通过发射光谱、XRD、相对亮度、余辉衰减曲线和热释光谱的测量,研究了在Y2O2S:Eu体系中掺杂Mg2+、Ca2+、Sr2+、Ba2+、Ti4+对荧光体的发光与长余辉特性的影响.结果表明,这些离子的掺杂不影响发射光谱和晶体结构,但显著地影响相对亮度和长余辉特性.它的长余辉衰减过程由一快过程和一慢过程组成,很好地符合指数衰减方程。Mg、Ti共掺杂荧光体的相对亮度和长余辉性能优于单掺杂,与Mg、Ti的含量比有关.根据实验结果,探讨了Y2O2S:Eu体系荧光体的长余辉发光机理.
Y2O2S:Eu phosphors doped with Mg2+, Ca2+, Sr2+, Ba2+, Ti4+ were studied by PL spectra, XRD, decay curve, relative brightness and TL spectra. The results show that those dopants
do not change crystal structure of the host, but influence afterglow properties and relative brightness, and the decay curve comprised of a fast and a slow part is well exponential. Codopants of Mg and Ti
suggest the longer afterglow duration than single ion doping, being dependent on their contents. The long afterglow mechanism of Y2O2S:Eu host materials was discussed on the basis of experimental results.
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