Energy transfer realizes efficient NIR emitting Ca2ScTaO6:Cr3+, Yb3+perovskite-structured phosphors

作者：Chen, Mianhong; Fan, Hua; Lu, Zuizhi; Song, Jiayang; Zhang, Xinguo; Pang, Qi; Chen, Peican^*; Zhou, Liya^*

来源：Ceramics International, 2023, 49(10): 15717-15725.

DOI：10.1016/j.ceramint.2023.01.164

• Energy transfer
• NIR emitting phosphor
• Double perovskite

Stable and efficient broadband near-infrared (NIR) emitting phosphors are vital for the next-generation NIR sources. However, it still remains challenging to construct such phosphors, particularly those with a NIR-II In this work, using the Cr3+-Yb3+ energy transfer (ET) strategy, the as-synthesized Ca2ScTaO6:Cr3+, Yb3+ phosphor retains 86.2% of the initial luminescence intensity of Yb3+ at 373 K with characteristic emissions of both activators ranging from 700 nm to 1200 nm. The occupation of Cr3+ into both Ta5+ and Sc3+ sites is confirmed by X-ray diffraction, time-resolved emission spectrum, and crystal structure. The efficient ET from Cr3+ to Yb3+ is revealed by the diffuse reflection spectrum, steady-state and transient fluorescence. As a result, it contributes to the excellent performance of the phosphor. Based on the optimized phosphor, a NIR light-emitting diode is fabricated and demonstrated its advantage in imaging and potential application in information encryption. The result highlights ET as a robust strategy to construct efficient NIR phosphor.

• 单位
  广西大学; 南方医科大学