Highly stable blue perovskite light-emitting diodes induced by trifluoroacetate

Hao YUAN; Ling-mei KONG; Lin WANG; Yong-jiang DOU; Yun LUO; Xu-yong YANG

doi:10.37188/CJLCD.2020-0286

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Highly stable blue perovskite light-emitting diodes induced by trifluoroacetate

Perovskite Light-Emitting Materials and Devices | 更新时间：2021-02-01

- Highly stable blue perovskite light-emitting diodes induced by trifluoroacetate
- Chinese Journal of Liquid Crystals and Displays Vol. 36, Issue 1, Pages: 123-133(2021)
- 作者机构：
  
  上海大学新型显示技术及应用集成教育部重点实验室, 上海 200072
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China;National Natural Science Foundation of China
- DOI：10.37188/CJLCD.2020-0286
  CLC： TP394.1;TN383.1
- Received：24 October 2020，
  
  Accepted：13 November 2020，
  
  Published：2021-01
- 稿件说明：
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Hao YUAN, Ling-mei KONG, Lin WANG, et al. Highly stable blue perovskite light-emitting diodes induced by trifluoroacetate[J]. Chinese journal of liquid crystals and displays, 2021, 36(1): 123-133.
DOI：

Hao YUAN, Ling-mei KONG, Lin WANG, et al. Highly stable blue perovskite light-emitting diodes induced by trifluoroacetate[J]. Chinese journal of liquid crystals and displays, 2021, 36(1): 123-133. DOI： 10.37188/CJLCD.2020-0286.

摘要

近年来，金属卤化物蓝光钙钛矿发光二极管（Perovskite light-emitting diodes，PeLEDs）的发展十分迅速。然而，氯/溴混合的蓝光钙钛矿在电场作用下容易发生卤素离子迁移，致使发光光谱发生红移。光谱的不稳定性已严重地阻碍了蓝光PeLEDs的商业应用。本文通过在钙钛矿前驱体中引入三氟乙酸铯（CsTFA）来提高CsPbClBr

晶体的成核密度，诱导形成了小晶粒的钙钛矿发光薄膜，进而增加了钙钛矿薄膜的致密度。更重要的是，CsTFA中的碳氧双键（C=O）可以有效钝化CsPbClBr

晶粒晶界处的缺陷，抑制卤素阴离子发生离子迁移，极大地提升蓝光PeLEDs的光谱稳定性。在10 V的电压下，PeLEDs的发光光谱仍可以保持非常稳定。此外，对比参比器件，PeLEDs的最大亮度和最高外量子效率也分别提高了31倍和8倍。

Abstract

Recently

blue perovskite light emitting diodes (PeLEDs) is becoming a research hot spot. However

the electroluminescence (EL) spectra of blue PeLEDs based on Cl/Br mixed perovskites will be redshifted under bias

due to the ion migration of Cl and Br anions

which badly hinders the commercialization of blue PeLEDs. In this work

the cesium trifluoroacetate (CsTFA) is introduced to the CsPbClBr

perovskite precursor to enhance the nucleation density

leading to the formation of small nanoparticle-based perovskite films and thus enhancing the film morphology. Most importantly

the C=O bonds in CsTFA can function effectively in passivating the defects at grain boundaries and preventing the ion migration of halide anions

which largely stabilize the EL spectra. The EL spectra can maintain even under high driven voltage. The maximum luminance and the external quantum efficiency (EQE) is enhanced by 31- and 8-fold compared with control devices

respectively.

关键词

Keywords

references

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