Issue 4, 2022

Synthesis of broadband NIR garnet phosphor Ca4ZrGe3O12: Cr3+, Yb3+ for NIR pc-LED applications

Abstract

There are outstanding application prospects for near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) in many fields such as non-destructive detection, bio-imaging, and modern agriculture, in which the development of NIR-emitting phosphors with large full width at half maximum (FWHM), high efficiency, and excellent thermal stability is the challenge of current research. Herein, a broadband NIR-emitting phosphor Ca4ZrGe3O12: Cr3+ (CZGO: Cr3+) was successfully synthesized, which ranged from 650 to 1250 nm with 160 nm FWHM under the excitation of blue light at 477 nm. Based on the first-principles theory calculation, the origination of its matrix luminescence was accurately predicted, and the site-selective occupancy and the formation of various charge transfer bands (CTBs) have also been revealed in detail. With the introduction of Yb3+ into CGZO: Cr3+, the FWHM was broadened to 230 nm, and the thermal stability was also significantly increased. Furthermore, a NIR pc-LED device was fabricated by combining CZGO: Cr3+/Yb3+ with a 450 nm commercial LED chip, and it demonstrated satisfactory performance in night vision and bio-imaging.

Graphical abstract: Synthesis of broadband NIR garnet phosphor Ca4ZrGe3O12: Cr3+, Yb3+ for NIR pc-LED applications

Article information

Article type
Research Article
Submitted
20 11 2021
Accepted
04 1 2022
First published
05 1 2022

Mater. Chem. Front., 2022,6, 440-449

Synthesis of broadband NIR garnet phosphor Ca4ZrGe3O12: Cr3+, Yb3+ for NIR pc-LED applications

J. Xiang, J. Zheng, X. Zhao, X. Zhou, C. Chen, M. Jin and C. Guo, Mater. Chem. Front., 2022, 6, 440 DOI: 10.1039/D1QM01540K

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