Tin-Based Multiple Quantum Well Perovskites for Light-Emitting Diodes with Improved Stability

Ying Wang, Renmeng Zou, Jin Chang, Zewu Fu, Yu Cao, Liangdong Zhang, Yingqiang Wei, Decheng Kong, Wei Zou, Kaichuan Wen, Ning Fan, Nana Wang, Wei Huang, Jianpu Wang

科研成果: 期刊稿件文章同行评审

84 引用 (Scopus)

摘要

Tin-based halide perovskites have attracted considerable attention for nontoxic perovskite light-emitting diodes (PeLEDs), but the easy oxidation of Sn 2+ and nonuniform film morphology cause poor device stability and reproducibility. Herein, we report a facile approach to achieve efficient and stable lead-free PeLEDs by using tin-based perovskite multiple quantum wells (MQWs) for the first time. On the basis of various spectroscopic investigations, we find that the MQW structure not only facilitates the formation of uniform and highly emissive perovskite films but also suppresses the oxidation of Sn 2+ cations. The tin-based MQW PeLED exhibits a peak external quantum efficiency of 3% and a high radiance of 40 W sr -1 m -2 with good reproducibility. Significantly, these devices show excellent operational stability with over a 2 h lifetime under a constant current density of 10 mA cm -2 , which is comparable to that of lead-based PeLEDs. These results suggest that perovskite MQWs can provide a promising platform for achieving high-performance lead-free PeLEDs.

源语言英语
页(从-至)453-459
页数7
期刊Journal of Physical Chemistry Letters
10
3
DOI
出版状态已出版 - 7 2月 2019

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