Application of organic additive in perovskite light-emitting diodes

Xin-yan LIU; Guan-wei SUN; Zhe LIU; Fan-yuan MENG; Shi-jian SU

doi:10.37188/CJLCD.2020-0261

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Application of organic additive in perovskite light-emitting diodes

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

- Application of organic additive in perovskite light-emitting diodes
- Chinese Journal of Liquid Crystals and Displays Vol. 36, Issue 1, Pages: 149-157(2021)
- 作者机构：
  
  华南理工大学材料科学与工程学院, 广东广州 510640
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China;National Natural Science Foundation of China;National Natural Science Foundation of China
- DOI：10.37188/CJLCD.2020-0261
  CLC： TP394.1;TH691.9
- Received：08 October 2020，
  
  Accepted：21 October 2020，
  
  Published：2021-01
- 稿件说明：
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Xin-yan LIU, Guan-wei SUN, Zhe LIU, et al. Application of organic additive in perovskite light-emitting diodes[J]. Chinese journal of liquid crystals and displays, 2021, 36(1): 149-157.
DOI：

Xin-yan LIU, Guan-wei SUN, Zhe LIU, et al. Application of organic additive in perovskite light-emitting diodes[J]. Chinese journal of liquid crystals and displays, 2021, 36(1): 149-157. DOI： 10.37188/CJLCD.2020-0261.

摘要

为了得到高色纯度、高发光效率且制备方法简单的深红光钙钛矿电致发光器件（LED），本文选用乙胺碘（Ethylammonium Iodide（EAI））作为有机添加剂，掺杂在溶剂为N'N-二甲基甲酰胺（DMF）的CsPbBr

0.5

2.5

钙钛矿前驱体溶液中，采用旋涂的方法且在不使用反溶剂的情况下，得到不同EAI掺杂比例的钙钛矿薄膜。经研究发现，当掺杂摩尔比例为0.5：1（EAI：Pb

）时，钙钛矿薄膜平整致密，经钝化后的钙钛矿晶粒最小，约为40 nm。以此钙钛矿薄膜为发光层，制备结构为ITO（90 nm）/PVK（30 nm）/perovskite（40 nm）/TPBi（55 nm）/CsF（1.2 nm）/Al（120 nm）的深红光钙钛矿发光器件，其启亮电压为2.7 V，最大亮度为320 cd/m

，最大外量子效率（EQE）为7%，发光峰为680 nm，色坐标为（0.71，0.28）。因此，有机添加剂EAI可以有效抑制钙钛矿大晶粒生长，同时降低缺陷态密度，利用简单的溶液加工技术和分子尺度自组装工艺得到了高质量薄膜，进而制备出性能优良的深红光钙钛矿LED。

Abstract

In order to obtain deep-red perovskite light-emitting diodes (LEDs) with high color purity

high luminous efficiency

and simple preparation method

Ethylammonium iodide (EAI) is selected as an organic additive. EAI is doped in CsPbBr

0.5

2.5

perovskite precursor solution with the solvent of N'N-dimethylformamide (DMF). In this method

spin-coating is used without using anti-solvent to obtain perovskite films with different EAI doping ratios. It is found that when the doping molar ratio is 0.5:1 (EAI:Pb

)

a flat and compact perovskite film is obtained

and the perovskite grains after passivation are reduced to 40 nm. Based on this perovskite film as the light-emitting layer

a deep-red perovskite LED with the structure of ITO (90 nm)/PVK (30 nm)/perovskite (40 nm)/TPBi (55 nm)/CsF (1.2 nm)/Al (120 nm) was fabricated

giving a turn-on voltage of 2.7 V

a maximum luminance of 320 cd/m

a maximum external quantum efficiency (EQE) of 7%

and a bright red electroluminescence peak of 680 nm with a Commission Internationale del'Eclairage (CIE) coordinates of (0.71

0.28). Therefore

the organic additive EAI can effectively inhibit the growth of large perovskite grains while reducing the density of defect states. Simple solution processing technology and molecular-scale self-assembly technology are used to obtain high-quality thin films for preparing excellent deep-red perovskite LED.

关键词

Keywords

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