采用高温固相法制备了一系列γ-Ca2SiO4∶xCe3＋,yAl3+黄色荧光粉, 通过X射线衍射仪、扫描电镜、激光粒度仪、荧光光谱仪对荧光粉的结构、形貌和光学性能进行了表征。结果表明, 1 200~1 300 ℃温度下生成β-Ca2SiO4, 在1 350~1 500 ℃下生成γ-Ca2SiO4, Al3+和Ce3＋ 的掺入未改变Ca2SiO4的结构。在1 450 ℃下合成的γ-Ca2SiO4∶0.5%Ce3＋ ,4%Al3+样品的相对发光强度最强。在450 nm激发下, 在565 nm处存在一个宽带发射峰, 主要源于Ce3＋ 的5d→2F7/2和5d→2F5/2跃迁。荧光粉受热影响较大, 在450 nm激发下, 样品在475 K时的发光强度降为室温的63%。监控波长为565 nm时, Ce3＋ 的衰减曲线符合单指数衰减规律, 荧光寿命为104.2 ns, 与其跃迁类型和离子价态基本相符。

A series of γ-Ca2SiO4∶xCe3＋,yAl3+ yellow phosphors were prepared by high temperature solid-state reactions. The structure, morphology and optical properties of the phosphors were characterized by X-ray diffractometer, scanning electron microscope, laser particle size analyzer, and fluorescence spectrometer. The results show that β-Ca2SiO4 and γ-Ca2SiO4 samples form at 1 200~1 300 ℃ and 1 350~1 500 ℃, respectively. The structures of Ca2SiO4 don’t change with Al3+ and Ce3＋ doping. The luminescence intensity of γ-Ca2SiO4∶0.5%Ce3＋ ,4%Al3+calcined at 1 450 ℃ reaches the maximum. Under the excitation of 450 nm, a broad band emission centered at 565 nm is observed, which mainly corresponds to 5d→2F7/2 and 5d→2F5/2 transitions of Ce3＋ . The luminescence intensity of phosphor is influenced by temperature, and it decreases by 37% as the temperature increases from room temperature to 475 K. The decay curves of Ce3＋ can be fitted as the single exponential function. The fluorescence lifetime of the phosphor is 104.2 ns, which is basically consistent with the transition types as well as ionic valence of Ce3＋ .