Issue 30, 2024

CaY2ZrScAl3O12:Cr3+—an efficient and thermally stable garnet phosphor for high-performance NIR LEDs

Abstract

High-quantum efficiency (QE) and superior luminescence thermal stability NIR phosphors are indispensable for producing advanced NIR pc-LEDs. Despite this, the broadband NIR phosphor peaking around ∼780 nm often falls short in performance. Our research focused on developing a series of CaY2ZrSc1−xAl3O12:xCr3+ (CYZS:xCr3+) NIR phosphors, where x ranges from 0.01 to 0.20 mol, through strategic chemical substitutions of [Ca2+–Zr4+–Sc3+] for [Y3+–Al3+–Al3+] in Y3Al5O12:Cr3+ (YAG:Cr3+). This modification yielded broadband NIR emissions centered at ∼780 nm when stimulated with blue light. Remarkably, the optimized CYZS:0.08Cr3+ phosphor demonstrated exceptional QE values (IQE/EQE = 78.4%/31.6%), alongside outstanding thermal stability, maintaining around 84.3% of its original intensity at 423 K. Finally, we fabricated a high-performance NIR pc-LED device by combining CYZS:0.08Cr3+ with a blue LED chip (455 nm). The integrated NIR pc-LED boasts an impressive output power of 69.7 mW at 150 mA, along with a high photoelectric conversion efficiency of 22.2% when operating at 10 mA. Our findings indicate that CYZS:xCr3+ phosphors harbor promising applications in advancing NIR pc-LEDs.

Graphical abstract: CaY2ZrScAl3O12:Cr3+—an efficient and thermally stable garnet phosphor for high-performance NIR LEDs

Supplementary files

Article information

Article type
Communication
Submitted
05 Jun 2024
Accepted
16 Jul 2024
First published
17 Jul 2024

J. Mater. Chem. C, 2024,12, 11340-11346

CaY2ZrScAl3O12:Cr3+—an efficient and thermally stable garnet phosphor for high-performance NIR LEDs

T. Zheng, Y. Ding, Y. Han, M. Luo, Z. Chu, Z. Fan, H. Cao, F. Duan and Y. Xiao, J. Mater. Chem. C, 2024, 12, 11340 DOI: 10.1039/D4TC02328E

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