4.7 Article

Broadband La2LiSbO6: Cr3+ Phosphors with Double Luminescent Centers for NIR pc-LEDs

Journal

INORGANIC CHEMISTRY
Volume 62, Issue 42, Pages 17371-17381

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.3c02686

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The La2LiSbO6: xCr3+ phosphors were synthesized and the optimized doping concentration of Cr3+ was determined to be 0.01. The phosphor exhibits a wide emission band under 517 nm excitation, making it promising for night vision applications.
The La2LiSbO6: xCr3+ phosphors were synthesized by means of a high-temperature solid-phase method. Based on the differences in ionic radius, valence state, and formation energy, the substitution sites of Cr3+ ions are discussed in detail. The optimized doping concentration of Cr3+ is determined to be 0.01. Under 517 nm excitation, the La2LiSbO6: 0.01Cr(3+) phosphor presents a wide emission band (from 700 to 1350 nm) with a peak centered at 952 nm. Additionally, its corresponding full width at half-maximum is 155 nm, and the internal quantum efficiency reaches 62.4%. Meanwhile, the emission intensity of the La2LiSbO6: 0.01Cr(3+) phosphor at 373 K is about 63.7% of that at room temperature, exhibiting good thermal stability. Aiming to fabricate a near-infrared phosphor-converted light-emitting diode device, the La2LiSbO6 0.01Cr(3+) phosphor is mixed with epoxy adhesive and cured on a green light-emitting diode chip. Under the irradiation of the fabricated light-emitting diode device, fruits and writing in the dark environment can be captured by a near-infrared camera. Hence, the La2LiSbO6: 0.01Cr(3+) phosphor is promising for night vision.

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