| Sr2CeO4∶Eu3+柠檬酸-凝胶法的合成及发光性质研究 |
| Synthesis of Sr2CeO4∶Eu3+ by Citrate-gel Method and its Luminescence Properties |
|
| 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。 |
| 关键词: 柠檬酸-凝胶法 Sr2CeO4 发光性质 |
| 基金项目: |
| Abstract: A novel phosphor Sr2CeO4 was synthesized by the citrate-gel method. The results of XRD show that the tem-perature 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. |
| Keywords: citrate-gel method Sr2CeO4 energy transfer luminescence properties |
| |
| 摘要点击次数: 1803 |
| 全文下载次数: 2167 |
| 揣晓红,张洪杰,李福燊,周国治.Sr2CeO4∶Eu3+柠檬酸-凝胶法的合成及发光性质研究[J].无机化学学报,2003,19(5):462-466. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
