Wang Yunfeng, Feng Jiajun, Chen Pengyun, Huo Jiansheng, Zhang Qiuhong, Liu Shuanglai, Tang Mengyuan, Li Junhao, Zhou Jianbang
School of Information Engineering, Nanyang Institute of Technology, Nanyang 473004, P.R. China.
School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, P.R. China.
Dalton Trans. 2023 Jul 25;52(29):10071-10078. doi: 10.1039/d3dt01744c.
Trivalent chromium ion-activated broadband near-infrared (NIR) luminescence materials have shown great application prospects as next-generation NIR light sources, but improvement of the luminescence efficiency remains a challenge. Herein, novel KLiScF:Cr and KLiScF:Cr/Mn broadband fluoride NIR phosphors are designed and prepared by a combination of hydrothermal and cation exchange methods for the first time. The crystal structure and photoluminescence (PL) properties of KLiScF:Cr are studied in detail, which shows strong absorption in the blue light region ( = 432 nm) and broadband NIR emission ( = 770 nm) with a PL quantum efficiency of 77.6%. More importantly, the NIR emission of Cr can be enhanced by co-doping with Mn, which may provide an alternative way for improving the PL intensity of Cr-activated broadband NIR phosphors. Finally, a NIR phosphor-converted LED (pc-LED) device is fabricated using the as-prepared NIR phosphor and its application in bio-imaging and night vision has been evaluated.
三价铬离子激活的宽带近红外（NIR）发光材料作为下一代近红外光源已显示出巨大的应用前景，但提高发光效率仍然是一个挑战。在此，首次通过水热法和阳离子交换法相结合的方式设计并制备了新型KLiScF:Cr和KLiScF:Cr/Mn宽带氟化物近红外荧光粉。详细研究了KLiScF:Cr的晶体结构和光致发光（PL）性能，其在蓝光区域（λ = 432 nm）有强烈吸收，宽带近红外发射（λ = 770 nm），光致发光量子效率为77.6%。更重要的是，通过与Mn共掺杂可以增强Cr的近红外发射，这可能为提高Cr激活的宽带近红外荧光粉的光致发光强度提供一种替代方法。最后，使用所制备的近红外荧光粉制作了近红外荧光粉转换发光二极管（pc-LED）器件，并评估了其在生物成像和夜视中的应用。
