BaFBr:Eu^(2+)中Al^(3+)的最佳掺杂浓度研究  

Investigation of Optimum of Al^(3+)-doped in BaFBr:Eu^(2+) by Electron Paramagnetic Resonance

作　　者：刘永胜[1] 余华[2] 

机构地区：[1]天津理工大学理学院,天津300191 [2]南开大学物理科学学院光子学中心,天津300071

出　　处：《光电子．激光》2005年第4期444-446,453,共4页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目;天津市自然科学基金重点资助项目(013180611)

摘　　要：把Al3+掺入BaFBr:Eu2+中,取代了其中部分Ba2+,这些金属离子将影响到色心F(Br- ),使其激发能变小。通过电子顺磁共振(EPR)谱研究了掺杂Al3+ 的量值对光激励发光强度的影响,确定光激励发光强度最大时的最佳掺杂比例为0.015%。对这一结果从色心的形成机理上进行了讨论,指出掺杂量不是越多越好,过多的掺杂Al3+能导致俘获电子的空位发生聚集,俘获电子的能力变弱,使光激励发光强度降低。Al3+ is doped into BaFBr: Eu2+ and substitutes part of Ba2+. Effect of the doping Al3+ on exciting energy of the color center F(Br-) was researched experimentally. The correlation between the quantity of doping Al3+ and the intensity of the photostimulated luminescence was investigated by using the electron paramagnetic resonance (EPR) spectra. While the highest intensity of the photostimulated luminescence is obtained, the optimal proportion of Al3+ is 0.015%. The mechanism of formed color centers was also discussed. It is found that over Al3+ doping will result in an aggregation of cavity of capturing electron, a weak ability in capturing electrons and a lower intensity of photostimulated luminescence.

关 键 词：BAFBR:EU^2+ AL^3+ 最佳掺杂浓度 电子顺磁共振 发光强度 Ba^2+ 光激励发光 金属离子 掺杂比例 形成机理 强度降低 激发能 掺杂量 色心 俘获 

分 类 号：O614.233[理学—无机化学] O657.3[理学—化学]