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Title: Synthesis and photoluminescence of (Y{sub 0.9−x}La{sub x})Eu{sub 0.1}VO{sub 4} nano-crystal phosphors using a sol–gel method

Graphical abstract: Emission spectra and CIE chromaticity diagram of the (Y{sub 0.9−x}La{sub x})Eu{sub 0.1}VO{sub 4} phosphor. - Highlights: • The CIE chromaticity of (Y{sub 0.75}La{sub 0.15})Eu{sub 0.1}VO{sub 4} phosphor is (0.66, 0.34). • The D{sub 0} → {sup 7}F{sub 2} transition intensity increases about five times for the 15 mol% of La{sup 3+} ion doping. • The (Y{sub 0.75}La{sub 0.15})Eu{sub 0.1}VO{sub 4} may be suitable for use as a UV-LED converted phosphor. - Abstract: The (La, Eu) co-doped YVO{sub 4} with nano-crystal phosphors were prepared using a sol–gel method. The X-ray diffraction profiles show that all of the peaks are attributed to the YVO{sub 4} phase when co-doped with the (La{sup 3+}, Eu{sup 3+}) ions. The intensities of the diffraction peaks decreases when the La{sup 3+} ion concentrations increase. In addition, under an excitation of 318 nm, the {sup 5}D{sub 0} → {sup 7}F{sub 2} transition intensity increased with increasing the La{sup 3+} ion concentration, and increased about five with the 15 mol% of La{sup 3+} ion doping. This is caused by the large difference in ion radius between the La{sup 3+} and Y{sup 3+} ions, which leads to a distorted lattice and a local nonuniform strain in the vicinitymore » of the Eu{sup 3+} ions when La{sup 3+} ions substitute Y{sup 3+} ions in the (Y{sub 0.9−x}La{sub x})Eu{sub 0.1}VO{sub 4} system. The bright red emission of the (Y{sub 0.9}Eu{sub 0.1})VO{sub 4} phosphor has the CIE chromaticity coordinates of (0.66, 0.34) with 15 mol% La{sup 3+} ion doping, which is very close to the NTSC system standard red chromaticity coordinates of (0.67, 0.33)« less
Authors:
 [1] ;  [2]
  1. Department of Electronic Engineering, Kao Yuan University, Lujhu, Kaohsiung 821, Taiwan (China)
  2. Department of Electronic Engineering, National Formosa University, Huwei, Yunlin 632, Taiwan (China)
Publication Date:
OSTI Identifier:
22290473
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 48; Journal Issue: 7; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTALS; DOPED MATERIALS; EMISSION SPECTRA; EUROPIUM IONS; INDIUM IONS; LANTHANUM IONS; OPTICAL PROPERTIES; PHOSPHORS; PHOTOLUMINESCENCE; SYNTHESIS; VANADATES; X-RAY DIFFRACTION; YTTRIUM IONS