摘要
采用溶胶鄄凝胶法制备了SrAl2O4∶Eu2+,Dy3+纳米长余辉发光材料,研究了pH值、反应温度和络合剂等对溶胶鄄凝胶形成的影响,研究了灼烧温度对SrAl2O4∶Eu2+,Dy3+晶相、颗粒尺度和发光性能的影响。利用XRD,SEM,光谱分析等手段对产物进行了结构和性能分析。实验结果表明,在800℃时SrAl2O4晶相开始形成但没有发光,而在1100℃烧结的样品则具有很好的发光性能。样品平均晶粒尺寸随灼烧温度升高而增加,平均晶粒尺寸为20~40nm。样品的激发光谱是峰值在240,330,378和425nm的连续宽带谱,发光光谱是峰值在523nm的宽带谱,与SrAl2O4∶Eu2+,Dy3+粗晶材料相比,发光光谱发生了“红移”现象。样品的热释光峰值位于157℃,与SrAl2O4∶Eu2+,Dy3+粗晶材料相比,峰值向低温移动了13℃。
Long persistent phosphorescence SrAl2O4:Eu2+,Dy3+ nanoparticles were synthesized through Sol-Gel method under a reducing atmosphere at lower temperature. The influences of pH value, reaction temperature and complexing agents, etc. on Sol-Gel process were studied. Effects of calcination temperatures on the crystalline phases, size and phosphorescence properties of SrAl2O4,:Eu2+,Dy3+ were also studied. The structure and properties of products were analyzed by XRD, SEM, Excitation spectrum, Emission spectrum and thermal-luminescence spectroscopy. The SrAl2O4, crystalline phase was initially formed at 800 degreesC. The SrAl2O4:Eu2+ Dy3+ nanoparticles with bright phosphorescence propertymere formed at 1100degreesC. The particles size was about 20similar to40 nm. Both the peaks of the excitation spectrum at 240, 330, 378, 425 nm and the peak of emission spectrum at 523 nm were shift to red wavelength compared with the SrAl2O4:Eu2+,Dy3+ coarse crystals.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2004年第12期1397-1401,共5页
Chinese Journal of Inorganic Chemistry
基金
吉林省自然科学基金资助项目(No.20000516)
兵器预研支撑基金项目(No.YJ0267047)