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以无水乙醇作反应溶液,采用室温共沉淀,合成了CaHPO_4:Tb~(3+)绿色荧光粉。用X射线衍射(XRD)、扫描电镜(SEM)、荧光(PL)光谱、热重(TG)和差示扫描量热(DSC)等分别对所得样品的相结构、形貌、发光性能以及热稳定性进行研究。研究结果表明,在室温条件下,得到了纯三斜相CaHPO_4:Tb~(3+);当烧结温度为400℃时,开始出现相结构转变;温度升高到500℃以上时,晶相完全转变为纯四方晶系Ca_2P_2O_7,但样品的形貌变化很小,都为分散性比较好、尺寸分布比较均匀的纳米颗粒。同时,利用激发光谱和发射光谱研究了Tb~(3+)在CaHPO4和Ca_2P_2O_7基质中的发光性能,在波长为370nm紫外光的激发下,都观察到Tb~(3+)的特征跃迁(5D4→7FJ,J=3~6),其中以5D4→7F5跃迁发射(544nm)为主,而且CaHPO_4:Tb~(3+)的发光强度要明显强于Ca_2P_2O_7:Tb~(3+)。
With anhydrous ethanol as the reaction solution, coprecipitation at room temperature, the synthesis of CaHPO_4: Tb ~ (3 +) green phosphor. The phase structure, morphology, luminescent properties and thermal properties of the obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), fluorescence spectroscopy (PL), thermogravimetry (TG) and differential scanning calorimetry (DSC) Stability studies. The results show that the pure trish phase CaHPO_4: Tb ~ (3+) is obtained at room temperature. When the sintering temperature is 400 ℃, phase transformation begins to occur. When the temperature is above 500 ℃, the crystal phase is completely Into pure tetragonal system Ca_2P_2O_7, but the morphology of the sample changes very little, are better dispersion, the size distribution of relatively uniform nanoparticles. At the same time, the luminescent properties of Tb 3+ in CaHPO 4 and Ca 2 P 2 O 7 matrices were studied by using excitation and emission spectra. The characteristic transition of Tb 3+ was observed under excitation of UV light at wavelength of 370 nm (5D4 → 7FJ, J = 3 ~ 6). The 5D4 → 7F5 transition emission (544nm) is dominant, and the luminescence intensity of CaHPO_4: Tb ~ (3+) is stronger than that of Ca_2P_2O_7: Tb ~ (3+).