水热法合成纳米晶NaYF4：Er^3＋，Tm^3＋，Yb^3＋的上转换发光特性  

The Upconversion Luminescence Properties of Nanocrystal NaYF_4∶ Er^(3+),Tm^(3+),Yb^(3+) Synthesized by Hydrothermal Method

作　　者：李岳[1] 翟海青[1] 杨魁胜[1] 张月平[2] 

机构地区：[1]长春理工大学材料科学与工程学院,吉林长春130022 [2]东北师范大学化学院应用化学系,吉林长春130024

出　　处：《发光学报》2009年第2期239-242,共4页Chinese Journal of Luminescence

摘　　要：以EDTA为络合剂,用水热法合成了Er3+,Tm3+和Yb3+共掺杂的NaYF4纳米晶。XRD和TEM的结果表明:粒径约为30 nm,属于六方晶系。在980 nm半导体激光器激发下,研究了不同Er3+离子掺杂浓度对Tm3+和Er3+离子上转换发光性能的影响,光强与泵浦功率的双对数曲线表明,474,525,539,650 nm的发射均属于双光子过程,408 nm的发射属于三光子过程。讨论了样品的协作敏化和声子辅助共振能量传递的上转换发光机制。Nanocrystals of up-conversion phosphor Er^3＋ , Tm^3＋ and Yb^3＋ co-doped NaYF4 were prepared by hydrothermal method in the prescence of complexing agent EDTA. Under 980 nm diode laser exciting, impact of different concentration of Er^3＋ ion on the up-conversion luminescence intensity was discussed. The samples were characterized by transmission electron microscopy and X-ray diffraction, the results showed that hexagonal nanocrystal NaYF4： Er^3＋ ,Tm^3＋ and Yb^3＋ was prepared by hydrothermal method. Ac- cording to the law of luminescence intensity versus excitation power, the 474 nm blue emission, 525 nm and 539 nm green emission, 650 nm red emission are all due to double photon process, while the 408 nm violet emission is a three-photon process. The up-conversion mechanism and processes were also analyzed.

关 键 词：水热法 上转换 纳米晶 NaYF4:Er^3+ TM^3+ YB^3+ 

分 类 号：O482.31[理学—固体物理]