蓝白色荧光材料Sr2SiO4:Ce3+的溶胶-凝胶法制备及发光性能研究

采用溶胶-凝胶法,在空气环境中合成了蓝白色Sr2SiO4:Ce3+荧光材料,合成温度为900℃,这远低于田相法制备同类硅酸盐材料所需温度.X射线衍射图表明,所得样品主要为纯相Sr2SiO4晶体.由扫描电子显微镜图像可知,样品一次颗粒尺度在2 μm以下.处于254 nm紫外光激发下,样品发射光谱为峰值位于472 nm的不对称单峰宽带谱,是典型的蓝白光发射.监测472 nm发射峰,得到其激发谱为近紫外连续光谱峰值位于272 nm,321 nm.通过改变Ce3+浓度,进一步研究了参杂浓度对发光强度的影响.

Fabrication and Optical Properties of Sr2SiO4:Ce3+ Phosphors via Sol-gel Process

In the air,the Sr2SiO4:Ce3+ phosphors were prepared in a sol-gel progress.The X-ray diffraction image show that the samples synthesized at 900 ℃ were pure Sr2SiO4:Ce3+,which lower than solid state reaction method.The scan electron microscope image display that the particle size about 2 μm without triturating;Excited by a radiation of 272 nm,the phosphors emitting a strong blue-white fluorescence,and its emission spectrum shows a broad band with a unsymmetrical peak at 470 nm.The excitation spectrum of the Sr2SiO4:Ce3+ phosphors display a broad band with two peaks around 272 nm and 321 nm near the band of ultraviolet.