Luminescent Properties Of Two Organic Compounds(Photoluminescence/Chemiluminescence) And Further Application

Organic luminescent compounds hold an important position in luminescent materials. With the development of society and technology, organic luminescent compounds have been widely applied in many fields, such as optoelectronic devices, fluorescence detection and analysis, preparation of luminescent composites. In order to obtain materials with excellent luminescence, it is necessary to investigate deeply the luminescent properties and luminescence improvement.In this paper, the luminescence properties of two organic compounds and further application were studied, including photoluminescent of organic dye Coumarin6in polymer/alkoxysilane hybrid nanoparticles and chemiluminescence of luminol-H2O2in alkaline environment. The main researches were listed as follows:1. Coumarin6(C6) doped fluorescent hybrid nanoparticles (NPs) were prepared by a reprecipitation-encapsulation method, which could effectively avoid fluorescence quenching of C6in water. With SEM and DLS, the hybrid NPs were firstly characterized. The concentration-dependent fluorescence of C6-doped NPs was then studied, and finding that the fluorescence of C6inside NPs was quenched by intermolecular energy transfer rather than by aggregation. More, polymers with different chemical structures could influence emission spectra of C6inside NPs.2. By direction of one protein poly-L-lysine (PLL), the silver nanoparticles’(Ag NPs) growth in situ on surface of C6-doped polymer/alkoxysilane hybrid NPs was achieved, thus we obtained a novel fluorescent nanocomposite. Its morphology was characterized by TEM. Then, the nanocomposites were used to intracellular imaging, and finding that they can be incorporated into HepG2cancer cells, while maintaining a strong green fluorescence inside cells. So this nanocomposites of Ag NPs-modified hybrid nanoparticles are biocompatible.3. The enhancement of chemiluminescence in luminol-H2O2-glutaraldehyde system was investigated. The changes of emission spectral, intensity, dynamic curves of the system with or without glutaraldehyde were studied. Results showed that glutaraldehyde can enhance the CL intensity, and the CL was still generated from the excited state of3-aminophthalate which was the oxidate of luminol. In addition, we study the effect of luminol concentration, glutaraldehyde concentration and H2O2concentration on CL intensity.