Color-Stable Deep-Blue Perovskite Light-Emitting Diodes Based on Organotrichlorosilane Post-Treatment,Advanced Functional Materials

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Color-Stable Deep-Blue Perovskite Light-Emitting Diodes Based on Organotrichlorosilane Post-Treatment
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-08-08 , DOI: 10.1002/adfm.202103219
Guangruixing Zou ₁ , Zhenchao Li ₁ , Ziming Chen _{1,

2} , Linghao Chu ₁ , Hin‐Lap Yip _{1,

3,

4,

5} , Yong Cao ₁

Affiliation

Recent studies of sky-blue perovskite light-emitting diodes (PeLEDs) have extensively promoted optimal device design to achieve an external quantum efficiency (EQE) above 12%. However, the development of thin-film deep-blue PeLEDs lags dramatically behind, especially with regards to meeting the latest Rec. 2020 standard. A trichloro(3,3,3-trifluoropropyl) silane post-treatment that drives the emission of perovskite into the deep-blue region, ranging from 440 to 460 nm, which meets the Rec. 2020 standard, is proposed. The chlorine ions released from the organotrichlorosilane molecules during their polycondensation reaction provide an addition halide source to fine tune the composition of the mixed halide perovskite films, leading to increase of bandgap and deep-blue emission. In addition, hydrogen bonds between the hydroxy groups of silane molecules and halide anions in perovskite can suppress ion migration for improving emission stability. As a result, an optimal PeLED is developed with deep-blue emission at 458 nm and excellent color stability, which yields an EQE and luminance of 1.1% and 130 cd m⁻², respectively, representing a state-of-the-art result for thin-film PeLEDs in this emission region. This work paves the way to achieve high-performance deep-blue PeLEDs with stable emissions to meet the demand for potential applications such as full-color display.

中文翻译：

基于有机三氯硅烷后处理的颜色稳定的深蓝色钙钛矿发光二极管

最近对天蓝色钙钛矿发光二极管 (PeLED) 的研究广泛促进了最佳器件设计，以实现 12% 以上的外部量子效率 (EQE)。然而，薄膜深蓝色 PeLED 的发展明显滞后，尤其是在满足最新的 Rec. 2020 标准。三氯（3,3,3-三氟丙基）硅烷后处理，可将钙钛矿发射到深蓝色区域，范围从 440 到 460 nm，符合 Rec。2020 标准，提出。有机三氯硅烷分子在缩聚反应过程中释放的氯离子提供了额外的卤化物源，以微调混合卤化物钙钛矿薄膜的成分，导致带隙和深蓝色发射的增加。此外，硅烷分子的羟基与钙钛矿中卤化物阴离子之间的氢键可以抑制离子迁移以提高发射稳定性。因此，开发了一种最佳 PeLED，具有 458 nm 的深蓝色发射和出色的颜色稳定性，可产生 1.1% 和 130 cd m 的 EQE 和亮度^-2分别代表该发射区域中薄膜 PeLED 的最新结果。这项工作为实现具有稳定发射的高性能深蓝色 PeLED 铺平了道路，以满足对全彩显示等潜在应用的需求。

更新日期：2021-08-08

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