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

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...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2021-10, Vol.50 (38), p.13459-13467
Main Authors: Wu, Xiudi, Zhao, Shuang, Zhang, Liang, Dong, Langping, Xu, Yonghui, Yin, Shuwen, You, Hongpeng
Format: Article
Language:English
Subjects:
Broadband
Dipole interactions
Electric dipoles
Emission
Energy conversion
Energy transfer
Near infrared radiation
Phosphors
Photoluminescence
Thermal stability
Trivalent chromium
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Summary: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.
ISSN:1477-9226
1477-9234
DOI:10.1039/d1dt02259h