Journal
ADVANCED OPTICAL MATERIALS
Volume 10, Issue 24, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202202049
Keywords
broadband emission; Ca; 2LuScAl; Si-2; O-2; (12); Cr; (3+); fast imaging; light-emitting diodes; night vision; NIR phosphors; thermal stability
Categories
Funding
- National Natural Science Foundation of China [11704054]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2017jcyjA0925]
- Science and Technology Research Program of Chongqing Municipal Education Commission [KJQN201901134]
- China Scholarship Council Fund [201908500037]
- Graduate Student Innovation Program of Chongqing [CYS21476, CYS22668]
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Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) have promising applications in various fields. A novel NIR phosphor Ca2LuScAl2Si2O12:Cr3+ (CLSAS:Cr3+) is reported, which exhibits broadband emission and high internal quantum efficiency. It is used to fabricate NIR pc-LEDs for fast imaging of veins in human palm and fist, as well as night vision for objects.
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) have promising applications in food analysis, night vision imaging, and biological probes. Developing NIR phosphors with broadband emission and high efficiency has attracted immense interest. Herein, a novel NIR phosphor Ca2LuScAl2Si2O12:Cr3+ (CLSAS:Cr3+) is reported for the first time. Under the excitation of 442 nm light, CLSAS:Cr3+ shows broadband emission from 600 to 900 nm with a full width at half maximum (FWHM) of 142 nm, benefiting from the emissions of two Cr3+ centers in CLSAS, which is proved by the spectra and the decay curves. The internal quantum efficiency (IQE) of 73.7% is achieved and, at 423 K, the emission intensity maintains 76% of the value at room temperature. Combining the CLSAS:Cr3+ phosphor and the 450 nm blue chip, the NIR pc-LED is fabricated and demonstrated for fast imaging of veins in human palm and fist, as well as night vision for objects.
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