基于猝灭荧光素的一种TCSPC仪器响应函数测量方法  

Quenched Fluorescein:A Reference Dye for Instrument Response Function of TCSPC

作　　者：潘海峰[1] 丁晶新[1] 梁荣荣[1] 陶占东 刘梦薇[1] 张三军[1] 徐建华[1] 

机构地区：[1]华东师范大学,精密光谱科学与技术国家重点实验室,上海200062

出　　处：《光谱学与光谱分析》2014年第8期2284-2288,共5页Spectroscopy and Spectral Analysis

基　　金：上海市教委晨光项目(11CG24);中央高校基本科研业务费专项资金项目资助

摘　　要：根据荧光物质的动态猝灭作用原理,将碘化钠饱和水溶液与碱性荧光素水溶液按照特定的比例混合,利用时间分辨设备测量猝灭后的荧光素荧光寿命。实验观察到随着碘化钠饱和溶液浓度的增加,测量得到的荧光寿命逐步从4ns减小至24ps左右。如将猝灭荧光素作为仪器响应函数的标准样品,与通常作为标准样品的二氧化硅纳米颗粒悬浮液进行对比,实验结果显示两者非常吻合,表明猝灭荧光素可以作为荧光衰减测试中的标准样品,进一步研究发现这种新的标准样品一方面避免了传统测量手段中需要在不同探测波长反复测量仪器时间响应函数的问题,更有效地减小了实验中颜色效应造成的实验误差。有望在时间分辨荧光光谱和荧光寿命成像等研究中得到应用。Measuring the instrument response function （IRF）and fitting by reconvolution algorithms are routines to improve time resolution in fluorescence lifetime measurements.Iodide ions were successfully used to quench the fluorescence of fluoresce-in in this study.By systematically adding saturated NaI water solution in basic fluorescein solution,the lifetimes of fluorescein were reduced from 4 ns to 24 ps.The quenched lifetime of fluorescein obtained from the analysis of Time-Correlated Single Pho-ton Counting （TCSPC）measurement agrees well with that from femtosecond frequency up-conversion measurement.In time re-solved excitation spectra measurements,the IRF should be measured at various detection wavelengths providing scattring materi-als are used.This study could not only reduce the complexity of IRF measurement,but also avoid the existing color effect in sys-tem.This study should have wide applications in time resolved fluorescence spectroscopy and fluorescence lifetime imaging.

关 键 词：时间分辨荧光光谱 荧光素 碰撞猝灭 仪器响应函数 

分 类 号：O433[机械工程—光学工程]