A novel Eu3+‐ and self‐activated vanadate phosphor of Ca4La(VO4)3O with oxyvanadate apatite structure |
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| Authors: | Ruijin Yu Jung Hyun Jeong Yin‐Feng Wang |
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| Affiliation: | 1. College of Chemistry & Pharmacy, Northwest A&F University, Yangling, Shaanxi, China;2. Department of Physics, Pukyong National University, Busan, Korea;3. Jiangxi Province Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Jinggangshan University, Ji'an, Jiangxi, China |
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| Abstract: | Pure and Eu3+‐activated Ca4La(VO4)3O 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. Ca4La(VO4)3O is a new vanadate optical material with a direct band feature and a band energy of 3.1 eV. The undoped Ca4La(VO4)3O phosphor presents self‐activated yellow luminescence from 400 nm to 750 nm with a maximum wavelength of 525 nm originating from VO4 groups. Luminescence characteristics of Ca4La(VO4)3O indicate that the phosphor is not sufficient for practical applications. In Eu3+‐activated Ca4La(VO4)3O, there is an efficient energy transfer from VO4 to Eu3+ ions. The luminescence spectra, concentration quenching, decay curves, color chromaticity, and quantum efficiencies (QE) of Ca4La(VO4)3O:Eu3+ were investigated. The phosphor presents optimal Eu3+ doping concentration of about 20 mol%. The dominant red emission in Ca4La(VO4)3O:Eu3+ is 615 nm from electronic 5D0→7F2 dipole transitions. The quantum efficiency and the luminescence stability of the pure and Eu‐activated Ca4La(VO4)3O were reported. The luminescence was discussed on the structural characteristics. |
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| Keywords: | apatite Eu3+ optical materials and properties photoluminescence vanadate |
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