掺稀土离子的电子俘获材料  

Electron Trapping Materials Doped with Rare Earth Ions

作　　者：苏锵[1] 李成宇[1] 王静[1] 李娟[1] 张彦立 郭崇峰[3] 吕玉华[1] 

机构地区：[1]中国科学院长春应用化学研究所稀土化学与物理重点实验室,吉林长春130022 [2]国家计量研究院电离辐射部,北京100000 [3]中山大学光电子材料与技术国家重点实验室化学与化工学院,广东广州510275

出　　处：《发光学报》2005年第2期143-148,共6页Chinese Journal of Luminescence

基　　金：吉林省科技厅攻关资助项目(20020601)

摘　　要：可利用不等价离子取代法或高能射线辐照法制备电子俘获材料,如长余辉发光材料ZnO SiO2 B2O3 MnO、CaS∶Eu2+,Tm3+、CaGa2S4∶Eu2+,Ho3+和固体剂量材料Zn0. 96 (BO2 )2∶0. 04Tb,Sr0. 93Dy0. 07B4O7 等。利用俘获在缺陷中的电子空穴对的复合,并把能量传递给Eu2+或Mn2+等激活离子而产生长余辉发光或热释光。它们将在弱光照明与显示,信息存储和辐射治疗与探测、监控等方面获得应用。Defects can be produced in the matrix by aliovalent ionic substitution or by high-energy radiation. Electrons or holes can be trapped by these defects. Light will emit by radiative recombination of these electrons and holes released from traps with different depth. Some important luminescence materials doped with rare earth ion Eu 2+ or Mn 2+ such as long-lasting phosphorescence and solid dosimeters are based on this electron trapping process. Recently, we synthesized some electron trapping materials for long-lasting phosphors use. We prepared some glasses possessed of long-persistent phosphorescence and information storage properties. For example, ZnO-SiO 2-B 2O 3∶Mn 2+ glass shows red long afterglow. It is interesting to note that photo-stimulate long- persistent phosphorescence phenomenon is observed, information can be written and storages in the glass with 254 nm UV light and read out by visible or IR light. Depending on different annealing temperatures, this glass can transform into glass ceramics emitting yellow or green long-lasting phosphorescence light. We synthesized also the yellow phosphor CaGa 2S 4∶Eu 2+ ,Ho 3+ and red phosphor CaS∶Eu 2+ ,Tm 3+ with long-persistent phosphorescence properties. For improving the stability of the latter phosphor, we studied the oxide coating. We studied also the solid dosimetric property of some borates doped with Dy 3+ or Tb 3+ such as Sr 0.93 Dy 0.07 B 4O 7 or Zn 0.96 (BO 2) 2∶0.04Tb. After aliovalent ionic substitution and β-ray or γ-ray radiation, defects and traps are formed. The respond of the thermoluminescence intensity with the dose is linear, it may be used as detector for radio-diagnosis.

关 键 词：稀土 电子俘获材料 缺陷 

分 类 号：O482.31[理学—固体物理]