Tunable near-infrared phosphor LiSc 2 SbO 6 :Cr 3+ by Mg 2+ substitution and Yb 3+ co-doping for phosphor-converted light-emitting diodes

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices
• Main Authors: Yang, Xu, Ren, Zihao, Yin, Tao, Yu, Jialong, Song, Xinying, Ma, Yuansheng, Guan, Li, Guo, Yingnan, Li, Xu, Wang, Fenghe
• Format: Journal Article
• Language: English
• Published: 2024
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/D4TC03112A

Near-infrared (NIR) phosphors have been extensively used in the fields of biological imaging, night vision monitoring, food safety inspection. Although Cr 3+ doped phosphors have been widely reported, achieving broadband and tunable NIR emissions remains challenging. In this work, Cr 3+ doped LiSc 2 SbO 6 broadband NIR phosphors were synthesized by high-temperature solid-phase method. LiSc 2 SbO 6 :Cr 3+ exhibits a wide emission band of 780 - 1400 nm. Using [Mg 2+ -Mg 2+ ] co-substitutes [Li + -Sc 3+ ] chemical units, the controllable emission achieved with emission peak turning in the range of 890 - 950 nm, FWHM fluctuates in the range of 215 - 239 nm, and the maximum intensity increased by 1.4 times. Co-doping with Yb 3+ ions, the luminous intensity of Li 0.7 Mg 0.6 Sc 1.7 SbO 6 :0.02Cr 3+ ,0.05Yb 3+ (LMSS:Cr 3+ ,Yb 3+ ) phosphor has been further enhanced by 5.62 times. LMSS:Cr 3+ ,Yb 3+ phosphor has great potential in the field of anti-counterfeiting and information encryption. Combining LMSS:Cr 3+ ,Yb 3+ with commercial blue LED chip, the obtained NIR pc-LED performs well in night vision and non-destructive testing applications.