摘要
首次应用微波法合成了系列蓝色长余辉发光材料Sr2MgSi2O7/Eu02.+01,RE03.0+2(RE3+=Dy3+,Ho3+,Ce3+,Er3+,Nd3+),对材料进行了XRD,SEM、激发和发射光谱、余辉衰减曲线的测定.结果表明:激发峰是由250~450 nm的宽激发带组成,其中,掺杂Dy3+,Er3+,Nd3+荧光粉的激发光谱均为主激发峰位于310,356 nm处的宽带谱,掺杂Ce3+的激发光谱为主发射峰位于280,330,360 nm处的宽带光谱,掺杂Ho3+的激发光谱为主发射峰位于315,360,400 nm的宽带光谱;发射光谱为主发射峰位于465 nm处的宽带发射谱,该发光归属于Eu2+的4f65d→4f7的允许电偶极宽带跃迁,并且随着Er3+,Dy3+,Nd3+,Ce3+,Ho3+的顺序发光强度逐渐降低.余辉衰减曲线显示初始发光亮度最高,余辉时间最长的是Sr2MgSi2O7/Eu02.0+1,Nd03.0+2.
The luminescence material of Sr2MgSi2O7/Eu2＋0.01,RE3＋0.02（RE3＋=Dy3＋,Ho^3＋,Ce^3＋,Er^3＋,Nd^3＋） was synthesized by microwave radiation method for the first time.The crystal composition and crystal shape of the samples were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）,respectively.The excitation and emission spectra of fluorescence were measured by fluorometry.The sample exhibited broad peaks in both the excitation and emission spectra.The main excitation peaks lied in 310,356 nm after doping Dy3＋,Er^3＋,Nd^3＋,280,330,360 nm after doping Ce^3＋,315,360,400 nm after doping Ho^3＋,respectively.The main emission peaks lied in 465 nm.The results indicated that the luminescence of these phosphors was due to 4f65d→4f7 transition of Eu2＋.The strength of the emission peaks was reduced with the sequence of Er^3＋,Dy3＋,Nd^3＋,Ce^3＋,Ho^3＋.The decay curve of fluorescence showed Sr2MgSi2O7∶Eu2＋,Nd^3＋ had the merits of the highest initial luminescent intensity and the longest duration time.
出处
《河北师范大学学报（自然科学版）》
CAS
北大核心
2009年第2期206-209,共4页
Journal of Hebei Normal University：Natural Science
基金
河北师范大学博士基金(103261)
河北省教育厅科学研究基金(ZH2006002)
关键词
硅酸盐
发光材料
长余辉
微波合成
silicate
luminescent materials
long lasting phosphors
microwave synthesis
