Journal
DALTON TRANSACTIONS
Volume 51, Issue 43, Pages 16757-16763Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2dt03034a
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Funding
- Guangzhou Basic and Applied Basic Research Project [202201010689]
- Zhongshan City Social Welfare and Basic Research Project [2020B2047]
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A new efficient and thermally stable garnet phosphor, Gd3In2Ga3O12:Cr3+, with a broadband emission peak, has been reported for potential broadband NIR pc-LED applications.
Compact broadband near-infrared (NIR) light sources generated by phosphor-converted light-emitting diodes (pc-LEDs) have attracted considerable interest in emerging smart NIR spectroscopy applications. However, discovering a highly efficient and thermally stable broadband NIR phosphor still remains a significant challenge. Here, we report a new efficient garnet phosphor, Gd3In2Ga3O12:Cr3+, which has a broadband emission peaking at 780 nm with a full-width at half maximum (FWHM) of 124 nm. The optimized Cr3+-doping concentration of this material is particularly high (9 mol%), resulting in a high quantum yield and absorption efficiency of 85.3% and 49.1%, respectively. Moreover, 87.7% of the initial emission intensity can be retained when heating up to 150 degrees C, demonstrating the excellent thermal stability of this material. Fabricating a prototype NIR device by using the as-prepared material in combination with a blue LED chip, an excellent NIR output power (33.7 mW) with a NIR photoelectronic conversion efficiency of 12.0% can be achieved under a 100 mA driving current. These results indicate that the Gd3In2Ga3O12:Cr3+ phosphor may have great potential for broadband NIR pc-LED applications.
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