Broadband La<sub>2</sub>LiSbO<sub>6</sub>: Cr<sup>3+</sup> 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
Abstract
The La 2 LiSbO 6: x Cr 3+ 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 Cr 3+ ions are discussed in detail. The optimized doping concentration of Cr 3+ is determined to be 0.01. Under 517 nm excitation, the La 2 LiSbO 6: 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 La 2 LiSbO 6: 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 La 2 LiSbO 6: 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 La 2 LiSbO 6: 0.01Cr 3+ phosphor is promising for night vision.