Laser‐Driven (Ga/Sc)₂O₃:Cr³⁺ Luminescent Ceramics Enabling Near‐Infrared Light Source for Noninvasive Imaging and Detection

Abstract

Abstract High‐power broadband near‐infrared (NIR) light sources have received extensive attention in long‐distance night vision lighting, non‐invasive detection and imaging, and quantitative analysis of organic components. However, developing targeted NIR‐emitting phosphors with high external quantum efficiency (EQE) and thermal stability remains a challenge to raise the NIR output power and expand the applications. Herein, Ga 1.98− x Sc x O 3 :0.02Cr 3+ luminescent ceramics are prepared with redshifted emission peaks from 710 to 820 nm depending on the weakened crystal field. The optimized Ga 1.18 Sc 0.8 O 3 :0.02Cr 3+ ceramic exhibits a high EQE of 79.6% and excellent thermal stability ( I 423 K / I 298 K = 72%) under 468 nm excitation, which brings a saturation threshold up to 893 mW@3 W mm −2 under 450 nm laser pumping. The high‐power laser‐driven broadband NIR light source demonstrates potential in non‐invasive detection and quantitative analysis of alcohol concentration. This study opens up new avenues for the exploration of high‐power broadband NIR light sources.