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Effect of regulating K+/Na+ ratio on the structure and optical properties of double perovskite Cs2NaBiCl6∶Mn2+
Author NameAffiliationE-mail
YU Qilin School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China  
XU Yifei School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China  
ZHANG Pengjun School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China  
HAO Shuwei School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China  
ZHU Chongqiang School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China zcq90@hit.edu.cn 
YANG Chunhui School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China  
Abstract: A series of Cs2NaBiCl6∶Mn2+and Cs2Na1-xKxBiCl6∶Mn2+ phosphors were synthesized using a solvothermal method. Crystal structures and optical properties were systematically studied through theoretical calculations and experimental measurements. The results showed that in the Cs2NaBiCl6∶Mn2+ system, localized excitation absorption near ultraviolet light centered on the [BiCl6]3- octahedron was observed. With the increase of Mn2+ doping concentration, energy transfer from [BiCl6]3- to Mn2+ promoted electronic transitions between the d orbitals of Mn2+ and produced orange-yellow luminescence. After further introducing K+, the photoluminescence (PL) intensity and color purity of Cs2NaBiCl6∶Mn2+ were enhanced. It was confirmed that the introduction of K+ effectively tuned the density of states composition of Cs2NaBiCl6∶Mn2+ and promoted the 1S0→3P1,2 electron transition of [BiCl6]3-, thus enhancing the PL intensity of Cs2NaBiCl6∶Mn2+, and the color purity was calculated to be 93.58% using CIE software. The final results suggested that Cs2Na1-xKxBiCl6∶Mn2+ had strong orange-yellow luminescent properties.
Keywords: Cs2NaBiCl6  Mn2+  double perovskite  doping  optical property
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YU Qilin,XU Yifei,ZHANG Pengjun,HAO Shuwei,ZHU Chongqiang,YANG Chunhui.Effect of regulating K+/Na+ ratio on the structure and optical properties of double perovskite Cs2NaBiCl6∶Mn2+[J].Chinese Journal of Inorganic Chemistry,2025,41(6):1058-1067.
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Chinese Journal of Inorganic Chemistry