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High‐Efficiency Perovskite Light‐Emitting Diodes with Synergetic Outcoupling Enhancement
Author(s) -
Shen Yang,
Cheng LiPeng,
Li YanQing,
Li Wei,
Chen JingDe,
Lee ShuitTong,
Tang JianXin
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201901517
Subject(s) - materials science , light emitting diode , optoelectronics , quantum efficiency , perovskite (structure) , diode , energy conversion efficiency , engineering , chemical engineering
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 (CsPbBr 3 ) 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.