Al离子掺杂增强SrTiO_3:Pr^(3+)荧光体发光性能的研究  

Enhanced Luminescence for SrTiO_3:Pr^(3+) Phosphors with the Addition of Al^(3+) Ions

作　　者：张朋越[1] 钟伟[1] 蒋继峰[1] 洪樟连[1] 

机构地区：[1]浙江大学材料系,浙江杭州310027

出　　处：《稀有金属材料与工程》2008年第A02期304-307,共4页Rare Metal Materials and Engineering

基　　金：教育部留学回国人员科研启动基金(No.2003-14);浙江省科技厅项目(No.2003C11027)资助

摘　　要：采用Sol-gel方法合成了Al和Pr离子共掺的红色纳米晶SrTiO3:0.002Pr,xAl(x=0～0.35)荧光体。XRD分析表明,经1200℃高温烧成后所得的荧光体为单一组成的SrTiO3立方相,空间群为Pm-3m,晶胞参数计算得a为3.9043nm。光谱测试表明,该荧光体的主发射峰位于617nm,对应于Pr3+离子的1D2→3H4跃迁发射。随着Al3+掺杂浓度的增加,发光强度先增后减,当x=0.26时发光强度达到最大值,此时荧光体的发光强度约是未掺Al样品发光强度的2倍。晶体结构和光谱性能分析暗示,Al3+离子掺入可能提高了SrTiO3:Pr基质晶体的完整度,从而增加其发光强度。In this work, SrTiO3：Pr3＋ phosphors with Al3＋ addition were prepared by sol-gel method. The luminescence property was investigated by Photoluminescence spectrum. The result of Photoluminescence （PL） spectra at room temperatures shows that the intensity of red emission peak contributed to 1D2→3H4 transition of Pr3＋ ion increases with an increase in Al3＋ molar ratio. The maximal emission intensity of the phosphors, SrTiO3：Pr3＋ synthesized with 26mol Al3＋, is about 2 times higher than Al-free sample. The mechanism of enhancement on the red emission efficiency from SrTiO3：Pr3＋ （1D2→3H4 of Pr3＋） by Al addition was discussed. Based on the result of PL spectra and XRD, it is speculated that both the improvement of crystallinity of SrTiO3：Pr3＋ with Al3＋ addition and the increase of Al-associated Pr3＋ luminescence centers, resulting in a decrease in defects and probably an increase in the energy transfer to radiative centers, and then luminescence intensity is enhanced.

关 键 词：SrTiO3:Pr Sol—gel 发光 荧光粉 

分 类 号：TN104.3[电子电信—物理电子学]