Tb3+掺杂透明锗酸盐微晶玻璃:制备与面向X射线探测的增强发光

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通过熔融淬火和后续热处理,成功制备了Tb3+掺杂含LaF3纳米晶透明锗酸盐微晶玻璃.详细研究了所制备的玻璃和微晶玻璃的发光性质.X射线衍射结果表明,玻璃基体中析出的晶相为纯LaF3晶体,晶粒尺寸在16~21 nm之间.在377 nm紫外光和X射线激发下,Tb3+掺杂含LaF3纳米晶的微晶玻璃比Tb3+掺杂的锗酸盐玻璃表现出更强的绿光发射,且绿光发射强度随热处理温度升高和时间的延长而增强.微晶玻璃在X射线激发下的最大积分发光强度约为商用闪烁晶体Bi4Ge3O12的40.3%.本研究表明,掺Tb3+含LaF3纳米晶锗酸盐微晶玻璃在X射线探测中具有潜在的应用前景.“,”Tb3+ doped transparent germanate glass ceramics embedded with LaF3 nanocrystals were successfully prepared via melt-quenching and subsequent thermal treatment. The luminescent properties of the as-prepared glass and the glass ceramics were investigated in detail. The X-ray diffraction results prove that the crystalline phase pre-cipitated in the glass matrix was pure LaF3 crystal and the crystal size was between 16 nm and 21 nm. Under the exci-tation of 377 nm ultraviolet light and X-ray, Tb3+ glass ceramics embedded with LaF3 nanocrystals show much intense green emission than Tb3+ doped germanate glass, and the green emission intensity increases with the increment of thermal treatment temperature and time. The maximum integrated X-ray excited luminescence intensity of the glass ceramics is about 40. 3% of that of Bi4Ge3O12 crystal which is the commercial scintillating crystal. Our research shows that Tb3+ doped germanate glass ceramics embedded with LaF3 nanocrystals have potential application prospects in X-ray detection.
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