caal2o4:eu3+，r+ (r=li， na， k)荧光粉的发光性能及其制备[外文翻译].zip

材料科学与工程 材料物理与化学，外文文献翻译及原文

Preparation and luminescent properties of CaAl2O4:Eu3+,R+(R=Li, Na, K)phosphors

CaAl2O4:Eu3+,R+ (R=Li, Na, K)荧光粉的发光性能及其制备

Abstract: CaAl2O4:Eu3+, R+(R=Li+, Na+, K+) red phosphors were synthesized by solid state reaction method. X-ray diffraction (XRD) andphotoluminescence (PL) were employed to characterize their structural and luminescent properties. It was found that the optimal sinteringtemperature and sintering time were 1200 °C and 4 h, respectively. The optimal concentration of doped Eu3+was 3 mol.%. Furthermore, un-der ultraviolet excitation with a wavelength of 254 nm, these samples showed red luminescence which were probably attributed to the transi-tions from5D0excited state to7FJ(J=0–4) ground states of Eu3+ions. The feature and the high intensity of hypersensitive transition from5D0→7F2indicated that Eu3+preferred to occupy a low symmetry site. The incorporation of alkali metal ions greatly enhanced the lumines-cence intensity probably due to the influence of charge compensation of alkali metal ions

摘要：通过固相反应法合成了CaAl2O4:Eu3+, R+ (R=Li+, Na+, K+) 红色荧光粉。利用X射线衍射（XRD）和光致发光（PL）对其进行了表征其结构及发光性能的检测。被发现其最佳的烧结温度和烧结时间分别为1200°C和4 h，掺杂Eu3+的最佳浓度为3 mol.%。此外，用波长为254 nm的紫外光激发下，这些样品显示红色发光可能是归因于Eu3+从 5D0激发态跃迁到7FJ (J=0–4)的基态。从其特征和 5D0→7F2 超高灵敏的跃迁表明，Eu3+优先占据低能级态。碱金属离子的掺入大大的增强了荧光粉的发光强度可能是由于碱金属离子对的电荷补偿。