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84% efficiency improvement in all-inorganic perovskite light-emitting diodes assisted by a phosphorescent material.

ABSTRACT: A novel mixed perovskite emitter layer is applied to design all-inorganic cesium lead halide perovskite light-emitting diodes (PeLEDs) with high electroluminescence (EL) performance, by combining CsPbBr₃ with iridium(iii)bis[2-(4',6'-difluorophenyl)pyridinato-N,C²']-picolinate (FIrpic), where FIrpic is a phosphorescent material with very high internal quantum efficiency (IQE) approaching 100%. The CsPbBr₃:FIrpic PeLEDs show a maximum luminance of 5486 cd m^-2, and an external quantum efficiency of 0.47%, which are 1.84 and 1.76 times that of neat CsPbBr₃ PeLEDs, respectively. It is found that FIrpic molecules as an assistant dopant can efficiently transmit energy from the excitons of FIrpic to the excited state of the CsPbBr₃ emitter via a Förster energy transfer process, leading to enhanced EL efficiency in the CsPbBr₃:FIrpic PeLEDs.

SUBMITTER: Gao CH

PROVIDER: S-EPMC9080124 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature

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84% efficiency improvement in all-inorganic perovskite light-emitting diodes assisted by a phosphorescent material.

Gao Chun-Hong CH Ma Xing-Juan XJ Zhang Yue Y Yu Fu-Xing FX Xiong Zi-Yang ZY Wang Zhi-Qiang ZQ Wang Run R Jia Ya-Lan YL Zhou Dong-Ying DY Xiong Zu-Hong ZH

RSC advances 20180426 28

A novel mixed perovskite emitter layer is applied to design all-inorganic cesium lead halide perovskite light-emitting diodes (PeLEDs) with high electroluminescence (EL) performance, by combining CsPbBr3 with iridium(iii)bis[2-(4',6'-difluorophenyl)pyridinato-N,C2']-picolinate (FIrpic), where FIrpic is a phosphorescent material with very high internal quantum efficiency (IQE) approaching 100%. The CsPbBr3:FIrpic PeLEDs show a maximum luminance of 5486 cd m-2 ...[more]

PMID: 35539492

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