A Novel Dual-mode Broadband Near-infrared Phosphor Mg5Ga2Sn2O12:Cr3+, Ni2+ Designed Based on Energy Transfer Strategy

Abstract

Near-infrared (NIR) phosphor-converted light-emitting diodes (NIR-pc-LEDs) are considered as ideal next-generation NIR light sources. However, the commercialization of NIR-pc-LEDs has been hindered by the narrow full width at half maximum (FWHM) of the NIR luminescent materials. To address this issue, we designed a novel dual-mode broadband NIR phosphor Mg5Ga2Sn2O12:Cr3+, Ni2+ (MGSO) based on an energy transfer strategy. The optimized MGSO:0.1Cr3+, 0.01Ni2+ shows ultra broadband NIR emission from 700 to 1650 nm under 424 nm excitation. The emission peaks are located at 820 nm (NIR-I region, Cr3+) and 1450 nm (NIR-II region, Ni2+). Rapid energy transfers from Cr3+ to Ni2+ was confirmed through a systematic analysis of the diffuse reflection spectra, excitation spectra, and fluorescence decay curves. The internal and external quantum efficiencies of MGSO:0.1Cr3+, 0.01Ni2+ are 68.2% and 30%, respectively. To further investigate its application prospect, a novel NIR light source was created by encapsulating MGSO:0.1Cr3+, 0.01Ni2+ with a 440 nm blue light LED. The testing results demonstrate its potential for applications in information encryption, bio-imaging, and non-destructive detection of organic solutions. This study provides a new perspective on the development of continuous broadband NIR phosphors.

Supplementary files

Article information

Article type
Research Article
Submitted
01 Apr 2025
Accepted
15 Jul 2025
First published
16 Jul 2025

Inorg. Chem. Front., 2025, Accepted Manuscript

A Novel Dual-mode Broadband Near-infrared Phosphor Mg5Ga2Sn2O12:Cr3+, Ni2+ Designed Based on Energy Transfer Strategy

X. Xie, W. Ge, Y. Tian, M. Yang and Y. Li, Inorg. Chem. Front., 2025, Accepted Manuscript , DOI: 10.1039/D5QI00881F

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