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Stable Yellow Light-Emitting Devices Based on Ternary Copper Halides with Broadband Emissive Self-Trapped Excitons
journal contribution
posted on 2020-03-16, 20:43 authored by Zhuangzhuang Ma, Zhifeng Shi, ChaoChao Qin, Minghuan Cui, Dongwen Yang, Xinjiang Wang, Lintao Wang, Xinzhen Ji, Xu Chen, Junlu Sun, Di Wu, Yu Zhang, Xin Jian Li, Lijun Zhang, Chongxin ShanGreat
successes have been achieved in developing perovskite light-emitting
devices (LEDs) with blue, green, red, and near-infrared emissions.
However, as key optoelectronic devices, yellow-colored perovskite
LEDs remain challenging, mainly due to the inevitable halide separation
in mixed halide perovskites under high bias, causing undesired color
change of devices. In addition to this color-missing problem, the
intrinsic toxicity and poor stability of conventional lead-halide
perovskites also restrict their practical applications. We herein
report the fabrication of stable yellow LEDs based on a ternary copper
halide CsCu2I3, addressing the color instability
and toxicity issues facing current perovskite yellow LED’s
compromise. Joint experiment–theory characterizations indicate
that the yellow electroluminescence originates from the broadband
emission of self-trapped excitons centered at 550 nm as well as the
comparable and reasonably low carrier effective masses favorable for
charge transport. With a maximum luminance of 47.5 cd/m2 and an external quantum efficiency of 0.17%, the fabricated yellow
LEDs exhibit a long half-lifetime of 5.2 h at 25 °C and still
function properly at 60 °C with a half-lifetime of 2.2 h, which
benefits from the superior resistance of CsCu2I3 to heat, moisture, and oxidation in ambient environmental conditions.
The results obtained promise the copper halides with broadband light
emission as an environment-friendly and stable yellow emitter for
the LEDs compatible with practical applications.
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Keywords
broadband emissionCsCu 2color-missing problemyellow-colored perovskite LEDslead-halide perovskitesternary copper halide CsCu 22.2 hcopper halides550 nmhalide perovskitestoxicity issuesquantum efficiencyself-trapped excitonsundesired color changebroadband light emissionnear-infrared emissionscharge transportTernary Copper Halidesperovskite light-emitting devices5.2 hStable Yellow Light-Emitting DevicesLEDs exhibitBroadband Emissive Self-Trapped Excitons Great successescolor instabilityhalide separationoptoelectronic devices
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