Measurement of fluorescence life time of single up-conversion nanoparticle

Hui LI; Zheng-yu GUI; Yong LIANG; Zhang-sen YU; Ai-guo WU

doi:10.3788/OPE.20172402.0319

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Measurement of fluorescence life time of single up-conversion nanoparticle

Modern Applied Optics | 更新时间：2020-07-07

- Measurement of fluorescence life time of single up-conversion nanoparticle
- Optics and Precision Engineering Vol. 25, Issue 2, Pages: 319-324(2017)
- 作者机构：
  
  1.中国科学院苏州生物医学工程技术研究所江苏省医用光学重点实验室, 江苏苏州 215163
  2.中国科学院磁性材料与器件重点实验室 & 功能材料与纳米器件事业部, 浙江宁波 315201
  3.中国科学院大学, 北京 100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20172402.0319
  CLC： TH742;O561
- Received：05 July 2016，
  
  Accepted：02 September 2016，
  
  Published：25 February 2017
- 稿件说明：
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Hui LI, Zheng-yu GUI, Yong LIANG, et al. Measurement of fluorescence life time of single up-conversion nanoparticle[J]. Optics and precision engineering, 2017, 25(2): 319-324.
DOI：

Hui LI, Zheng-yu GUI, Yong LIANG, et al. Measurement of fluorescence life time of single up-conversion nanoparticle[J]. Optics and precision engineering, 2017, 25(2): 319-324. DOI： 10.3788/OPE.20172402.0319.

摘要

为了表征上转换纳米荧光微粒的发光特性，设计了一个可以对单个纳米微粒进行荧光寿命测量的系统。该系统首先使用基于检流计振镜的双光子显微镜系统对单分散状态的上转换纳米微粒样品进行扫描成像。然后，通过单分子荧光纳米定位算法精确找出每个纳米微粒的准确位置，再依次将激光聚焦到每个纳米微粒上，在该点施加一个500

s宽度的激光脉冲，并通过光电倍增管探测随时间变化的荧光强度信号。最后对荧光衰减曲线进行拟合，计算得到该纳米微粒的荧光寿命。实验结果表明：单个上转换纳米荧光微粒的荧光发射曲线符合单指数衰减规律，其荧光寿命为195.3

s。与之相比，聚集状态的纳米微粒的荧光寿命为358.9

s。这表明聚集状态对上转换纳米微粒的发光特性有显著影响。

Abstract

In order to characterize the photon luminescence properties of up-conversion nanoparticles (UCNPs)

a system to measure fluorescence life time of single nanoparticle was established based on a custom-built two-photon microscope scanned with a pair of galvo-mirrors. First

a sample of mono-disperse UCNPs was imaged by the two-photon microscope. Then

the exact location of each nanoparticle was precisely determined through the single molecule fluorescence localization algorithm. The laser was focused on the nanoparticles one by one with a laser pulse with 500

s duration exerted on the nanoparticle. A photomultiplier was employed to measure the time-lapse fluorescence intensity which varied with time. Finally

the fluorescence decay curve was fitted to calculate the life time of single nanoparticle. The experiment results show that the fluorescence curves of single nanoparticle fit with single exponential decay

and the fluorescence life time is 195.3

s. For contrast

the life time of the bulk sample is 358.9

s. This indicates a dramatic effect of particle aggregation on the photon luminescence properties of UCNPs.

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Related Institution

School of Biomedical Engineering， University of Science and Technology of China

Jiangsu Key Lab of Medical Optics， Suzhou Institute of Biomedical Engineering and Technology， Chinese Academy of Sciences

Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences

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