摘要
通过水热共沉淀方法制备了亚微米长余辉发光材料Sr2MgSi2O7:Eu2+,Dy3+,使用X射线衍射、扫描电镜、光致发光以及热释发光光谱对所合成的材料进行了研究。结果表明:在1 000℃下烧结4 h的样品为四方晶系单相,结晶度随着烧结温度的升高而进一步改善,所制备的材料分散性良好,尺寸在200～300 nm之间。在399 nm激发下,样品呈现出主峰位于467 nm的蓝光发射,来自于Eu2+的5d-4f跃迁。在1 100℃烧结获得的样品的长余辉发光优于1 000℃烧结的样品。样品的热释光谱为一个不对称分布的宽带,主峰位于330～340 K之间,热释光谱对应的峰值范围有利于产生长余辉发光。
Long-lasting phosphors Sr2MgSi2O7:Eu2+,Dy3+ were synthesized via hydrothermalprecipitation route.X-ray diffraction(XRD),scanning electron microscopy(SEM),photoluminescence(PL),as well as thermoluimnescence(TL) were utilized to characterize the long-lasting phosphors.XRD analysis indicates the obtained Sr2MgSi2O7:Eu2+,Dy3+ sample annealed at 1000 ℃ for 4 h is tetragonal crystal phase.The crystallinity increases with temperature.The obtained phosphors consist of well dispersed submicron particles with a narrow size distribution of 200～300 nm,and these phosphor particles show blue emission corresponding to 5d-4f(467 nm) of Eu2+ under the excitation of visible light(399 nm).The afterglow time of sample synthesized at 1100 ℃ is longer than those synthesized at 1000 ℃ and 1050 ℃.The thermoluminescence spectra of samples show broad bands centering at 330～340 K,which is suitable for the generation of long-lasting phosphorescence.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2013年第8期988-993,共6页
Chinese Journal of Luminescence
基金
华南农业大学引进人才科研启动基金
国家自然科学基金(21171071
21071063
51203053)资助项目
关键词
水热共沉淀法
稀土离子
长余辉
硅酸镁锶
hydrothermal-coprecipitation method
rare earth ions
long-lasting phosphorescence
strontium magnesium disilicate
