Electroluminescence in light-emitting devices relies on the encounter and radiative recombination of electrons and holes in the emissive layer. In organometal halide perovskite light-emitting diodes, poor film formation creates electrical shunting paths, where injected charge carriers bypass the perovskite emitter, leading to a loss in electroluminescence yield. Here, we report a solution-processing method to block electrical shunts and thereby enhance electroluminescence quantum efficiency in perovskite devices. In this method, a blend of perovskite and a polyimide precursor dielectric (PIP) is solution-deposited to form perovskite nanocrystals in a thin-film matrix of PIP. The PIP forms a pinhole-free charge-blocking layer, while still allowing the embedded perovskite crystals to form electrical contact with the electron and hole-injection layers. This modified structure reduces nonradiative current losses and improves quantum efficiency by 2 orders of magnitude, giving an external quantum efficiency of 1.2%. This simple technique provides an alternative route to circumvent film formation problems in perovskite optoelectronics and offers the possibility of flexible and high-performance light-emitting displays.
机构:
Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Chen, Qi
;
Zhou, Huanping
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Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Zhou, Huanping
;
Hong, Ziruo
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Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Hong, Ziruo
;
Luo, Song
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Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Luo, Song
;
Duan, Hsin-Sheng
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Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Duan, Hsin-Sheng
;
Wang, Hsin-Hua
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Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Wang, Hsin-Hua
;
Liu, Yongsheng
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机构:
Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Liu, Yongsheng
;
Li, Gang
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Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Li, Gang
;
Yang, Yang
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机构:
Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
机构:
Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Chen, Qi
;
Zhou, Huanping
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h-index: 0
机构:
Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Zhou, Huanping
;
Hong, Ziruo
论文数: 0引用数: 0
h-index: 0
机构:
Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Hong, Ziruo
;
Luo, Song
论文数: 0引用数: 0
h-index: 0
机构:
Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Luo, Song
;
Duan, Hsin-Sheng
论文数: 0引用数: 0
h-index: 0
机构:
Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Duan, Hsin-Sheng
;
Wang, Hsin-Hua
论文数: 0引用数: 0
h-index: 0
机构:
Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Wang, Hsin-Hua
;
Liu, Yongsheng
论文数: 0引用数: 0
h-index: 0
机构:
Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Liu, Yongsheng
;
Li, Gang
论文数: 0引用数: 0
h-index: 0
机构:
Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Li, Gang
;
Yang, Yang
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h-index: 0
机构:
Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA