The Preparation Of Nanoparticle Based One-dimension Photonic Crystals And Its Application On Controlling Emitting

In this paper, a simple, traditional sol-gel method was employed to preparedstable SiO2, TiO2sol and the mechanical spin coating was also utilized to depositone-dimension photonic crystals and its defect structure with highly reflectiveproperties. The fracture surface was characterized by field emission electronmicroscopy. UV-visible absorption spectroscopy (UV-Vis) was used to characterizethe stop band of photonic crystal and its defect structure. we explored the conditionsrequired for a highly reflective quality photonic crystal through changing rotationspeed, sol concentration, treatment temperature and spin coating number whichdetermine the intensity and location of the reflection spectrum.The integration of organic light-emitting Rhodamine B into the photonic crystalsand its defect structure was realized by penetration. The filtration barrier ofRhodamine B emission spectra of different regions is achieved by controlling thephotonic crystal band gap position. Fluorescence spectroscopy (PL) was used mainlyfor the characterization of Rhodamine B. Before and after modification, theconclusions are as follows: the photonic crystal band gap of the barrier function offilter allows Rhodamine B emission spectrum changes in shape, strength, etc. Theemission of Rhodamine B in defect structure photonic crystal is accordance with theposition of the optical cavity strictly, which has a high efficiency on increasingemission intensity.ZnO quantum dots with anout5to7nm diameter prepared through relativelysimple liquid phase method, and was characterized by TEM, XRD, TG-DTA. By mixingthe quantum dots of the zinc oxide and silica-titania sol, the integration of thequantum dots to the photonic crystal was achieved. The controlling of the photoniccrystal band was employed to restrict the emission spectra of zinc oxide in differentlocations, and thus the spectra of zinc oxide shape, strength, location and a full rangeof modification. It is demonstrated that photon is in strict accordance with theposition of the reflector cavity to escape in defect photonic crystal. Energy wasfoucus on optical cavity and then emitted. This results in high intensity and narrow half-peak width of the emission peak.