Gd^(3+)对玻璃闪烁体发光性能的影响

Effects of Gd^(3+) on luminescent properties of glass scintillator

采用高温熔融法制备了Si O2-Li2O-Al2O3-Mg O为基质系统的Gd3+、Ce3+掺杂的玻璃样品,研究了玻璃闪烁体中Gd3+引入对其发光性能的影响,结果表明:玻璃闪烁中Gd3+的引入存在Gd3+→Ce3+能量转移机制,有利于提高玻璃闪烁体的发光强度,Gd3+的引入同时提高了玻璃闪烁体的光碱度,使发射波长产生了相应的红移,Stokes位移变大;Gd3+在玻璃闪烁中较佳掺杂范围在15%左右,过高会产生浓度淬灭效应,不利于玻璃闪烁体的发光。

The SiO2-Li2O-Al2O3-MgO system based samples doping with rare earth Ce^3＋ ions and Gd^3＋ ions are synthesized by high temperature melting method. Effects of Gd^3＋ on luminescent properties of glass scintillator have been studied. Results of meausred radioluminescence spectra show that the introduction of Gd^3＋ in glass improves the scintillator luminescent intensitiy because of Gd^3＋→Ce^3＋ energy transfer mechanism, and at the same time, the introduction of Gd^3＋ increase Optical basicity of glass scintillator, so that the corresponding emission wavelength red-shift and larger Stokes shift produced; Gd^3＋ content in the glass have a better range about 15%, too high will not help to luminescence of glass scintillator because of corresponding concentration quenching effect.