Issue 1, 2021

A highly efficient and thermally stable broadband Cr3+-activated double borate phosphor for near-infrared light-emitting diodes

Abstract

Highly efficient and thermally stable broadband near-infrared (NIR) phosphors are urgently required for phosphor-converted light-emitting diodes (pc-LEDs), which are compact, low cost and promising for applications such as food analysis and agricultural science. Herein, a NIR phosphor, GdAl3(BO3)4:Cr3+ (GAB:Cr3+), with high emission efficiency and excellent thermal stability is presented. Under blue light excitation, GAB:Cr3+ shows a broad emission band covering 650–1000 nm with a full width at half maximum of ∼140 nm. Particularly, the 1.0 at% Cr3+ doped sample exhibits a photoluminescence (PL) quantum yield as high as 91%, and no decline of the PL intensity is observed even when the temperature is raised from 298 to 423 K. By combining the GAB:Cr3+ phosphor with a commercial blue LED chip, a high-performance NIR pc-LED is fabricated with a NIR radiant flux of 81 mW under a drive current of 350 mA. Furthermore, an aging test was performed on this device at 85 °C and 85% humidity for 480 h, and the radiant flux retained up to 95% of its initial value, which is comparable to the commercial phosphors. These results suggest that GAB:Cr3+ is a promising candidate for broadband pc-LEDs in NIR spectroscopy applications.

Graphical abstract: A highly efficient and thermally stable broadband Cr3+-activated double borate phosphor for near-infrared light-emitting diodes

Supplementary files

Article information

Article type
Paper
Submitted
10 oct. 2020
Accepted
09 nov. 2020
First published
10 nov. 2020

J. Mater. Chem. C, 2021,9, 164-172

A highly efficient and thermally stable broadband Cr3+-activated double borate phosphor for near-infrared light-emitting diodes

D. Huang, H. Zhu, Z. Deng, H. Yang, J. Hu, S. Liang, D. Chen, E. Ma and W. Guo, J. Mater. Chem. C, 2021, 9, 164 DOI: 10.1039/D0TC04803H

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