摘要
以具有一维结构的Sr_2CeO_4化合物为研究对象、Sm^(3+)作为发光中心,探索了其作为LED用荧光材料的可能性.用高温固相法于1200℃、6h合成了Sr_2CeO_4:Sm^(3+)系列单相粉末样品,并研究了其发光性质.结果表明,在365nm激发下,从荧光光谱中可以看出存在从基质向稀土离子的能量转移.通过调节荧光材料Sr_2CeO_4:Sm^(3+)中稀土离子Sm^(3+)的掺杂浓度,可以调谐发光体的发光颜色,当Sm^(3+)离子浓度较小(<3%)时,体系发出很强的白光;当Sm^(3+)离子浓度较大(3%~15%)时,体系发出红光.测量了荧光材料的色坐标,发现Sr_2CeO_4:1%Sm^(3+)的色坐标是(0.334,0.320),接近于纯白色(0.33,0.33),可以作为一种新型的UV-LED用单一白色荧光材料.
The trivalent samarium doped Sr2CeO4 color-tunable phosphors were successfully synthesized by solid state reaction at 1200℃ for 6h and their luminescent characteristics were studied. The results indicate that the host can transfer its exciting energy to rare earth ion Sm^3+ when excited with 365nm light. The emission color can be changed by tuning activator's concentration in Sr2CeO4:Sm^3+ phosphors. The doped compound emits strong white light when the concentration of the doped Sm^3+ is lower than 3%. When the Sm^3+ concentration is increased from 3% to 15%, it emits red light. The chromaticity coordinate of Sr2CeO4: 1%Sm^3+ phosphor is measured to be (x, y) (0.334, 0.320), which is closed to the pure white (0.33, 0.33). It shows that Sr2CeO4: 1%Sm^3+ phosphor is a promising single white phosphor for ultraviolet light-emitting diode.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第3期471-474,共4页
Journal of Inorganic Materials
基金
新世纪优秀人才支持计划(04-0978)
教育部科学研究重点项目(105170)
高等学校博士学科点专项科研基金(20040730019)