Ultra-Broadband Near-Infrared Phosphors Realized by the Heterovalent Substitution Strategy

作者：Yang, Ye; Lu, Zuizhi; Fan, Hua; Chen, Mianhong; Shen, Linawa; Zhang, Xinguo; Pang, Qi; Chen, Jianhua; Chen, Peican^*; Zhou, Liya^*

来源：Inorganic Chemistry, 2023, 62(8): 3601-3608.

DOI：10.1021/acs.inorgchem.2c04347

• LUMINESCENCE
• PHOTOLUMINESCENCE
• SPECTROSCOPY
• GROWTH

Near-infrared (NIR) phosphor-converted light-emitting diodes with broadband emission have received considerable interest. However, there remains a challenge in the construction of ultra-broadband NIR phosphors, hindering their further application. In this work, a heterovalent substitution strategy is proposed to construct a novel ultra-broadband NIR-emitting LaTiTaO6:Cr3+ phosphor with a full width at half maximum of <^>,300 nm. Crystal structure, time-resolved emission spectroscopy, and electron paramagnetic resonance analyses confirm that only one crystallographic site of Cr3+ with separated ions exists. Electron and phonon coupling (EPC) evaluated by the Huang-Rhys factor (S) reveals that the heterovalent substitution strategy contributes to strong EPC with S = 9.185, resulting in ultra-broadband emission. Interestingly, a remarkable blue shift of emission from 1050 to 922 nm with increasing temperature is observed. Moreover, the application of LaTiTaO6:Cr3+ phosphor is demonstrated in the qualitative analysis of ethanol/water mixtures. The work will enrich the toolbox for designing broadband NIR-emitting materials.

• 单位
  广西大学; 重庆大学; 南方医科大学