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用溶胶-凝胶法在弱还原气氛下合成了纳米级 Ca3SiO5:Eu2+绿色荧光粉。研究了 Eu2+浓度的含量对发光强度的影响,表明在 Ca3SiO3:Eu2+中添加 Eu2+的最佳含量为 0.005 mol。X 射线衍射分析表明:在 1000～1200 ℃合成的 Ca3SiO5:0.005 Eu2+样品为单相 Ca3SiO5晶体。根据 Scherrer 公式计算样品的平均晶粒尺寸为 30 nm 左右,与扫描电镜分析结果基本相符。样品的发射光谱与激发光谱都为宽带谱,其中发射光谱是峰值为 505 nm 的不对称宽带谱,而激发光谱是主峰为 374 nm 的连续光谱。
Nanoscaled Ca3SiO5: Eu2 + green phosphor was synthesized by sol-gel method in a weak reducing atmosphere. The effect of the content of Eu2 + on the luminescence intensity was studied. The optimum content of Eu2 + in Ca3SiO3: Eu2 + was 0.005 mol. X-ray diffraction analysis shows that the Ca3SiO5: 0.005 Eu2 + sample synthesized at 1000-1200 ℃ is single-phase Ca3SiO5 crystal. According to Scherrer formula, the average grain size of sample is about 30 nm, which is basically consistent with the result of SEM. The emission spectrum and excitation spectrum of the sample are all broadband spectra. The emission spectrum is asymmetric broadband spectrum with a peak value of 505 nm, while the excitation spectrum is a continuous spectrum with the main peak at 374 nm.