Abstract
A novel series of color-tunable single-phased phosphors La1–x–y PO4:xEu3+/yTb3+(x=0, 0.01, 0.02, 0.03, 0.04, 0.05; y=0, 0.05, 0.10, 0.15, 0.20) was synthesized via co-precipitation method with diammonium hydrogen phosphate as precipitant. The morphology, crystal structure and photoluminescence properties of the as-prepared samples were characterized by means of X-ray diffraction(XRD), scanning electron microscopy(SEM) and fluorescence spectrophotometer. The results reveal that the as-synthesized samples calcined at 1100 °C display spherical morphology with uniform distribution. Upon excitation with 350 nm ultraviolet radiation, the LaPO4:Eu3+/Tb3+ phosphors showed a green light peaking at 543 nm assigned to the characteristic 5 D 4-7 F 5 emission of Tb3+ and a red light peaking at 591 nm corresponding to the characteristic 5D0-7 F 1 emission of Eu3+ simultaneously. For the Eu3+/Tb3+ co-activated phosphors, Tb3+ acts as an efficient sensitizer to enhance the emission intensity of Eu3+ ions. The energy transfer mechanism and the emission color tunability of LaPO4:Eu3+/Tb3+ have been studied. The results indicate that a color-tunable luminescence(from green to white to red) can be achieved by adjusting the Eu3+/Tb3+ doping ratio in the LaPO4 host matrix.
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Supported by the National Natural Science Foundation of China(No.50772016).
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Dong, W., Zhang, X., Shi, H. et al. Preparation and luminescence properties of color-tunable single-phased LaPO4:Eu3+/Tb3+ phosphors. Chem. Res. Chin. Univ. 32, 248–252 (2016). https://doi.org/10.1007/s40242-016-5407-0
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DOI: https://doi.org/10.1007/s40242-016-5407-0