Photoluminescence characteristics and energy transfer mechanism of Eu3+:NaY(WO4)2 microparticles
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A series of red emitting phosphors Eu3+:NaY(WO4)2 were successfully synthesized through conventional hydrothermal reactions. Meanwhile, the photoluminescence characteristics of Eu3+:NaY(WO4)2 microparticles were detailedly discussed. The XRD measurements demonstrate that all products exhibited pure phase as NaY(WO4)2 and doping Eu3+ ions did evoke change the crystal parameters of matrix material. The SEM and TEM images show that the particle morphology was quasi-cubes with uniform appearance and the size was about 3–4 µm. Microparticles of Eu3+:NaY(WO4)2 can observe emissions located at 594 nm and 618 nm while excited by near-UV (249 nm) and near-IR (797 nm). And the energy transfer mechanism between Eu3+ was proved to be electric dipole–dipole (d–d) interaction as well as the critical distance was calculated to be 9.936 Å. What’s more, the phonon sideband spectra of Eu3+ ions was used to calculated Huang-Rays factor and analyze the phonon energy. Subsequently, for self-generated quenching process of Eu3+ occurs was well explained according to Auzel’s theoretical model. Besides, the CIE color coordinates of Eu3+:NaY(WO4)2 phosphors exhibited the ideal red chromaticity.
This work was supported by the National Key Research and Development Program of China (2017YFB0310300), National Natural Science Foundation of China (51274052), Natural Science Foundation of Liaoning Province (201602134), Project supported by Department of Education Liaoning Province (JDL2016002).
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