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

Yi Zhang; Zhexuan Gao; Yingguang Li; Shuyang Chen; Mingxiao Han; Jie Li; Qihao Zhang; Yang Shen; Degang Deng; Shiqing Xu

doi:10.1021/acs.inorgchem.3c02686

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

Inorg Chem. 2023 Oct 23;62(42):17371-17381. doi: 10.1021/acs.inorgchem.3c02686. Epub 2023 Oct 10.

Authors

Yi Zhang¹, Zhexuan Gao¹, Yingguang Li¹, Shuyang Chen¹, Mingxiao Han¹, Jie Li¹, Qihao Zhang¹, Yang Shen¹, Degang Deng¹, Shiqing Xu¹

Affiliation

¹ Key Laboratory of Rare Earth Optoelectronic Materials and Devices of Zhejiang Province, Institute of Optoelectronic Materials and Devices, China Jiliang University, Hangzhou 310018, P. R. China.

PMID: 37816214
DOI: 10.1021/acs.inorgchem.3c02686

Abstract

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: 0.01Cr³⁺ 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: 0.01Cr³⁺ 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: 0.01Cr³⁺ 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: 0.01Cr³⁺ phosphor is promising for night vision.