Green Light-emitting Diodes Based on Sorbitol-passivated Perovskite Polycrystalline Films

LU Lu; DONG Jianhua; CHI Shurui; JIN Xudong; ZHAO Min; WANG Hua; MIAO Yanqin

doi:10.37188/CJL.20230110

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Green Light-emitting Diodes Based on Sorbitol-passivated Perovskite Polycrystalline Films

Device Fabrication and Physics | 更新时间：2023-11-01

- Green Light-emitting Diodes Based on Sorbitol-passivated Perovskite Polycrystalline Films
  增强出版
- Chinese Journal of Luminescence Vol. 44, Issue 10, Pages: 1833-1841(2023)
- 作者机构：
  
  1.太原理工大学新材料界面科学与工程教育部重点实验室，山西太原　030024
  2.兴县经开区铝镁新材料研发有限公司，山西兴县　033600
  3.山西浙大新材料与化工研究院，山西太原　030000
- 作者简介：
- 基金信息：
  
  Science and Technology Innovation Talent Team Project of Shanxi Province(202204051001013);Fundamental Research Program of Shanxi Province(20210302123115);Shanxi⁃Zheda Institute of Advanced Materials and Chemical Engineering(2021SX⁃FR007);Key Research and Development Program of High⁃level Scientific and Technological Talents in Lvliang City(2021RC⁃2⁃18)
- DOI：10.37188/CJL.20230110
  CLC： TN312.8;O482.31
- Published：05 October 2023，
  
  Received：28 April 2023，
  
  Revised：24 May 2023，
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卢璐,董建华,池淑瑞等.基于山梨醇钝化的绿光多晶薄膜钙钛矿发光二极管[J].发光学报,2023,44(10):1833-1841.

LU Lu,DONG Jianhua,CHI Shurui,et al.Green Light-emitting Diodes Based on Sorbitol-passivated Perovskite Polycrystalline Films[J].Chinese Journal of Luminescence,2023,44(10):1833-1841.
卢璐,董建华,池淑瑞等.基于山梨醇钝化的绿光多晶薄膜钙钛矿发光二极管[J].发光学报,2023,44(10):1833-1841. DOI： 10.37188/CJL.20230110.

LU Lu,DONG Jianhua,CHI Shurui,et al.Green Light-emitting Diodes Based on Sorbitol-passivated Perovskite Polycrystalline Films[J].Chinese Journal of Luminescence,2023,44(10):1833-1841. DOI： 10.37188/CJL.20230110.

摘要

金属卤化物钙钛矿具有高的缺陷容忍度、可调的发光峰位与较窄半峰宽等优异光电特性，在开发高性能发光二极管方面展现出巨大潜力。钙钛矿发光二极管的低成本溶液制备有利于其应用于显示与照明领域的大规模商业化生产，但溶液成膜过程中伴随着有机溶剂的挥发，成膜时易形成缺陷态，不利于高性能器件的实现。在钙钛矿前驱体溶液中引入添加剂是一种简单有效的钙钛矿缺陷钝化策略，其中，路易斯碱被证明是非常有效的添加剂之一。基于此，本文提出在前驱体溶液中引入小分子路易斯碱添加剂（山梨醇）来钝化薄膜缺陷，并制备了钙钛矿发光二极管。研究证明，山梨醇的引入可以明显改善薄膜质量，且山梨醇浓度为0.3 mol·L

-1

时，制备的器件实现了最佳电致发光性能，如最大外量子效率和亮度分别达到6.71%和7 654 cd·m

-2

，且器件展现出较好的光谱稳定性与重复性。本工作对改善多晶薄膜成膜质量和提高钙钛矿发光二极管器件方面具有重要意义。

Abstract

Metal halide perovskite has excellent photoelectric characteristics such as high defect tolerance， tunable peak position and narrow full width at half maximum， which exhibits great potential in the development of high-performance light-emitting diodes. Perovskite light-emitting diodes can be applied to the large-scale commercial production in the display and lighting fields due to low-cost solution preparation. However， the adverse defects are formed in the process of film formation accompanied by the organic solvent volatilization， which are not conducive to the realization of high performance devices. Introducing additive in perovskite precursor solution is a simple and effective strategy to passivate defects. It is reported that the Lewis base is one of the effective additives. Based on analysis， in this work， we propose to introduce a small molecule Lewis base additive （sorbitol） into the precursor solution to passivate the defects of perovskite film， and fabricate perovskite light-emitting diodes. The experiment results show that the introduction of sorbitol can significantly improve the film quality. And when the concentration of sorbitol is 0.3 mol·L

-1

， the corresponding device achieves the best electroluminescence performance with the maximum external quantum efficiency and luminance of 6.71% and 7 654 cd·m

-2

， respectively. In addition， the resulting device also shows good spectral stability and repeatability. This work is of great significance to improve the polycrystalline film forming quality and boosting the performance of perovskite light-emitting diodes.

关键词

多晶钙钛矿发光二极管山梨醇缺陷钝化

Keywords

polycrystalline perovskitelight-emitting diodessorbitoldefect passivation

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