Photo-optical modulation of energy-saving electrochromic windows for high light transmission control

Jinbo Kim, Cheolhyun Cho, Hwandong Jang, Eunkyoung Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In the quest to reduce energy consumption, smart windows present a core solution to reduce the massive energy loss through windows. Smart windows can be designed on the basis of electrochromic (EC) principles, which offer simple integration mechanisms for color switching, optical sensing, energy harvesting, and energy storage. Photo-optical modulation of the EC window was explored using a thin film of polymer and a redox active electrolyte layer along with a dye-doped photoanode. The integrated photo-electrochromic window (PECW) showed high transparency over 78 % at bleached state but blocked 97 % of light at colored state. Furthermore, the PECW was capable of solar energy harvesting, allowing self-coloration under sunlight. The photo-optical modulation mechanism, material combination, and optimization of an autonomous PECW will be discussed.

Original languageEnglish
Title of host publicationOrganic Photonic Materials and Devices XXIV
EditorsWilliam M. Shensky, Ileana Rau, Okihiro Sugihara
ISBN (Electronic)9781510648678
Publication statusPublished - 2022
EventOrganic Photonic Materials and Devices XXIV 2022 - Virtual, Online
Duration: 2022 Feb 202022 Feb 24

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceOrganic Photonic Materials and Devices XXIV 2022
CityVirtual, Online

Bibliographical note

Funding Information:
This research was supported by a National Research Foundation (NRF) grant funded by Korean government (Ministry of Science, ICT & Future Planning, MSIP) through the Global Research Lab (GRL: 2016K1A1A2912753) and Creative Materials Discovery Program (2018M3D1A1058536). This research was supported by AOARD, Air Force Office of Scientific Research (AFOSR) under the Grant number FA9550‐19‐S‐0003.

Publisher Copyright:
© 2022 SPIE.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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