Hydrofluoric Acid-Free Broadband Near-Infrared Phosphors K2LiMF6:Cr3+ with Zero-Thermal Quenching: Structure, Luminescence, and Application

• DOI: 10.1021/acsami.4c09500
• Publication Date: 2024-08-29T19:18:45Z
• Authors: Yongqi Zhu; Yifan Yang; Shuang Wu; Yiwen Zhu; Xinyue Li; Qinan Mao; Yifan Chen; Rui Shi; Jiasong Zhong; Jing Wang
• Keywords: Hydrofluoric acid; Zero (linguistics)

Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are considered promising light sources for night vision, food analysis, biomedicine, and plant growth. Yet, the application potential of this technology is vulnerable to function degradation phosphors used, such as thermal quenching, which needs be addressed urgently. Herein, NIR K2LiMF6:Cr3+ (M = Al, Ga, In) with a cubic double-perovskite structure synthesized by green hydrofluoric acid-free hydrothermal method exhibit outstanding stability. Under 450 nm excitation, as-synthesized all exhibited broadband emission covering 650–1000 peaking at 755–780 nm. The prepared K2LiAlF6:Cr3+ phosphor shows unique zero-thermal quenching performance (I423 K/I298 K 102%). comprehensive effects wide band gap, large energy barrier, weak electron–phonon coupling effect, high structural rigidity responsible suppression in material. output power pc-LED device reached 285 mW 100 mA. This series has promise vision bioimaging applications.