光子上转换
材料科学
荧光粉
兴奋剂
发光
光电子学
陶瓷
持续发光
复合材料
热释光
作者
Yue Wang,Weiyan Lei,Shiran Wu,Fengyan Niu,Qisheng He,Yi Shen,Fengfeng Li
标识
DOI:10.1016/j.ceramint.2023.01.031
摘要
Persistent luminescence ceramic phosphors (PLCPs) are widely used because of their special optical properties. CaSnO3, with perovskite structure, is matrix material of PLCPs with excellent performance. In this work, we demonstrated that Bi3+ transforms into Bi2+ and exhibits near-infrared (NIR)-persistent luminescence when Bi3+ is doped into CaSnO3. Co-doping Li+ can inhibit conversion process. In addition, resulting Li+, Bi3+-codoped CaSnO3 exhibits blue persistent luminescence, especially when calcined under vacuum. And CaSnO3, Bi2+ can achieve NIR excitation-NIR emission in absence of upconversion materials compared with general NIR PLCPs, which are excited by high-energy photons. This phenomenon is caused by trap energy-upconversion, which allows carrier transfer from deep trap to shallow trap. This special property enables greater safety and deep-tissue imaging with greater photon utilization compared with ordinary upconversion platforms. This work paves a way for applications of NIR PLCPs in bio-imaging.
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