Thermally Stable CaLu<sub>2</sub>Mg<sub>2</sub>Si<sub>3</sub>O<sub>12</sub>:Cr<sup>3+</sup> Phosphors for NIR LEDs
Ruiyang Li, Yongfu Liu, Chenxu Yuan, Grzegorz Leniec, Lijing Miao, Peng Sun, Zehua Liu, Zhaohua Luo, Rui Dong, Jun Jiang
Abstract
Abstract Near‐infrared (NIR) phosphor‐converted (pc) light‐emitting diode (LED) is a promising next‐generation tiny light source for smart and broadband NIR spectroscopy technology. However, NIR phosphors suffer from challenges in terms of low efficiency and thermal stability. Herein, by selecting a host with large bandgap and weakening the coupling effect to Cr 3+ , the novel CaLu 2 Mg 2 Si 3 O 12 :Cr 3+ (CLMSG:Cr 3+ ) NIR phosphor is discovered that has an external quantum efficiency of 20.7% and high thermal stability (92.1%@100 °C). Under ≈450 nm excitation, CLMSG:Cr 3+ shows broad NIR emission from 650 to 900 nm with a band width of ≈120 nm. The fabricated tiny pcLED demonstrates bright NIR light (34.75 mW@100 mA) with photoelectric efficiency of 11.6%.