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Hydrothermal Method Synthesis and Characterization of YVO4:Eu3+@YPO4 Core-shell Phosphor

Author(s): WU Ke, WANG Le, XU Guo-Tang, ZOU Shi-Bi, HUANG Jie, GU Pei-Fu, LIANG Pei

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 27;
Issue: 7;
Start page: 706;
Date: 2012;
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Keywords: phosphor; nano core-shell structure; hydrothermal synthesis

In order to improve the stability and luminous efficiency of YVO4:Eu3+ phosphor, YVO4:Eu3+@YPO4 nano core-shell phosphor was prepared by using hydrothermal method. X-ray diffraction (XRD), transmission electron microscope (TEM), and photoluminescence spectra were used to characterize the feature of YVO4:Eu3+@YPO4 core-shell phosphor. The XRD and TEM results indicate that the synthetic products are composed of the YVO4:Eu3+ core and YPO4 shell. The core-shell phosphor with diameter of 10–30 nm and shell thickness of 5–10 nm, regular crystalline morphologies, highly uniform in size and distribution, high degree of crystallinity. The photoluminescence spectra show that the luminous efficiency of YVO4:Eu3+@YPO4 core-shell phosphor is 66.75% higher than that of YVO4:Eu3+ phosphor, which also has high color purity. Furthermore, the first principle calculation is used to calculate the band-structure of the YVO4 and YPO4 crystals. On base of the calculated result, the relationship between the electron transition and the luminance is illustrated.

Tango Jona
Tangokurs Rapperswil-Jona

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