Mg²⁺,Ca²⁺,Ba²⁺离子部分取代对SrAl₂O₄:Eu²⁺,Dy³⁺晶体结构和发光性能的影响

来源期刊：有色金属科学与工程2011年第1期

论文作者：文小强 王玉香 赖华生 周健

文章页码：39 - 42

关键词：长余辉;碱土金属;缺陷能级;余辉衰减

Key words：long afterglow; alkaline earth; defect levels; afterglow increases

摘    要：

采用高温固相反应法制备了Sr_0.9M_0.1Al₂0₄:Eu²⁺,Dy³⁺(M=Mg, Ca, Ba)长余辉发光材料，并对其晶体结构、光谱性质、余辉特性进行了分析．x射线衍射测试结果表明，Mg²⁺,Ca²⁺,Ba²⁺离子部分取代SrAl₂O₄基质中的Sr后，基质晶体结构并没有发生改变．光谱测试结果表明，Mg²⁺,Ca²⁺,Ba²⁺取代后发光材料的激发光谱都是一个从250～450 nm范围内的宽激发带，在266nm，320nm，360nm，416 nm处各有一个激发峰．发射光谱中Mg²⁺和Ba²⁺的取代使波长出现蓝移，而Ca²⁺的取代使波长出现红移．余辉测试结果表明，Ca²⁺取代后的余辉时间长于Mg²⁺和Ba²⁺的取代．

Abstract: The rare-earth doped afterglow phosphors Sr_0.9M_0.1Al₂0₄:Eu²⁺,Dy³⁺(M=Mg, Ca, Ba) were synthesized by a high temperature solid-state reaction method. Crystal structure, spectrum properties, afterglow performance of the samples was analyzed. X-ray diffractometry (XRD) patterns indicated that the crystal structure was not changed with some Mg²⁺,Ca²⁺,Ba²⁺ taking the place of Sr in SrAl₂0₄. Spectrum measurements showed that the excitation spectrum is a wide excitation band at 250~450 nm after Mg²⁺,Ca²⁺,Ba²⁺ taking the places, and excitation peaks were observed in the excitation spectrum at 266,320,360,416 nm. The wavelength has a little blue shift with Mg²⁺ and Ba²⁺ instead and has a little red shift with Ca²⁺ instead. Afterglow testing observed that the afterglow time is longer with Ca²⁺ instead than Mg²⁺, Ba²⁺ instead.