Jie Fu,Yanling Chen,Jianhua Lin,Renguang Ye,Lei Lei,Yang Shen,Degang Deng,Shiqing Xu
Bi 3+ , Eu 3+ co-doped Ba 2 Y 2 Si 4 O 13 phosphors with multi-color luminescence properties were prepared by high temperature solid state method. The structure, luminescent properties and temperature characteristics were studied by X-ray diffraction, scanning electron microscope, fluorescence spectrum and temperature-dependence of emission spectrum. Ba 2 Y 2 Si 4 O 13 : Bi 3+ , Eu 3+ phosphors can emit color from cyan to red when the excitation wavelength was changed from 340 nm to 390 nm, which is attributed to that there are two Bi 3+ ion emission centers, and their emission intensity will change with the change of excitation wavelength. Moreover, the emission of the phosphor has good temperature sensing characteristics, based on the fluorescence intensity ratio of the two blue emission bands of Bi 3+ and the red emission peak of Eu 3+ , a multimode thermometer with high temperature sensitivity was constructed. At the same time, based on the dynamic luminescence characteristics of the phosphor, the dynamic anti-counterfeiting experiments are designed. Therefore, the results show that the material has a bright prospect in the field of temperature sensing and anti-counterfeiting.
Single-composition Ba 2 Y 2 Si 4 O 13 :Bi 3+ ,Eu 3+ (BYSO:Bi 3+ ,Eu 3+ ) phosphors with color-tunable and white emission were prepared by conventional high temperature solid-state reaction method. The structural and luminescent properties of these phosphors were thoroughly investigated through X-ray diffraction, photoluminescence, and decay curves. BYSO:Bi 3+ phosphors show two excitation peaks at 342 and 373 nm, and give two emission peaks at 414 and 503 nm, respectively, indicating that there are two sites of Bi 3+ in BYSO. The energy transfer from Bi 3+ to Eu 3+ was investigated in detail. Varied hues from blue (chromaticity coordinate [0.219, 0.350]) to white (0.288, 0.350) and orange-red light (0.644, 0.341) can be generated by adjusting the content of Eu 3+ . Pure white light emission (0.311, 0.338) can be obtained under the excitation of 355 nm in BYSO:3%Bi 3+ ,20%Eu 3+ phosphor. Besides, BYSO:Bi 3+ ,Eu 3+ phosphors exhibit distinct thermal quenching properties, whose emission intensity at 473 K is 82.6% of that at 298 K. Our results indicate that BYSO:Bi 3+ ,Eu 3+ may be applied as conversion phosphors for n-UV-based W-LEDs.
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