Achieving Ultra-Wideband NIR-II Emission in Cr3+-Doped Li(Sc,In)(Si,Ge)O4 Phosphors Based on Host Composition Engineering

Jiahui Zhang; Wenjing Huang; Jiaqi Fan; Weiying Zhou; Zhan-Chao Wu; Chunyan Zhou; Liya Zhou; Qiang Xiao; Xinguo Zhang

doi:10.1021/acs.inorgchem.3c02518

Achieving Ultra-Wideband NIR-II Emission in Cr³⁺-Doped Li(Sc,In)(Si,Ge)O₄ Phosphors Based on Host Composition Engineering

Inorg Chem. 2023 Sep 4;62(35):14494-14503. doi: 10.1021/acs.inorgchem.3c02518. Epub 2023 Aug 23.

Authors

Jiahui Zhang¹, Wenjing Huang¹, Jiaqi Fan¹, Weiying Zhou¹, Zhan-Chao Wu², Chunyan Zhou³, Liya Zhou⁴, Qiang Xiao⁵, Xinguo Zhang¹

Affiliations

¹ Key Laboratory of Drug Metabolism Research and Evaluation of the State Drug Administration, Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China.
² Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, Ministry of Education, Key Laboratory of Biochemical Analysis, Shandong Province, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
³ College of Pharmaceutical Science, Guangxi Medical University, Nanning 530021, China.
⁴ School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.
⁵ Department of Pulmonary and Critical Care Medicine, Shunde Hospital, Southern Medical University, Foshan 528300, China.

PMID: 37611183
DOI: 10.1021/acs.inorgchem.3c02518

Abstract

Realizing ultra-wideband and tunable near-infrared (NIR) emission remains a great challenge in NIR phosphor development. The luminescence of most reported NIR phosphors exhibits a peak wavelength shorter than 1000 nm and the corresponding FWHM is <200 nm. Here, a series of Cr³⁺-activated Li(Sc,In)(Si,Ge)O₄ phosphors with ultra-wideband and tunable NIR-II emission are successfully developed based on the host composition engineering strategy. Significant spectral engineering in the NIR-II region is achieved with a peak wavelength changing from 1110 to 1253 nm. The olivine host structure could provide Cr³⁺ activator a highly distorted octahedral site with very weak crystal field strength, which results in NIR-II ultra-wideband emission with FWHM > 300 nm. A detailed discussion on the relationship between structural variation, crystal field splitting, and NIR luminescence has been applied. As far as we know, it is the first report about Cr³⁺ NIR luminescence engineering in such a long wavelength and wide range. The application of these NIR-II phosphors is demonstrated in intensity-based luminescent thermometry with a relative sensitivity of >2.0% K^-1 in the physiological temperature range.