Color-Stable Deep-Blue Light-Emitting Diodes Based on Perovskite Nanosheet Films Passivated with Zwitterionic Choline Chloride and Rubidium Bromide,ACS Applied Nano Materials

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Color-Stable Deep-Blue Light-Emitting Diodes Based on Perovskite Nanosheet Films Passivated with Zwitterionic Choline Chloride and Rubidium Bromide
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2024-03-04 , DOI: 10.1021/acsanm.3c06004
Yuting Xu ₁ , Xingxing Tan ₁ , Lanlan Zhai ₁ , Yingyu Wang ₁ , He Huang ₁ , Guanghong Yang ₁ , Dicai Zhuang ₁ , Yun Yang ₁ , Lijie Zhang ₁ , Chao Zou ₁

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Incorporating a chlorine ion into a bromine-based perovskite is a straightforward strategy to achieve blue perovskite light-emitting diodes (PeLEDs). However, efficient deep-blue PeLEDs suffer from ineffective chlorine ion supplementation due to the low solubility of chloride and high deep-level defects in perovskite. Here, we propose multifunctional zwitterion choline chloride (ChCl) and rubidium bromide (RbBr) molecules, which not only provide free chlorine ion to fill the halide vacancies but also serve as passivating agents to eliminate Pb⁰ defects in perovskite nanosheets. Consequently, deep-blue PeLEDs were achieved with peak external quantum efficiencies of 3.58%, 2.41%, and 1.10%, which coordinate at (0.134, 0.063), (0.139, 0.052), and (0.141, 0.041), respectively.

中文翻译：

基于两性氯化胆碱和溴化铷钝化的钙钛矿纳米片薄膜的颜色稳定的深蓝色发光二极管

将氯离子掺入溴基钙钛矿中是实现蓝色钙钛矿发光二极管（PeLED）的简单策略。然而，由于氯化物的溶解度低和钙钛矿中的深层缺陷较多，高效的深蓝色 PeLED 面临着氯离子补充无效的问题。在这里，我们提出了多功能两性离子氯化胆碱（ChCl）和溴化铷（RbBr）分子，它们不仅提供游离氯离子来填充卤化物空位，而且还可以作为钝化剂来消除钙钛矿纳米片中的Pb ⁰缺陷。因此，深蓝色 PeLED 的峰值外量子效率分别为 3.58%、2.41% 和 1.10%，其配位分别为 (0.134, 0.063)、(0.139, 0.052) 和 (0.141, 0.041)。

更新日期：2024-03-04

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