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A novel Eu 3+ ‐ and self‐activated vanadate phosphor of Ca 4 La(VO 4 ) 3 O with oxyvanadate apatite structure
Author(s) -
Yu Ruijin,
Jeong Jung Hyun,
Wang YinFeng
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15102
Subject(s) - phosphor , luminescence , vanadate , chromaticity , analytical chemistry (journal) , materials science , doping , quantum efficiency , rietveld refinement , apatite , crystal structure , crystallography , chemistry , mineralogy , inorganic chemistry , optics , physics , optoelectronics , chromatography
Pure and Eu 3+ ‐activated Ca 4 La(VO 4 ) 3 O phosphors were prepared via three‐step solid‐phase synthesis. The phase formation and structure were investigated by X‐ray diffraction (XRD) with Rietveld refinements. All the samples crystallized in an apatite‐type structure. The morphological properties were measured via by SEM and EDS measurements. Ca 4 La(VO 4 ) 3 O is a new vanadate optical material with a direct band feature and a band energy of 3.1 eV. The undoped Ca 4 La(VO 4 ) 3 O phosphor presents self‐activated yellow luminescence from 400 nm to 750 nm with a maximum wavelength of 525 nm originating from VO 4 groups. Luminescence characteristics of Ca 4 La(VO 4 ) 3 O indicate that the phosphor is not sufficient for practical applications. In Eu 3+ ‐activated Ca 4 La(VO 4 ) 3 O, there is an efficient energy transfer from VO 4 to Eu 3+ ions. The luminescence spectra, concentration quenching, decay curves, color chromaticity, and quantum efficiencies (QE) of Ca 4 La(VO 4 ) 3 O:Eu 3+ were investigated. The phosphor presents optimal Eu 3+ doping concentration of about 20 mol%. The dominant red emission in Ca 4 La(VO 4 ) 3 O:Eu 3+ is 615 nm from electronic 5 D 0 → 7 F 2 dipole transitions. The quantum efficiency and the luminescence stability of the pure and Eu‐activated Ca 4 La(VO 4 ) 3 O were reported. The luminescence was discussed on the structural characteristics.