红色荧光粉YAlO3：Eu^3＋Cu^＋的制备和发光特性

研究了化学沉淀法制备YAP：Eu3＋Cu＋荧光粉,得到适宜工艺参数.用XRD和PL谱分别表征前驱体的晶体结构和荧光粉的荧光特性.前驱体的焙烧温度为1 200℃,焙烧时间为2 h;Eu3＋的适宜掺杂浓度为3%,而且在398 nm紫外光激发下荧光粉呈现红色光谱,这是由于Eu3＋的4fn电子组态内5D0→7FJ（J=0～4）的跃迁发射,由5D0→7F2的发射特性和发射强度表明Eu3＋主要处于非反演对称中心.Cu＋增强了YAP：Eu3＋的发光强度是因为Cu＋→Eu3＋之间的能量传递,Cu＋对Eu3＋有敏化作用.

Synthesis and Luminescent Properties of YAlO3：Eu^3＋Cu^＋ Red Phosphors

YAP：Eu3＋Cu＋ red phosphors were synthesized by coprecipitant.X-ray diffraction and photoluminescence were employed to characterize their structural and luminescence properties.It was found the appropriate sintering temperature and sintering time were 1 200 ℃ and 2 h respectively.The appropriate concentration of doped Eu3＋ was 3%.Under ultraviolet excitation with the wavelength of 398 nm,these samples showed red luminescence which were probably attributed to transition from 5D0 excited state to 7FJ（J=0~4） ground states.The transition from 5D0→7F2 indicated that Eu3＋ preferred to occupy a low symmetry site.The incorporation of Cu＋ ions greatly enhanced the luminescence intensity probably due to the Cu＋→Eu3＋ energy transfer.