301]
- National Key R&D Program of China [2016YFB0401002, 2016YFB0400700]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Perovskite light-emitting diodes (PeLEDs) show great application potential in high-quality flat-panel displays and solid-state lighting due to their steadily improved efficiency, tunable colors, narrow emission peak, and easy solution-processing capability. However, because of high optical confinement and nonradiative charge recombination during electron-photon conversion, the highest reported efficiency of PeLEDs remains far behind that of their conventional counterparts, such as inorganic LEDs, organic LEDs, and quantum-dot LEDs. Here a facile route is demonstrated by adopting bioinspired moth-eye nanostructures at the front electrode/perovskite interface to enhance the outcoupling efficiency of waveguided light in PeLEDs. As a result, the maximum external quantum efficiency and current efficiency of the modified cesium lead bromide (CsPbBr3) green-emitting PeLEDs are improved to 20.3% and 61.9 cd A(-1), while retaining spectral and angular independence. Further reducing light loss in the substrate mode using a half-ball lens, efficiencies of 28.2% and 88.7 cd A(-1) are achieved, which represent the highest values reported to date for PeLEDs. These results represent a substantial step toward achieving practical applications of PeLEDs.
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