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

Ye Yang; Zuizhi Lu; Hua Fan; Mianhong Chen; Linawa Shen; Xinguo Zhang; Qi Pang; Jianhua Chen; Peican Chen; Liya Zhou

doi:10.1021/acs.inorgchem.2c04347

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

Inorg Chem. 2023 Feb 27;62(8):3601-3608. doi: 10.1021/acs.inorgchem.2c04347. Epub 2023 Feb 15.

Authors

Ye Yang¹, Zuizhi Lu¹, Hua Fan², Mianhong Chen¹, Linawa Shen¹, Xinguo Zhang³, Qi Pang¹, Jianhua Chen⁴, Peican Chen^{1

5}, Liya Zhou^{1

5}

Affiliations

¹ School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.
² College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China.
³ Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China.
⁴ Guangxi Key Laboratory of Processing for Non-Ferrous Metal and Featured Materials, Guangxi University, Nanning 530004, China.
⁵ Guangxi Key Laboratory of Electrochemical Energy Materials, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.

PMID: 36790893
DOI: 10.1021/acs.inorgchem.2c04347

Abstract

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.