Design Of Measurement System Of Fluorescence In Microscopy And Luminescence Properties Of TDSB Organic Single-crystal Nanowires

This work focus on the design and improvement of the spectrum measurement system which skillfully integrate several function of measurement and acquisition in one system of experiment.Aimed at the study on the TDSB organic crystal nanowires,all data are obtained from the measurement system equipped with self-designed microscopic optical circuits only for this dissertation.By taking advantage of both steady state fluorescence spectral properties and the time-resolved spectroscopy technology,steady state fluorescence spectral properties and its fluorescence kinetics parameters of organic single crystal nanowires can be measured.The purport of the paper can be summarized as follows:It is successfully to have completed the microscopic fluorescence spectrum measurement system.The measurement system is made u p of femtosecond pulse laser,optic multichannel analyzer time-correlated single photon counter(TCSPC)and microscopic optical circuit,which has three functions: microscopic image acquisition function which realize enlargement of image at 720 time,steady state fluorescence spectrum acquisition function whose range in spectrum-detection span 400~1000nm and fluorescence kinetics parameters acquisition function whose time-resolution minimize order~50ps.In addition,the system is qualified with high spatial and time resolution during the process of data recording.The luminescence properties of TDSB organic single crystal nanowires either pure or doped with DCM have been studied by both steady state fluorescence spectral and the time-resolved spectroscopy technology.First of all,carrying out the experiments under the condition of fluorescence spectral for DCM either in pure or doped situation,which shows variation of emission peaks in nanowires and red-shift in feature peaks of TDSB takes place while the concentration of DCM varies from 0 to 15%,and what is more,DCM fluorescence peak intensity rises in comparison with TDSB proving a possible energy transfer between the subject and object of nanowires.Secondly,after making an analysis on the changes of fluorescence kinetics parameters of TDSB in the form of either pure or doped with DCM situation,the findings show that fluorescent lifetime of single crystal is the longest.However,the fluorescent lifetime seems gradually to be diminished with the intensifying of DCM concentration while the fluorescent lifetime of DCM becomes longer with the intensifying of DCM concentration,which proves there must be an Energy transfer among nanowires and it is also possible to estimate its transfer efficiency.Finally,making a careful study on the loss of fluorescence transmitting,the paper dwells on the fact that the loss ratio varies when nanowires carries lights in different wave-length,moreover,the loss ratio usually diminishes with the increase of wave-length.When wave-length remains unchanged,the loss ratio of fluorescence transmitting increases with doping concentration.