Improved thermal stability of luminescence by anion modification in Na2Y(MoO4)(PO4):Tb3+,Eu3+ red-emitting phosphors

被引：25

作者：

Guo, Zhenbin ^{[1
]}

Milicevic, Bojana ^{[1
,2
]}

Feng, Jiajun ^{[1
,2
]}

Zhou, Lei ^{[1
,2
]}

Yao, Fen ^{[1
,2
]}

Huang, Senchuan ^{[1
,2
]}

Wu, Zhan-Chao ^{[3
]}

Khan, Wasim Ullah ^{[1
,2
]}

Shi, Jianxin ^{[1
]}

Wu, Mingmei ^{[1
,2
]}

机构：

[1] Sun Yat Sen Univ, Sch Chem, MOE Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Peoples R China

[2] Sun Yat Sen Univ, Sch Marine Sci, Zhuhai 519082, Peoples R China

[3] Qingdao Univ Sci & Technol, State Key Lab Base Ecochem Engn, Lab Inorgan Synth & Appl Chem, Coll Chem & Mol Engn, Qingdao 266042, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 837卷

基金：

中国国家自然科学基金;

关键词：

Thermal stability; Lattice rigidity; Anion modification; Red-emitting phosphor; WLEDs; ENERGY-TRANSFER; CRYSTAL-STRUCTURE; IN-GLASS; ELECTRONIC-STRUCTURE; CATION SUBSTITUTION; STRUCTURAL RIGIDITY; NITRIDE PHOSPHOR; FACILE SYNTHESIS; PURE RED; PHOTOLUMINESCENCE;

D O I：

10.1016/j.jallcom.2020.155438

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Polyhedral anions have been used as supporting host structure to improve the luminescent properties of phosphors. However, the underlying mechanism for improving the thermal stability of luminescence by anion modification is rarely studied. In this paper, it was reported for the first time that thermal quenching and luminescent properties of red-emitting phosphors, Na2-nY(MoO4)(1+n)(PO4)(1-n)Tb3+,Eu3+, can be adjusted by the ratio of acid radicals. Rietveld refinements and Debye temperature calculations show that the subtle replacement of [MoO4](2-) by [PO4](3-) results in the shrinkage of the crystal lattice and an improvement in lattice rigidity of the host, but does not change the crystal type. A detailed explanation of the mechanism for adjustable thermal stability of luminescence is provided via temperature-dependent X-ray diffraction, Raman, formation energy, and work function. The strategy of anion modification reveals an effective method for improving the thermal stability and tuning the luminescent spectra of phosphors, it also sheds light on the development of new phosphors. Furthermore, Na1.4Tb0.5(MoO4)(1.6)(PO4)(0.4):0.5Eu(3)(+) red-emitting phosphor with an internal quantum efficiency of 66.67% can be efficiently excited with blue light (465 nm) and the integrated intensity at 425 K is 86.4% of that at 300 K. The controllable local structure-dependent luminescence makes this novel red-emitting phosphor attractive for both blue and near-UV chips based WLEDs. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：10

共 105 条

[11] Realizing efficient Mn2+ red emission via synergistic sensitization of Eu2+ and Tb3+ for white light-emitting diodes [J].