Preparation and luminescent properties of CaAl2O4:Eu3+,R+（R=Li,Na,K） phosphors
来源期刊：Journal of Rare Earths2010年第1期
论文作者：李广环 龙涛 宋艳华 高桂梅 徐吉静 安佰超 甘树才 洪广言
文章页码：22 - 25
摘 要：CaAl2O4:Eu3+,R+（R=Li+,Na+,K+） red phosphors were synthesized by solid state reaction method.X-ray diffraction（XRD） and photoluminescence（PL） were employed to characterize their structural and luminescent properties.It was found that the optimal sintering temperature and sintering time were 1200 °C and 4 h,respectively.The optimal concentration of doped Eu3+ was 3 mol.%.Furthermore,under ultraviolet excitation with a wavelength of 254 nm,these samples showed red luminescence which were probably attributed to the transitions from 5D0 excited state to 7FJ（J=0-4） ground states of Eu3+ ions.The feature and the high intensity of hypersensitive transition from 5D0→7F2 indicated that Eu3+ preferred to occupy a low symmetry site.The incorporation of alkali metal ions greatly enhanced the luminescence intensity probably due to the influence of charge compensation of alkali metal ions.
李广环1，龙涛1，宋艳华2，高桂梅1，徐吉静1，安佰超1，甘树才1，洪广言2
1. College of Chemistry,Jilin University2. Changchun Institute of Applied Chemistry,Chinese Academy of Sciences
摘 要：CaAl2O4:Eu3+,R+（R=Li+,Na+,K+） red phosphors were synthesized by solid state reaction method.X-ray diffraction（XRD） and photoluminescence（PL） were employed to characterize their structural and luminescent properties.It was found that the optimal sintering temperature and sintering time were 1200 °C and 4 h,respectively.The optimal concentration of doped Eu3+ was 3 mol.%.Furthermore,under ultraviolet excitation with a wavelength of 254 nm,these samples showed red luminescence which were probably attributed to the transitions from 5D0 excited state to 7FJ（J=0-4） ground states of Eu3+ ions.The feature and the high intensity of hypersensitive transition from 5D0→7F2 indicated that Eu3+ preferred to occupy a low symmetry site.The incorporation of alkali metal ions greatly enhanced the luminescence intensity probably due to the influence of charge compensation of alkali metal ions.
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