CaLu<sub>2</sub>Mg<sub>2</sub>Si<sub>3</sub>O<sub>12</sub>:Ce<sup>3+</sup>, Cr<sup>3+</sup>, Nd<sup>3+</sup> Phosphor‐In‐Glass Film for Laser‐Driven Ultra‐Broadband Near‐Infrared Lighting with Watt‐Level Output
Yi Lin, Hang Lin, Pengfei Wang, Ju Xu, Yao Cheng, Yuansheng Wang
Abstract
Abstract Laser diode (LD)‐pumped phosphor‐converted near‐infrared (NIR) lighting source predicts a “brighter” future for active imaging and non‐destructive detection, with improved imaging resolution and detection accuracy to expand more application scenarios. To meet a variety of requirements for LD‐pumped phosphor color converters, herein, a novel CaLu 2 Mg 2 Si 3 O 12 :Ce 3+ , Cr 3+ , Nd 3+ (CLMS:Ce 3+ , Cr 3+ , Nd 3+ ) phosphor‐in‐glass film (PiGF) sintered on sapphire substrate (SP) composite is fabricated. By introducing a rapid infrared firing technique, the good luminescence properties of phosphor powders are maintained in the PiGF due to the trivial thermally‐aggressive effect of glass components on phosphor particles. The multiple energy transfers (ETs) among Ce 3+ , Cr 3+ , and Nd 3+ enhance the NIR luminescence of Cr 3+ and Nd 3+ , and simultaneously extend the spectral range to cover the NIR‐I and NIR‐II regions. The luminescent behaviors of samples are carefully examined under different laser excitation modes to gain more insights into laser‐matter interaction. A watt‐level output is achieved by applying appropriate thermal and optical management. A comparative study is performed on the luminescence saturation mechanism of CLMS:Ce 3+ , Cr 3+ , Nd 3+ PiGF showing different contributions of thermal quenching and intensity quenching among these three ions. Finally, the application presentations confirm the great potential in the fields of long‐distance night vision and high‐resolution biological imaging.