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采用凝胶-燃烧法合成了Sr2SiO4:Ce3+蓝紫色荧光粉,借助XRD、FE-SEM、荧光光谱仪对样品的晶体结构、形貌、光谱特性等进行了分析。结果表明:所得Sr2SiO4:Ce3+样品为正交晶系α′-Sr2SiO4纯相,平均粒径为1.5μm左右;样品的激发光谱为峰值位于251nm、276nm和353nm的近紫外宽带谱,归属于Ce3+离子的5d04f1→5d14f0跃迁;样品的发射光谱是峰值位于408nm的不对称单峰宽带谱,由400nm和429nm两个高斯峰组成,分别来源于Ce3+离子5d14f0向基态2F7/2和2F5/2能级的跃迁。此外,对Ce3+掺杂浓度、热处理温度和时间对Sr2SiO4:Ce3+发光性能的影响进行了讨论。
The Sr2SiO4: Ce3 + blue-violet phosphor was synthesized by gel-combustion method. The crystal structure, morphology and spectral properties of the samples were analyzed by XRD, FE-SEM and fluorescence spectroscopy. The results show that the obtained Sr2SiO4: Ce3 + sample is orthorhombic α’-Sr2SiO4 pure phase and the average particle size is about 1.5μm. The excitation spectrum of the sample is near-UV broad band with peaks at 251nm, 276nm and 353nm, belonging to Ce3 + 5d04f1 → 5d14f0 transition. The emission spectrum of the sample is an asymmetric unimodal broadband spectrum with a peak at 408 nm. It consists of two Gaussian peaks at 400 nm and 429 nm, respectively derived from the Ce3 + ion 5d14f0 to the ground states 2F7 / 2 and 2F5 / 2 Jump In addition, the effects of Ce3 + doping concentration, heat treatment temperature and time on the luminescent properties of Sr2SiO4: Ce3 + are discussed.