Tunable luminescence and energy transfer properties in YVO.sub.4:Bi.sup.3+, Eu.sup.3+ phosphors

• Published in: Journal of materials science Vol. 52; no. 2; pp. 782 - 792
• Main Authors: Su, Jiangang, Mi, Xiaoyun, Sun, Jiacheng, Yang, Lixin, Hui, Chunlong, Lu, Liping, Bai, Zhaohui, Zhang, Xiyan
• Format: Journal Article
• Language: English
• Published: Springer 01.01.2017
• Subjects: Diffraction; Light-emitting diodes; Photoluminescence; X-rays
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-016-0375-9

In this paper, YVO.sub.4:Bi.sup.3+, Eu.sup.3+ phosphors have been synthesized by high-temperature solid-state method. The samples were characterized by X-ray powder diffraction, photoluminescence spectra, luminescence lifetime, and GSAS structure refinement. The excitation spectrum of YVO.sub.4:Bi.sup.3+, Eu.sup.3+ monitoring at 622 nm was a broad band with major peak located at 280 nm. It contained the charge transfer from 2p orbit of O.sup.2- to 4f orbit of Eu.sup.3+ (257 nm) and the absorbing from energy level transition of Bi.sup.3+ (.sup.1S.sub.0→.sup.3P.sub.1, 346 nm) and VO.sub.4.sup.3- (.sup.lA.sub.1→.sup.1T.sub.2, 286 nm and .sup.lA.sub.1→.sup.1T.sub.1, 320 nm) through gauss fitting. Upon excitation at a wavelength of 280 nm, the major emission peak of YVO.sub.4:Bi.sup.3+, Eu.sup.3+ located at 622 nm (red) was attributed to the electric dipole transition .sup.5D.sub.0→.sup.7F.sub.2 of Eu.sup.3+. The energy transfer mechanism of Bi.sup.3+→Eu.sup.3+ was also studied to be dipole-quadrupole mechanism of electric multipole interaction, and the critical distance between Eu.sup.3+ and Bi.sup.3+ was calculated by concentration quenching method. The emission color of YVO.sub.4:Bi.sup.3+, Eu.sup.3+ can be tuned by the energy transfer of ions and the concentration of activator. In a word, the material has a good application prospects in the field of light-emitting diode under ultraviolet excitation.