Efficient and Broadband LiGaP<sub>2</sub>O<sub>7</sub>:Cr<sup>3+</sup> Phosphors for Smart Near‐Infrared Light‐Emitting Diodes
Chenxu Yuan, Ruiyang Li, Yongfu Liu, Liangliang Zhang, Jiahua Zhang, Grzegorz Leniec, Peng Sun, Zehua Liu, Zhaohua Luo, Rui Dong, Jun Jiang
Abstract
Abstract Broadband near‐infrared (NIR) phosphor‐converted (pc) LED is promising next‐generation tiny light source for smart and broadband NIR spectroscopy technology. However, NIR phosphors suffer from challenges in terms of low quantum efficiency and bandwidth. By selecting a host that has a big bandgap and weakening coupling effect among Cr 3+ , a novel LiGaP 2 O 7 :Cr 3+ (LGAP:Cr 3+ ) NIR phosphor that has a high external quantum efficiency (28.3%) is discovered. Under ≈450 nm excitation, LGAP:Cr 3+ shows broad NIR emission from 700 to 1100 nm with a bandwidth of ≈170 nm. Importantly, the fabricated pcLED demonstrates bright broadband NIR light and an excellent performance in night vision. The results promise the use of the LGAP:Cr 3+ phosphor for high‐performance broadband NIR LED that employs only one tiny blue LED chip.