Study On Special Fluorescence Spectra Property And Fluorescence Detection From Organic Crystals

How time flies! Chemistry as one of the most vital basic science has been investigated for hundreds of years. In the past period, numerous researchers had made indelible contributions to the progress of human civilization. It is the hard working by these earlier scientists; we have such a beautiful life today.As early as 1960s, the first laser beam was appeared in human history, which means the Human Sciences Research came into a novel period. Till today, human never stop the explorer in this research field. In recent years, organic light emitting displayed technology and organic solar cell technology switched to industrial production from scientific research. So the research of organic photoelectric materials gradually became a hot topic now. Based on the research background, this paper focuses on the following three aspects.1: In the first part of paper, a fluorescence detection system with temperature adjustment equipment was set up, using xenon lamp as the light source. With the help of monochromatic, laser beam focused on the surface of samples, and the fluorescence signal had been collected by optical fiber. Whileswitching temperature, the fluorescence spectra of organic light-emitting materials had slit changes. DSA chloroform solution was chosen as the research subject. The temperature dependent fluorescence spectra of DSA chloroform solution were analyzed. When DSA chloroform solution's state is solid, the molecule rotation and vibration was impacted by the states, resulting in the conclusions that fluorescence intensity and fluorescence peak position changed with temperature.2: In the second part, a detection system that measure the amplified spontaneous emitting (ASE) of organic crystals was set up. The laser beam of 405nm was used as the excitation source, and CCD was taken to collect fluorescence signal. The An-2F crystals ASE phenomenon was studied. When the laser power's threshold was 0.5mJ/cm-2, and crystal fluorescence spectrum width at half maximum(FWHM) was 5nm the An-2F crystal showed ASE phenomenon. This research showed that in the development of solid-state laser, An-2F crystal had a lower threshold of ASE excitation power, narrow half-peak width, and a good prospect.3: The third part of the work based on the above part of work, by measuring the fluorescence polarization of crystals fluorescence, which kind of crystal could be used in solid-state lasers was discussed. The nature of the fluorescence polarization spectra of TBSA crystals was studied. A very good fluorescence polarization phenomenon and the self-waveguide effect of TBSA crystal were discovered. Not only crystal fluorescence can be spread along the long axis of the crystal, but also has a top emission phenomenon. This conclusion provided the evidence to the further study of organic light-emitting materials for solid-state lasers for further application.