荧光粉
材料科学
猝灭(荧光)
红外线的
热发射
零(语言学)
热的
类型(生物学)
分析化学(期刊)
光电子学
光学
荧光
物理
热力学
生态学
语言学
哲学
化学
色谱法
生物
作者
Hong Li,Jingkai Jiao,Xianfeng Xiang,Jianze Wu,Wanbiao Hu,Jiyang Xie,Shuping Huang,Hongzhi Zhang,Jing Zhu
标识
DOI:10.1002/adom.202302391
摘要
Abstract Cr 3+ doped garnet‐type (A 3 B 2 C 3 O 12 ) near‐infrared (NIR) phosphors is a desirable research hotspot due to their prospective night vision, bioimaging, and plant growth utilizations. Meanwhile, the origin of multisite broad emission is yet a controversial topic. To resolve the trouble, verifying accurately the multiple Cr 3+ occupancy sites is a key. Furthermore, it is an urgent need for improving the external quantum efficiency and luminescent thermostability. Herein, in Y 3 Sc 2 Al 3 O 12 (YSAO), advanced electron microscopy technique is employed to directly confirm that the obtained broadband NIR emission originates from Cr 3+ in [ScO 6 ] octahedral and [YO 8 ] dodecahedral sites. The optimal YSAO:5%Cr 3+ sample exhibits high quantum efficiency (IQE/EQE = 74/31%) and near‐zero thermal quenching (97%@423 K and 92%@473 K). The theoretical calculations and experimental proofs reveal that YSAO possesses high structural rigidity and wide bandgap, which is responsible for the extremely thermostable luminescence. The high‐power YSAO:5%Cr 3+ ‐converted NIR LED device shows promising multifunctional applications. This work not only provides an efficient NIR broadband phosphor with near‐zero thermal quenching, but also provides an effective determination method for the multiple emitting centers of phosphor materials.
科研通智能强力驱动
Strongly Powered by AbleSci AI