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Electrical Switching of Optical Gain in Perovskite Semiconductor Nanocrystals
Nano Letters ( IF 10.8 ) Pub Date : 2021-09-07 , DOI: 10.1021/acs.nanolett.1c02880
Zhengyuan Qin 1 , Chunfeng Zhang 1 , Lan Chen 1 , Tao Yu 1 , Xiaoyong Wang 1 , Min Xiao 1, 2
Affiliation  

Perovskite semiconductor nanocrystals are promising for optical amplification and laser applications benefiting from efficient optical gain generation. Nevertheless, the pump threshold is limited by more than one exciton per nanocrystal required to generate population inversion in neutral nanocrystals due to the level degeneracy. Here, we show that by charging nanocrystals with current injection, the level degeneracy can be lifted to generate charged exciton gain with markedly low excitation density. On the basis of the scenario, we have demonstrated electrical switching of amplified spontaneous emission in films of CsPbBr3 nanocrystals sandwiched by two electrodes with over 50% threshold reduction owing to charged excitons. Our work provides an effective approach to electrically modulated optical gain in colloidal perovskite nanocrystals for potential applications in advanced laser and information technology.

中文翻译:

钙钛矿半导体纳米晶体中光增益的电转换

钙钛矿半导体纳米晶体有望用于光学放大和激光应用,这得益于高效的光学增益生成。然而,由于能级简并,在中性纳米晶体中产生粒子数反转所需的每个纳米晶体超过一个激子限制了泵浦阈值。在这里,我们表明通过电流注入对纳米晶体充电,可以提升能级简并以产生具有显着低激发密度的带电激子增益。在该场景的基础上,我们已经证明了 CsPbBr 3薄膜中放大自发发射的电开关由于带电激子,纳米晶体被两个电极夹在中间,阈值降低了 50% 以上。我们的工作为胶体钙钛矿纳米晶体中的电调制光学增益提供了一种有效的方法,可用于先进激光和信息技术的潜在应用。
更新日期:2021-09-22
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