ZnAl_2O_4:Eu^(3+)发光粉的制备与光谱研究

Preparation and Photoluminescence of ZnAl_2O_4: Eu^(3+) Phosphor

采用固相反应法(SSR)制备Eu3+掺杂的ZnAl2O4荧光粉,利用X射线衍射(XRD)、光致荧光光谱(PL)对样品进行表征.结果表明:Eu3+的掺杂浓度在不超过0.5 at.%时,样品呈现ZnAl2O4纯相尖晶石结构;样品Zn1-xAl2O4:xEu的激发光谱由200～350 nm的宽激发带和4个锐线谱(360、380、393和463 nm)两部分组成;ZnAl2O4:Eu3+荧光粉的发射光谱由Eu3+的5D0-7FJ(J=0～4)跃迁构成.

ZnAl2O4 phosphors doped with Eu3＋ ions were prepared by the solid state reaction method. X-ray diffraction（XRD）, Photoluminescence（PL） measurements were used to characterize the samples. Analysis results showed that the sample structure keeps pure spinel phase up to the doping concentration of 0.005 of Eu^3＋. The excitation spectra of Zn1-xAl2O4： xEu phosphors consist of two wide excitation bands located within 200- 350 nm and four sharp peaks belong to the intra shell f-f transitons of Eu3＋ ions. The wide excitation bands within 200-350 nm relate to the charge transfer band and the host absorption. The emission spectra of the samples consist of 5D0-TFj（J= 0-4） transitions of Eu^3＋ ions.