Preparation And Propertie Investigation Of Electrochromic Materials Based On Photonic Crystal Structure

Due to their unique optical-electronic properties, electrochromic materials(EMC) have potential applications in various fields, such as display devices, smart window, electronic paper, military camouflage, information storage and so on. Photonic crystals can control the generate of photons and the spreed of light because of the unique ability to control light. In this paper, in order to improve the electrochromic properties of electrochromic materials, we introduced the photonic crystal structure into prussian blue(PB) and poly(3,4-ethylenedioxythiophene)(PEDOT), and conducted a series of research:1. Monodisperse silica microspheres were synthesized using the St?ber method and the photonic crystals were prepared. The core-shell structured SiO2@PEDOT opal photonic crystal film was prepared by an electrochemical method. The cyclic voltammogram performance of SiO2@PEDOT photonic crystal was similar with that of pure PEDOT. The maximum contrast vlue increased 12.4%. The oxidation and recovery time became shorter.2. The core-shell structured SiO2@PB opal photonic crystal film was prepared by using SiO2 photonic crystal as the template. The cyclic voltammogram performance of SiO2@PB photonic crystals was better than pure PB. The maximum contrast value increased 17%. The colored and fading time were significantly shorter.3.Four different size monodisperse polystyrene microspheres(173 nm, 242 nm, 290 nm and 318 nm) were synthesized using the soap- free emulsion polymerization method, and four different color photonic crystals(red, orange, green and blue) were obtained by using vertical deposition technique. Four different PS@PEDOT composite films were obtained by electrochemical polymerization PEDOT on the PS photonic crystal. The results showed that: the electrochemical properties of PS@PEDOT composite films were better than that of pure PEDO T film, in which the PS@PEDOT290 composite film had the best performance with a contrast ratio of 34%, and its response time reduced.4. Four different inverse opal structured PEDOT films were obtained after removed the PS microspheres. The measurement results indicated that these PEDOT films were still orderliness, and the PEDOT film with the minimum pore had the best the orderliness and cyclic stability. The contrast of four inverse opal PEDOT film were all increased with a maximum value of maximum, however, the corresponding time increased.In this paper, the photonic crystal structure was introduced into the film of electrochromic materials. The resulted composite films had increased redox ability and contrast value with bright and vibrant colors. All these results indicated that introducing the photonic crystal structure into the e lectrochromic films can improve the electrochromic performance of e lectrochromic materials, which expand the practical application of electrochromic materials.