Journal of Inorganic Materials ›› 2023, Vol. 38 ›› Issue (9): 1083-1088.DOI: 10.15541/jim20230005

Special Issue: 【能源环境】钙钛矿(202310)

• RESEARCH ARTICLE • Previous Articles     Next Articles

Cs2Ag0.1Na0.9BiCl6:Tm3+ Double Perovskite: Coprecipitation Preparation and Near-infrared Emission

WANG Machao1,2(), TANG Yangmin1,2, DENG Mingxue1, ZHOU Zhenzhen1, LIU Xiaofeng3, WANG Jiacheng1,2(), LIU Qian1()   

  1. 1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
    2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Science, Beijing 100864, China
    3. School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
  • Received:2023-01-03 Revised:2023-03-15 Published:2023-09-20 Online:2023-04-11
  • Contact: WANG Jiacheng, professor. E-mail: jiacheng.wang@mail.sic.ac.cn;
    LIU Qian, professor. E-mail: qianliu@mail.sic.ac.cn
  • About author:WANG Machao (1998-), male, Master candidate. E-mail: wangmachao21@mails.ucas.ac.cn
  • Supported by:
    National Natural Science Foundation of China(92163117);National Natural Science Foundation of China(62175210);Shanghai Municipal Natural Science Foundation(20ZR1465900);Shanghai Municipal Natural Science Foundation(22ZR1472100)

Abstract:

Cs2NaBiCl6 double perovskite with indirect band demonstrates near-infrared (NIR) wide-band emission, but its low efficacy limits its potential applications in the field of NIR. In this work, micron-sized Cs2Ag0.1Na0.9BiCl6:Tm3+ double perovskites were synthesized via the coprecipitation method, which shows enhanced NIR emission. Their optical absorption, photoluminescence emission (PL) and excitation (PLE), time-resolved photoluminescence, and photoluminescence quantum yield (PLQY) were investigated. The Cs2Ag0.1Na0.9BiCl6:Tm3+ shows optical bandgap of 3.06 eV and NIR broad emission peaking at 680 nm under 350 nm excitation due to recombination of self-trapped excitons (STEs). Meanwhile, a new emission peak could be observed at 810 nm due to Tm3+ doping. The PLQY in the band range of 780-830 nm can be increased by 6.05 times from 1.67% to 11.77% and in the band range of 650-900 nm can reach 25.22%. This study proves the feasibility of Cs2Ag0.1Na0.9BiCl6:Tm3+ double perovskite as new NIR emission material.

Key words: near-infrared emission, self-trapped excitons, coprecipitation, double perovskite, Cs2Ag0.1Na0.9BiCl6

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