BaFBr:Eu2 中Al3 的最佳掺杂浓度研究

把Al^3 掺入BaFBr：Eu^2 中，取代了其中部分Ba^2 ，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Al^3 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Al^3 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。

Investigation of Optimum of Al3 -doped in BaFBr:Eu2 by Electron Paramagnetic Resonance

Al~(3+) is doped into BaFBr:Eu~(2+) and substitutes part of Ba~(2+).Effect of the doping Al~(3+) on exciting energy of the color center F(Br~-) was researched experimentlly.The correlation between the quantity of doping Al~(3+) 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 Al~(3+) is 0.015%.The mechanism of formed color centers was also discussed.It is found that over Al~(3+) doping will result in an aggregation of cavity of capturing electron,a weak ability in capturing electrons and a lower intensity of photostimulated luminescence.