KMgF3∶Ce^3＋,Eu^2＋的溶剂热合成与光谱性质  

Solvothermal Synthesis and Fluorescence of KMgF_3∶Ce^(3+),Eu^(2+)

作　　者：朱国贤[1,2,3] 连洪州[3] 李永大[1] 王兴权[1] 石春山[3] 

机构地区：[1]长春理工大学理学院,长春130022 [2]湛江师范学院化学科学与技术学院,湛江524048 [3]中国科学院稀土化学与物理重点实验室,长春130022

出　　处：《无机化学学报》2008年第11期1822-1826,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.50702057)资助项目

摘　　要：采用溶剂热法合成了Eu2+,Ce3+单掺和双掺KMgF3。分析了样品的结构与形貌。结果表明,所合成的样品均为单相,颗粒粒度分布集中。测定了它们的激发和发射光谱,结果显示:在单掺Eu2+的KMgF3中,没有观察到位于420nm附近由微量氧色心引起的宽带发射,只发现峰值位于360nm附近的锐峰线发射,说明溶剂热合成的KMgF3∶Eu中氧含量极低;在KMgF3双掺体系中由于Eu2+和Ce3+竞争吸收激发能,Eu2+把能量传递给Ce3+,存在Eu2+→Ce3+能量传递过程,观察到Ce3+的较强的发射带和Eu2+的较弱的线发射,并讨论了能量传递机理。Phosphors of KMgF3 single-doped and co-doped with Ce^3＋ and/or Eu^2＋ were synthesized respectively through solvothermal method at 180 ℃ and characterized by means of X-ray powder diffraction （XRD） and environment scanning electron microscopy （ESEM）. The excitation and emission spectra of the rare earth ions doped KMgF3 through solvothermal process was also studied. In the KMgF3 ：Eu^2＋ sample, there was only one sharp line emission located at 360 nm arising fromf-f（^6p7t2→^8S7/2） transition of Eu^2＋ in the host lattice and the broad bands appearing at 420 nm arising from Eu^2＋←O could not be observed. The results showed that the oxygen content was low. In the system of KMgF3 co-doped with Ce^3＋ and Eu^2＋, the strong emission band of the Ce^3＋ could be observed due to the competitive absorption of the exciting energy between the Eu^2＋ and Ce^3＋, while the emission peak of the Eu^2＋ could only be observed due to energy transfer from Ce^3＋ to Eu^2＋ appearing in the KMgF3：Eu^2＋, Ce^3＋ polycrystalline powder prepared by solid state reaction at a high temperature. In addition, the mechanism of energy transfer was discussed.

关 键 词：溶剂热 稀土离子 KMGF3 光谱 能量传递 

分 类 号：O614.113[理学—无机化学] O614.22[理学—化学]