Ce^(3+),Mn^(2+)共掺NaYF_4微米六棱柱的发光性能和能量传递研究  

Photoluminescence Properties and Energy Transfer of Ce^(3+),Mn^(2+) in NaYF_4 Micro-Sized Hexagonal Prism

作　　者：相广欣 王娇[2] 陆良吉 杨昕昕[1] 张志军[1] 赵景泰[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]复旦大学信息科学与工程学院,上海200433

出　　处：《中国稀土学报》2017年第1期42-48,共7页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(51402184)资助

摘　　要：通过水热法合成了单分散的六方相NaYF_4:5%Ce^(3+),x%Mn^(2+)(摩尔分数,x=0,5,10,15)微米六棱柱。扫描电镜(SEM)分析表明,样品尺寸均匀,平均长度和平均高度约为2.02μm和700 nm。NaYF_4:5%Ce^(3+),x%Mn^(2+)发光性质的研究结果表明,在激发谱中,245 nm的激发峰来自于Ce^(3+)的4f→5d跃迁;332 nm的激发峰对应于Mn^(2+)的6A1(6S)→4E(4D)跃迁和自陷激子(STE)的激发。在发射谱中,302和422 nm的宽带发射峰分别对应Ce^(3+)的5d→4f跃迁和基质中自陷激子的发光;538和587 nm的宽带发射峰分别对应Mn^(2+)的~4A_1(~4G)→6A1(6S)跃迁和4T1(4G)→6A1(6S)跃迁。随着Mn^(2+)含量的增加,Ce^(3+)的发射强度逐渐减弱,而Mn^(2+)的538 nm(~4A_1(~4G)→6A1(6S))发射峰强度逐渐增强,这表明在NaYF_4基质中,存在Ce^(3+)和Mn^(2+)之间的能量传递。Monodispersed 5% Ce^3＋,x% Mn^2＋（x = 0,5,10,15） co-doped NaYF4micro-sized hexagonal prisms were synthesized via the hydrothermal synthesis. The average diameter and height were about 2. 02 μm and 700 nm,respectively. Upon ultraviolet excitation,5% Ce^3＋,x% Mn^2＋co-doped hexagonal NaYF4 showed the excitation peaks at 245 and 332 nm in the excitation spectrum,attributing to the 4f→5d transition of Ce^3＋,6A1（6S）→4E（4D） of Mn^2＋and the excitation of self-trapped exciton of the host lattice,respectively. The emission peaks at302,420,538,587 nm in the emission spectrum,corresponding to the 5d→4f transition of Ce^3＋,the emission of self-trapped exciton of the host lattice,^4A1（^4G） →6A1（6S） and4T1（4G） →6A1（6S） of Mn^2＋,respectively. With increasing Mn^2＋concentration,the emission intensity of Ce^3＋and Mn^2＋gradually decreased and increased,respectively,indicating the energy transfer from Ce^3＋to Mn^2＋.

关 键 词：NAYF4 CE^3+ MN^2+ 能量传递 

分 类 号：O43[机械工程—光学工程]