Ultra-broad NIR emission from two-site Cr3+occupation in fluoride phosphor via composition-driven structural transformation

被引：29

作者：

Nie, W. . D. ^{[1
,3
]}

Zuo, J. . X. ^{[1
,3
]}

Yang, S. ^{[1
,3
]}

Li, Y. ^{[1
,3
]}

Zou, W. F. ^{[1
,3
]}

Chen, G. ^{[1
,3
]}

Wu, S. H. ^{[1
,3
]}

Wu, D. ^{[1
,3
]}

Liu, S. B. ^{[1
,3
]}

Peng, J. Q. ^{[1
,3
]}

Han, L. ^{[1
,3
]}

Ye, X. Y. ^{[1
,2
,3
,4
]}

机构：

[1] Jiangxi Univ Sci & Technol, Coll Rare Earths, Ganzhou 34100, Peoples R China

[2] Natl Engn Res Ctr Ion Rare Earth, Ganzhou 341000, Peoples R China

[3] Jiangxi Univ Sci & Technol, Key Lab Rare Earth Luminescence Mat & Devices Jian, Ganzhou 341000, Peoples R China

[4] Nation Rare Earth Funct Mat Mfg Innovat Ctr, Ganzhou 341000, Peoples R China

来源：

MATERIALS TODAY CHEMISTRY | 2022年 / 26卷

基金：

中国国家自然科学基金;

关键词：

Near -infrared light source; Broadband emission; Electron -phonon coupling; Luminescence efficiency; NEAR-INFRARED EMISSION; PHOTOLUMINESCENCE; YB; ND; LN;

D O I：

10.1016/j.mtchem.2022.101164

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Cr3+-activated fluoride-based near-infrared (NIR) phosphors have attracted wide attention from re-searchers due to their high luminous efficiency and high thermal stability. However, the practical application of this type of phosphors is severely hindered by their narrow emission. In this work, a structural transformation from Li3GaF6 to LiMgGaF6 was successfully obtained by stoichiometric control during hydrothermal process, leading to an NIR phosphor LiMgGaF6:Cr3+ with broadband emission ranging from 650 to 1150 nm. With the replacement of Li by Mg atom of Li3-2xMgxGaF6:Cr3+(0 <= x <= 1), the full width at half maximum of emission band can be broaden to 189.9 nm from 140 nm. This ultra -wide NIR emission of fluoride phosphor is caused by double-site Cr3+ occupation, which is verified by activator concentration-dependent spectra, Rietveld structural refinement, and density functional theory first-principles calculations. Despite the wide-band NIR emission, the LiMgGaF6:Cr3+ phosphor shows relatively high quantum efficiency of 42.3% and high thermal stability, which maintains 50% of its initial intensity at 400 K. The ultra-broadband NIR emission of LiMgGaF6:Cr3+ has potential applications as a light source in ingredient identification, and the strategy of multisite occupation of Cr3+ through compositional regulation opens a new way for the exploration of Cr3+-doped broadband NIR fluoride phosphors.(c) 2022 Elsevier Ltd. All rights reserved.

引用

页数：9

共 41 条

[11] A General Ammonium Salt Assisted Synthesis Strategy for Cr3+-Doped Hexafluorides with Highly Efficient Near Infrared Emissions [J].