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Abstract

In recent years, metal halide perovskites have received extensive attention due to their superior optoelectronic properties and solution processability, which also become a research hotspot in the field of optoelectronics. Among all the perovskite optoelectronics applications, perovskite light-emitting diode (LED) becomes one of the important research topics because it is likely to be used in the next-generation display technique. Based on the high photoluminescence quantum yield (PLQY), facilely tunable bandgaps, and sharp emission of perovskite material, the external quantum efficiency of perovskite LED has increased from less than 1% to over 20% within only five years, showing the most rapid development speed in the LED field. During the 5-year exploration of perovskite LEDs, researchers have focused their efforts on how to realize the crystal-growth control in the perovskite film formation process, enhance PLQY of the perovskite films, and improve the performance of perovskite LEDs. Among all the approaches, the utilization of organic additives including small molecules and polymers proves to be an effective strategy. Here, in this article, we review the recent advances in metal halide perovskite LEDs based on the strategy of organic-additive treatment. We also analyze and discuss the interaction between organic additive and perovskite crystal as well as its influence on the performance of perovskite LED. In the end, we discuss the challenges remaining in perovskite LEDs and the prospects for perovskite LEDs.

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Authors and contacts

Corresponding author:Chen Zi-Ming,mszimingchen@yahoo.com; Yip Hin-Lap,msangusyip@scut.edu.cn;

Funds:Project supported by the National Key R&D Program of China (Grant No. 2017YFA0206600), the National Natural Science Foundation of China (Grant Nos. 21761132001, 51573057, 91733302), and the China Postdoctoral Science Foundation (Grant No. 2019M650197).

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Vol. 68, Issue 15 - 2019-08-05

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