摘要
用微乳液法合成出SiO2包覆的Er3+掺杂的Y2O3粉体。X射线衍射结果表明,所制备粉体为立方Y2O3结构。透射电镜照片显示,其颗粒形状近似为球形,粒径为20~50 nm。该粉体在波长为980 nm的半导体激光器激发下发射出中心波长为562 nm的绿色和660 nm的红色上转换荧光,分别对应于Er3+离子的4S3/2/2H11/2→4I15/2跃迁和4F9/2→4I15/2跃迁,发光强度和激发功率的关系揭示其均为双光子过程。Er3+掺杂的Y2O3粉体具有高效的上转换发光性能,而经过纳米复合后制成的Y2O3(核)/SiO2(壳)在水溶液中具有较好的悬浮性,这对于其在生物荧光标记的应用具有重要意义。
The Y2O3∶Er3＋ nanometer phosphors coated with SiO2 was synthesized by the microemulsion method.The X-ray diffraction results showed that the as-prepared powders were cubic phase of Y2O3.The TEM pictures demonstrated that the powders have the nearly spherical and the average diameter of the particles was in the range of 60~80 nm.Under the excitation of 980 nm diode laser,a very strong green emission centered at 562 nm and a red emission centered at 660 nm were observed,which were assigned to the transitions of 4S3/2/2H11/2→4I15/2 and 4F9/2→4I15/2 energy levels of Er3＋ ions,respectively.The research on luminescent intensity and the exciting power relations revealed that this up-conversion process was a two-photons absorption process.Because Y2O3（nucleus）/SiO2（shell） has highly effective performance on the up-conversion luminescence and was easy to dissolve in the water and united with organic matter and biological member,the application of this nanometer nuclear-shell structure material in the biological fluorescence mark domain is significance.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2011年第4期342-346,共5页
Chinese Journal of Luminescence
基金
内蒙古自然科学基金(2009MS0803)
科研院所技术开发专项资金(2010EG113041)资助
关键词
纳米荧光粉
反相微乳液法
上转换发光
纳米核壳结构
nanometer phosphors
reverse microemulsion method
up-converting luminescence
nanometer nuclear-shell structure
