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Electrically Activated UV-A Filters Based on Electrochromic MoO3-x.

Aram ArashSherif Abdulkader TawfikMichelle Jeanette Sapountzis SpencerShubhendra Kumar JainSaba ArashAishani MazumderEdwin Lawrence Harrop MayesFahmida RahmanMandeep SinghVipul BansalSharath SriramSumeet WaliaMadhu BhaskaranSivacarendran Balendhran
Published in: ACS applied materials & interfaces (2020)
Chromism-based optical filters is a niche field of research, due to there being only a handful of electrochromic materials. Typically, electrochromic transition metal oxides such as MoO3 and WO3 are utilized in applications such as smart windows and electrochromic devices (ECD). Herein, we report MoO3-x-based electrically activated ultraviolet (UV) filters. The MoO3-x grown on indium tin oxide (ITO) substrate is mechanically assembled onto an electrically activated proton exchange membrane. Reversible H+ injection/extraction in MoO3-x is employed to switch the optical transmittance, enabling an electrically activated optical filter. The devices exhibit broadband transmission modulation (325-800 nm), with a peak of ∼60% in the UV-A range (350-392 nm). Comparable switching times of 8 s and a coloration efficiency of up to 116 cm2 C-1 are achieved.
Keyphrases
  • high speed
  • high resolution
  • transition metal
  • photodynamic therapy
  • mass spectrometry
  • structural basis