A novel near-infrared phosphor Mg 2 InSbO 6 :Cr 3+ with high quantum efficiency and considerable persistent luminescence duration

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Vol. 10; no. 27; pp. 10047 - 10057
• Main Authors: Su, Jiangyue, Pang, Ran, Tan, Tao, Wang, Shangwei, Yuan, Weihong, Wang, Jiutian, Chen, Xuexia, Wu, Haiyan, Li, Chengyu, Zhang, Hongjie
• Format: Journal Article
• Language: English
• Published: 14.07.2022
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/D2TC01365G

A series of novel non-gallate near-infrared (NIR) Mg 2 InSbO 6 :Cr 3+ phosphors were successfully prepared using the solid-state reaction method. With the strong crystal field, double-perovskite oxide Mg 2 InSbO 6 :Cr 3+ under ultraviolet (UV) excitation exhibits intense NIR emission centered at 698 nm with an internal quantum efficiency of 70.8%. Apart from photoluminescence, NIR persistent luminescence can also be detected from the Mg 2 InSbO 6 :Cr 3+ phosphor. The persistent luminescence from the optimized sample Mg 2 InSbO 6 :0.3 mol% Cr 3+ can still be recognized after ceasing the 365 nm UV excitation for 24 h with the aid of a night-vision instrument. These phosphors can be photostimulated by NIR light rapidly to enhance the NIR signal. The persistent luminescence of Mg 2 InSbO 6 :Cr 3+ can penetrate beef of 4 cm thickness, which suggests its great potential in biological imaging application. Based on the results of persistent luminescence and thermoluminescence, a feasible afterglow mechanism of the Mg 2 InSbO 6 :Cr 3+ phosphor is proposed and discussed. The present work might provide a new perspective for developing novel NIR phosphors with high quantum efficiency and considerable persistent luminescence duration.