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Tunable photonic performance of three dimensional macroporous tungsten oxide

DENGTENG GE1, YANBO DING2, ZHONGQIU TONG1, WUHONG XIN1, ZHENYU LI1, LILI YANG3,*

Affiliation

  1. Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin, 150080, P.R. China
  2. School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, P.R. China
  3. School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin, 15009 0, P.R. China

Abstract

Electrochromic materials with photonic crystal structures attract enormous interest and have potential applications as smart thermal control coatings due to the tunable optical switching performance. Here we report tungsten oxide s (WO3 films with three dimensional macroporous structures electrochemically fabricated through polystyrene (PS) colloidal crystal templates. Their switching photonic performance through electrochromic process was studied experimentally and theoretically UV Vis NIR spectra of WO3 /PS photonic crystals show that abnormal red shift of band gap occurs during the infiltrated of tungsten oxide or the bleaching process. It is deduced that the switching of photonic performance is weaken due to the absorption of infiltrated tungsten oxide. An effective fraction of materials involved in the Bragg effect φ trans was introduced here to describe the effect of absorption on the photonic structures. It is obtained that 60% of WO3 in tungsten oxide electrochromic photonic crystals are involved due to their absorption..

Keywords

Tungsten oxide, Tunable photonic crystals, Absorption, Electrochromic.

Citation

DENGTENG GE, YANBO DING, ZHONGQIU TONG, WUHONG XIN, ZHENYU LI, LILI YANG, Tunable photonic performance of three dimensional macroporous tungsten oxide, Optoelectronics and Advanced Materials - Rapid Communications, 6, 9-10, September-October 2012, pp.793-796 (2012).

Submitted at: May 16, 2012

Accepted at: Sept. 20, 2012