物理化学学报 >> 2010, Vol. 26 >> Issue (07): 2031-2036.doi: 10.3866/PKU.WHXB20100715

材料物理化学 上一篇    下一篇

长波敏化发光铕配合物纳米粒子的制备与表征

邵光胜, 薛富民, 韩荣成, 汤敏贤, 王远   

  1. 北京大学化学与分子工程学院, 分子动态与稳态国家重点实验室, 北京分子科学国家实验室, 北京 100871
  • 收稿日期:2010-02-02 修回日期:2010-03-27 发布日期:2010-07-02
  • 通讯作者: 王远 E-mail:wangy@pku.edu.cn

Synthesis and Characterization of Europium Complex Nanoparticles with Long-Wavelength Sensitized Luminescence

SHAO Guang-Sheng, XUE Fu-Min, HAN Rong-Cheng, TANG Min-Xian, WANG Yuan   

  1. Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2010-02-02 Revised:2010-03-27 Published:2010-07-02
  • Contact: WANG Yuan E-mail:wangy@pku.edu.cn

摘要:

以牛血清白蛋白(BSA)为保护剂, 利用沉淀法制备了平均粒径为35 nm的Eu(tta)3dpbt (dpbt = 2-(N,N-二乙基苯胺-4-基)-4,6-二(3,5-二甲基吡唑-1-基)-1,3,5-三嗪, tta = 噻吩甲酰三氟丙酮负离子)荧光纳米粒子. BSA保护Eu(tta)3dpbt纳米粒子在水中分散稳定性高, 光稳定性好, 长波敏化发光性能优良. 其在可见光区激发峰位于415 nm, 激发峰尾部延展至470 nm, 发光量子产率为0.20 (λex=415 nm, 25 ℃). 在近红外双光子激发下可发出纯正的红光, Eu(tta)3dpbt纳米粒子最大双光子激发作用截面为2.4×105 GM (λex=830 nm, 1 GM=10-50 cm4·s·photo-1·particle-1).

关键词: 荧光纳米粒子, 铕配合物, 长波敏化发光, 双光子激发, 荧光生物探针

Abstract:

Luminescent nanoparticles (dav=35 nm) of Eu(tta)3dpbt (dpbt= 2-(N,N-diethylanilin-4-yl)-4,6-bis (3,5-dimethylpyrazol-1-yl)-1,3,5-triazine, tta=thenoyltrifluoroacetonato) protected by bovine serum albumin (BSA) were prepared by a precipitation method. These particles disperse well in aqueous solutions to form stable and transparent colloidal solutions. The BSA-protected Eu(tta)3dpbt nanoparticles exhibit high photostability and excellent long-wavelength sensitized EuIII luminescence properties. The quantum yield of EuIII luminescence is 0.20 (λex=415 nm, 25 ℃), and the excitation band for the EuIII luminescence centers at 415 nm and extends to 470 nm. Upon two-photon excitation, the prepared nanoparticles emit pure-red light with a two-photon excitation action cross section of 2.4×105 GM (λex=830 nm, 1 GM=10-50 cm4·s·photo-1·particle-1). The prepared nanoparticles and the reported preparation method are promising for the development of luminescent bionanoprobes with excellent biocompatibility and luminescent properties.

Key words: Luminescent nanoparticles, Europiumcomplex, Long-wavelength sensitized luminescence, Two-photon excitation, Luminescent bioprobe

MSC2000: 

  • O648