Energy transfer realizes efficient NIR emitting Ca2ScTaO6:Cr3+, Yb3+ perovskite-structured phosphors. Issue 10 (15th May 2023)

• Record Type: Journal Article
• Authors: Chen, Mianhong; Fan, Hua; Lu, Zuizhi; Song, Jiayang; Zhang, Xinguo; Pang, Qi; Chen, Peican; Zhou, Liya
• Is Part Of: Ceramics international. Volume 49:Issue 10(2023)
• Page Start: 15717
• Page End: 15725
• Publication Date: 2023-05-15
• Subjects: Energy transfer -- NIR emitting phosphor -- Double perovskite; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2023.01.164
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: 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 window. In this work, using the Cr 3+ -Yb 3+ energy transfer (ET) strategy, the as-synthesized Ca2 ScTaO6 :Cr 3+, Yb 3+ phosphor retains 86.2% of the initial luminescence intensity of Yb 3+ at 373 K with characteristic emissions of both activators ranging from 700 nm to 1200 nm. The occupation of Cr 3+ into both Ta 5+ and Sc 3+ sites is confirmed by X-ray diffraction, time-resolved emission spectrum, and crystal structure. The efficient ET from Cr 3+ to Yb 3+ 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.