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Title: Excellent red phosphors of double perovskite Ca{sub 2}LaMO{sub 6}:Eu (M=Sb, Nb, Ta) with distorted coordination environment

Abstract

Double perovskite Ca{sub 2}LaSbO{sub 6}, successfully synthesized by solid state reaction method, was identified by Rietveld refinements to crystallize in the monoclinic space group P2{sub 1}/n, which is isostructural to Ca{sub 2}LaMO{sub 6} (M=Nb, Ta). Excellent red luminescence of Eu-doped Ca{sub 2}LaMO{sub 6} (M=Sb, Nb, Ta) can be obtained and no luminescence quenching effect was observed when Eu-doping level reached 40%. For Ca{sub 2}La{sub 0.6}NbO{sub 6}:0.4Eu{sup 3+}, quantum efficiencies of 20.9% and 27.7% were reached to show high light conversion and bright red emission excited at 465 nm (blue light) and 534 nm (green light), respectively, comparable to the commercial phosphors. Through systemic investigation for the series of double perovskite compounds, the excellent red emission in Ca{sub 2}LaMO{sub 6} is attributed to highly distorted polyhedra of EuO{sub 8} (low tolerance factor of the pervoskite), and large bond distances of La-O (low crystal field effect of the activator). - Graphical Abstract: Eu{sup 3+} doped double-perovskite compounds A{sub 2}LnMO{sub 6} (A=Ca, Sr, Ba; Ln=La, Gd, Y; M=Sb, Nb, Ta) show the dependence of luminescence intensity on the crystal structure. Highlights: Black-Right-Pointing-Pointer A series of double perovskite compounds were synthesized by solid state reaction. Black-Right-Pointing-Pointer Eu{sup 3+} doped samples display intense red emissionmore » when excited by blue or green light. Black-Right-Pointing-Pointer High quantum efficiency was obtained, comparable to the commercial phosphors. Black-Right-Pointing-Pointer Luminescence properties were ascribed to crystal distortion and large Ln-O distance.« less

Authors:
;  [1]; ;  [1]
  1. State Key Laboratory of High Performance Ceramics and Superfine Microstructures and CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China)
Publication Date:
OSTI Identifier:
21612835
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 184; Journal Issue: 12; Other Information: DOI: 10.1016/j.jssc.2011.10.032; PII: S0022-4596(11)00574-3; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CRYSTAL FIELD; CRYSTALS; DOPED MATERIALS; EUROPIUM IONS; LUMINESCENCE; MONOCLINIC LATTICES; PEROVSKITE; PHOSPHORS; QUANTUM EFFICIENCY; SOLIDS; SPACE GROUPS; CHARGED PARTICLES; CRYSTAL LATTICES; CRYSTAL STRUCTURE; EFFICIENCY; EMISSION; IONS; MATERIALS; MINERALS; OXIDE MINERALS; PEROVSKITES; PHOTON EMISSION; SYMMETRY GROUPS

Citation Formats

Xin, Yin, Yaoming, Wang, Huang Fuqiang, E-mail: huangfq@mail.sic.ac.cn, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, Yujuan, Xia, Dongyun, Wan, and Yao Jiyong, E-mail: jyao@mail.ipc.ac.cn. Excellent red phosphors of double perovskite Ca{sub 2}LaMO{sub 6}:Eu (M=Sb, Nb, Ta) with distorted coordination environment. United States: N. p., 2011. Web. doi:10.1016/j.jssc.2011.10.032.
Xin, Yin, Yaoming, Wang, Huang Fuqiang, E-mail: huangfq@mail.sic.ac.cn, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, Yujuan, Xia, Dongyun, Wan, & Yao Jiyong, E-mail: jyao@mail.ipc.ac.cn. Excellent red phosphors of double perovskite Ca{sub 2}LaMO{sub 6}:Eu (M=Sb, Nb, Ta) with distorted coordination environment. United States. doi:10.1016/j.jssc.2011.10.032.
Xin, Yin, Yaoming, Wang, Huang Fuqiang, E-mail: huangfq@mail.sic.ac.cn, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, Yujuan, Xia, Dongyun, Wan, and Yao Jiyong, E-mail: jyao@mail.ipc.ac.cn. Thu . "Excellent red phosphors of double perovskite Ca{sub 2}LaMO{sub 6}:Eu (M=Sb, Nb, Ta) with distorted coordination environment". United States. doi:10.1016/j.jssc.2011.10.032.
@article{osti_21612835,
title = {Excellent red phosphors of double perovskite Ca{sub 2}LaMO{sub 6}:Eu (M=Sb, Nb, Ta) with distorted coordination environment},
author = {Xin, Yin and Yaoming, Wang and Huang Fuqiang, E-mail: huangfq@mail.sic.ac.cn and College of Chemistry and Molecular Engineering, Peking University, Beijing 100871 and Yujuan, Xia and Dongyun, Wan and Yao Jiyong, E-mail: jyao@mail.ipc.ac.cn},
abstractNote = {Double perovskite Ca{sub 2}LaSbO{sub 6}, successfully synthesized by solid state reaction method, was identified by Rietveld refinements to crystallize in the monoclinic space group P2{sub 1}/n, which is isostructural to Ca{sub 2}LaMO{sub 6} (M=Nb, Ta). Excellent red luminescence of Eu-doped Ca{sub 2}LaMO{sub 6} (M=Sb, Nb, Ta) can be obtained and no luminescence quenching effect was observed when Eu-doping level reached 40%. For Ca{sub 2}La{sub 0.6}NbO{sub 6}:0.4Eu{sup 3+}, quantum efficiencies of 20.9% and 27.7% were reached to show high light conversion and bright red emission excited at 465 nm (blue light) and 534 nm (green light), respectively, comparable to the commercial phosphors. Through systemic investigation for the series of double perovskite compounds, the excellent red emission in Ca{sub 2}LaMO{sub 6} is attributed to highly distorted polyhedra of EuO{sub 8} (low tolerance factor of the pervoskite), and large bond distances of La-O (low crystal field effect of the activator). - Graphical Abstract: Eu{sup 3+} doped double-perovskite compounds A{sub 2}LnMO{sub 6} (A=Ca, Sr, Ba; Ln=La, Gd, Y; M=Sb, Nb, Ta) show the dependence of luminescence intensity on the crystal structure. Highlights: Black-Right-Pointing-Pointer A series of double perovskite compounds were synthesized by solid state reaction. Black-Right-Pointing-Pointer Eu{sup 3+} doped samples display intense red emission when excited by blue or green light. Black-Right-Pointing-Pointer High quantum efficiency was obtained, comparable to the commercial phosphors. Black-Right-Pointing-Pointer Luminescence properties were ascribed to crystal distortion and large Ln-O distance.},
doi = {10.1016/j.jssc.2011.10.032},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 12,
volume = 184,
place = {United States},
year = {2011},
month = {12}
}