Cr<sup>3+</sup>‐Yb<sup>3+</sup>‐Ni<sup>2+</sup> Tri‐Doped NIR Phosphors with Spectral Output Covering NIR‐I and NIR‐II Regions
Lipeng Jiang, Liangliang Zhang, Xue Jiang, Jihuan Xie, Guocai Lv, Yanjing Su
Abstract
Abstract To realize efficient and broadband near infrared (NIR) light in both NIR‐I and NIR‐II regions, Gd 3 Mg 0.5 Al 1.5 Ga 2.5 Ge 0.5 O 12 (GMAGG): Cr 3+ , Yb 3+ , Ni 2+ phosphors are prepared in this study. The effects of Cr 3+ ‐Yb 3+ co‐doping and Cr 3+ ‐Yb 3+ ‐Ni 2+ tri‐doping on the luminescence properties are investigated. GMAGG: Cr 3+ , Yb 3+ exhibits high internal quantum efficiency (IQE) of 96.4%, and near‐zero thermal quenching (96.5%@423 K) in 650–1100 nm. By constructing energy transfer from Cr 3+ to Ni 2+ , the emission range of GMAGG: Cr 3+ , Yb 3+ , Ni 2+ is further extended to 650–1700 nm with a high IQE of 28% and good thermal stability (66%@423 K). The NIR LEDs prepared with GMAGG: 0.04Cr 3+ , 0.008Yb 3+ , and GMAGG: 0.04Cr 3+ , 0.008Yb 3+ , 0.04Ni 2+ exhibit 57.5 and 8.1 mW at an input current of 100 mA, respectively. The results show that GMAGG: Cr 3+ , Yb 3+ , Ni 2+ is a promising NIR phosphor for NIR light sources.