【摘要】 使用高温固相法合成了长余辉发光材料Ba3.88-x(Si3O8)2∶0.12Eu2+,xNd3+。实验分别获得了样品的晶体结构、激发与发射谱、余辉衰减、热释光等信息。样品呈现Eu2+的宽带发射,发射峰位在495nm,Nd3+的共掺没有引入新的发光中心;Nd3+共掺对材料的荧光强度和余辉强度都有明显的提高,并延长了余辉时间,Nd3+共掺的最优比例为x=0.04,此条件下材料的肉眼可视的余辉时间从Eu2+单掺的约20min延长至1h;通过对样品的不同等待时间的热释光分析,发现热释光峰位随时间向高温方向移动,过程中半高宽基本不变,对称因子μg维持在0.52左右,对应的陷阱深度为0.89eV,陷阱释放载流子的过程可视为二阶动力学过程。更多还原

【Abstract】 Long afterglow phosphors Ba3.88-x(Si3O8)2∶0.12Eu2+,xNd3+ were synthesized by a solid state reaction.The crystal structure,excitation spectra,emission spectra,long afterglow decaying curves and thermoluminescence(TL)curves of samples were obtained in our work.The samples show a broad emission band of Eu2+ centered at 495 nm,and no new luminescent center appeared with Nd3+ co-doping.The fluorescence and afterglow intensities were both magnified obviously with Nd3+ co-doping,and the afterglow time prolonged.The optimal proportion of Nd2+ single doping was x=0.12,exhibiting a long-lasting phosphorescence lasting for 1h visible to the naked eyes,more than 20 min with Eu2+ single doped.The analysis of TL with different waiting time shown that the TL peak shifts to the higher temperature with time prolongs,the half widths remain unchanged,the symmetry constantμgwas about 0.52,the traps depth was 0.89 eV,and the process of releasing carriers was very close to the second order kinetics.更多还原