Highly thermally stable Cr3+ and Yb3+ codoped Gd2GaSbO7 phosphors for broadband near-infrared applications

Xiudi Wu; Shuang Zhao; Liang Zhang; Langping Dong; Yonghui Xu; Shuwen Yin; Hongpeng You

doi:10.1039/d1dt02259h

Highly thermally stable Cr³⁺ and Yb³⁺ codoped Gd₂GaSbO₇ phosphors for broadband near-infrared applications

Dalton Trans. 2021 Oct 5;50(38):13459-13467. doi: 10.1039/d1dt02259h.

Authors

Xiudi Wu^{1

2}, Shuang Zhao³, Liang Zhang^{1

2}, Langping Dong^{1

2}, Yonghui Xu^{1

2}, Shuwen Yin¹, Hongpeng You^{1

2}

Affiliations

¹ State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.
² University of Science and Technology of China, Hefei 230026, P. R. China.
³ Key Laboratory of Natural Medicine and Immune-Engineering of Henan Province, Henan University, Kaifeng 475004, Henan, P. R. China. szhao@henu.edu.cn.

PMID: 34487132
DOI: 10.1039/d1dt02259h

Abstract

Gd₂GaSbO₇:Cr³⁺,Yb³⁺ phosphors with efficient broadband NIR emission were prepared by a solid-state reaction. Under the excitation of 448 nm, the Gd₂GaSbO₇:Cr³⁺ (GGS:Cr³⁺) phosphor exhibits a broadband NIR emission band centered at approximately 770 nm with a full width at half maximum (FWHM) of 160 nm. In addition, Yb³⁺ codoping can distinctly improve the photoluminescence properties of the GGS:Cr³⁺ phosphor, leading to broadening of the FWHM and greatly enhancing the thermal stability of the phosphor. Moreover, the energy conversion process of Cr³⁺ → Yb³⁺ ions was analyzed in detail, demonstrating that the energy transfer mechanism conformed to electric dipole-dipole interaction. The NIR pc-LEDs assembled with the GGS:Cr³⁺ phosphor and blue LED chips possessed a maximum NIR output power of ∼21 mW at 100 mA driving current, indicating promising applications of the synthesized phosphor in NIR pc-LEDs.