Journal of Energy Chemistry ›› 2023, Vol. 76 ›› Issue (1): 495-502.DOI: 10.1016/j.jechem.2022.09.043

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Enhancement and recovery of photoluminescence and stability by multifunctional etching ligands treatment for perovskite nanocrystals

Yang Zhaoa,1, Haipeng Zenga,1, Xueqing Caia, Yingshan Zhoub,*, Yangming Jiangc, Xin Zhenga, Lin Lia, Shujing Zhanga, Long Luoa, Weixi Lia, Xiaoru Zhanga, Ranran Liua, Wenxi Lianga, Rui Guoa, Xiong Lia,*   

  1. aMichael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China;
    bState Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan 430073, Hubei, China;
    cState Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Medical University, Guiyang 550014, Guizhou, China
  • Received:2022-07-05 Revised:2022-09-18 Accepted:2022-09-27 Published:2023-01-10
  • Contact: *E-mail addresses: zyssyz@126.com (Y. Zhou), xiongli@hust.edu.cn (X. Li).
  • About author:1These authors contributed epaually to this work.

Abstract: Perovskite nanocrystals (PNCs) have recently become promising optoelectronic materials due to their excellent photophysical properties. However, the highly dynamic binding state between ligands and the surface of PNCs has severely restricted their luminescent properties and stabilities. In this work, 1,3-bisbenzyl-2-oxoimidazolidine-4,5-dicarboxylic acid (cycle acid, CA) is introduced as both an etchant and a ligand upon post-synthetic surface treatment of PNCs. By removing the imperfect octahedrons [PbX6]4- and passivating the surface defects synergistically, this treatment improves photoluminescence quantum yields from 76% to 95% and enhances the stability of PNCs against polar solvent, moisture, heat, and illumination. Meanwhile, CA can effectively and instantly recover the luminescence emission for aged PNCs. As a result, the CA-CsPbBr3 PNCs and CA-CsPbIxBr3-x PNCs are applied as color-converting layers on a blue LED chip for warm white light-emitting diodes (WLEDs) with a color coordinate of (0.41, 0.40). Importantly, the CA-based WLED device exhibits superior stability in operational conditions.

Key words: Perovskite nanocrystals, Synergistic effect, Emission recovery, White light emitting diodes, Stability