Citation: Jinzeng XU, Hui GAO, Guoqing CHEN, Keke WANG, Jinhui HU. Luminescence properties of K⁺ doped double perovskite Cs₂AgInCl₆[J]. Chinese Journal of Inorganic Chemistry, ;2024, 40(2): 405-411. doi: 10.11862/CJIC.20230149 shu

Luminescence properties of K⁺ doped double perovskite Cs₂AgInCl₆

Jinzeng XU ^{1, 2} ,
Hui GAO ^{1, 2,,} ,
Guoqing CHEN ^{1, 2} ,
Keke WANG ^{1, 2} ,
Jinhui HU ^{1, 2}

1.
School of Science, Jiangnan University, Wuxi, Jiangsu 214122, China
2.
Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Wuxi, Jiangsu 214122, China

Corresponding author: Hui GAO, 8201807140@jiangnan.edu.cn
Received Date: 18 April 2023
Revised Date: 23 November 2023

Figures(8)

K⁺ doped double perovskite Cs₂AgInCl₆ nanomaterial was prepared by solid phase ball milling method, which is environmentally friendly without ligands. The crystal structure was studied by X-ray diffraction and Raman spectrum, and the luminescence properties were studied by excitation spectrum, emission spectrum, and time-resolved spectrum. The results show that the Cs₂AgInCl₆ is a cubic crystal, which belongs to Fm3m space group. Due to parity-forbidden transition, the photoluminescence quantum yield (PLQY) is low, less than 0.1%. When K⁺ doping is less than 60%, it mainly replaces Ag⁺, which causes lattice expansion of Cs₂AgInCl₆, eliminates inversion symmetry of lattice structure, breaks parity forbidden transition, and enhances photoluminescence intensity of Cs₂AgInCl₆. The optimal doping ratio was 40%, the center wavelength of Cs₂Ag_0.6K_0.4InCl₆ was 640 nm, the half-height width was 180 nm, the average fluorescence lifetime was 29.2 ns and the PLQY reached 10.5%. When the doping ratio of K⁺ exceeds 60%, K⁺ begins to replace the position of Cs⁺, which results in the presence of cubic phase Cs_2-xK_1+x-yAg_yInCl₆ and monoclinic phase Cs_2-xK_1+xInCl₆. These products are dominated by non-radiative recombination due to strong electron-phonon coupling.
- double perovskite,
- K⁺ doping,
- parity-forbidden transition,
- ball milling
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沈阳化工大学材料科学与工程学院沈阳 110142

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Luminescence properties of K⁺ doped double perovskite Cs₂AgInCl₆