Xu Jun, Sun Jiabei, Liu Xiaoming, Zhan Sisi, Li Yanqing, Gao Along, Lin Jun
School of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, P. R. China.
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.
Inorg Chem. 2025 Jul 21;64(28):14586-14597. doi: 10.1021/acs.inorgchem.5c02092. Epub 2025 Jul 10.
In this work, a series of Eu-activated phosphors, including SrScO:xEu, BaSrScO:0.015Eu (0 ≤ ≤ 1), and BaScO:xEu, were successfully synthesized via a sol-gel method. The SrScO:xEu phosphors exhibited a broad red emission band centered at 609 nm under 430 nm blue-light excitation, with a measured internal quantum yield of 47.94%. Upon partial substitution of Sr by Ba in SrScO:0.015Eu, a pronounced redshift in the emission maximum was observed, extending from 609 to 843 nm and thereby covering the entire visible to near-infrared (NIR) spectral range, corresponding to a total shift of 234 nm. Structural analysis indicates that the emission behavior of Eu is strongly influenced by its coordination environment within [Sr/Ba1O] and [ScO] octahedra, which exhibit low-symmetry fields and induce substantial crystal field splitting (CFS). Thermal quenching behavior was evaluated by monitoring emission intensity at 150 °C, where SrScO:0.015Eu, SrBaScO:0.015Eu, and BaScO:0.015Eu retained 85.8%, 75.1%, and 65.8% of their room-temperature luminescence, respectively. These findings demonstrate excellent thermal stability and tunable red-to-NIR emission, establishing this phosphor family as a promising candidate for next-generation NIR-emitting materials and photonic applications.
在这项工作中，通过溶胶-凝胶法成功合成了一系列铕激活的磷光体，包括SrScO:x Eu、BaSrScO:0.015 Eu（0≤x≤1）和BaScO:x Eu。在430 nm蓝光激发下，SrScO:x Eu磷光体在609 nm处呈现出一个宽的红色发射带，测量得到的内量子产率为47.94%。在SrScO:0.015 Eu中用Ba部分替代Sr后，观察到发射最大值有明显的红移，从609 nm延伸到843 nm，从而覆盖了整个可见光到近红外（NIR）光谱范围，对应总位移为234 nm。结构分析表明，Eu的发射行为受到其在[Sr/Ba1O]和[ScO]八面体中的配位环境的强烈影响，这些八面体呈现低对称场并引起显著的晶体场分裂（CFS）。通过监测150°C下的发射强度来评估热猝灭行为，其中SrScO:0.015 Eu、SrBaScO:0.015 Eu和BaScO:0.015 Eu分别保留了其室温发光的85.8%、75.1%和65.8%。这些发现证明了其优异的热稳定性和可调节的红到近红外发射，使该磷光体家族成为下一代近红外发光材料和光子应用的有前途的候选者。
