Sr_2CeO_4∶Eu^(3+)柠檬酸-凝胶法的合成及发光性质研究  

Synthesis of Sr_2CeO_4∶Eu^(3+) by Citrate gel Method and its Luminescence Properties

作　　者：揣晓红[1] 张洪杰[2] 李福燊[3] 周国治[3] 

机构地区：[1]集成光电子学国家重点联合实验室吉林大学实验区,长春130021 [2]中国科学院长春应用化学研究所 [3]北京科技大学冶金学院理化系,北京100082

出　　处：《无机化学学报》2003年第5期462-466,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目(No.29731010);国家攀登计划项目;国家杰出青年基金资助项目(No.29225102)。

摘　　要：柠檬酸-凝胶方法促使多离子在分子水平上混合,与固相烧结方法相比,能够降低烧结温度和烧结时间。利用这种方法在1000℃下很短的时间得到单相化合物Sr2CeO4。Sr2CeO4是一种发出很强蓝光的基质发光材料。为寻找新的发光体,我们将稀土离子Eu3+掺杂在其中,从荧光光谱上可以看出存在从基质向稀土离子的能量转移。Sr2CeO4∶Eu3+的发光颜色可调谐,当Eu3+离子浓度较小(<0.5mol%)时,体系发出很强的白光;当Eu3+离子浓度较大(>10mol%)时,体系发出很强的红光,并且猝灭浓度高。A novel phosphor Sr2CeO4 was synthesized by the citrate-gel method. The results of XRD show that the temperature at which the crystallization starting is lowered and the soak time for complete crystallization is decreased. The values of pH of the precursor and the ratio( R) between the citrate and cation ions have an effect on the crystallization process. The host can transfer its exciting energy to rare earth ion Eu3+. The doped compound emits strong white light when the concentration of the doped Eu3+ is low. When that of Eu3+ is increased, it emits strong red light. The fluorescence from the higher excited states can be observed because the multiphonon relaxation probability between Eu3+ ions is low.

关 键 词：柠檬酸 凝胶法 合成 发光性质 Sr2Ce04 锶铈复合氧化物 铕 掺杂 发光材料 

分 类 号：O614.332[理学—无机化学] O482.31[理学—化学]