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Electrically Activated UV-A Filters Based on Electrochromic MoO_3-.

Aram Arash¹, Sherif Abdulkader Tawfik², Michelle J S Spencer²

¹Functional Materials and Microsystems Research Group and the Micro Nano Research Facility, RMIT University, Melbourne, VIC 3001, Australia.

ACS Applied Materials & Interfaces

|March 24, 2020

Summary

Researchers developed new electrically activated ultraviolet (UV) filters using molybdenum trioxide (MoO3-). These filters offer tunable UV light transmission for advanced optical applications.

Keywords:

ECD electrochromism molybdenum oxide optical filters vapor deposition

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Area of Science:

Materials Science
Optoelectronics
Nanotechnology

Background:

Chromism-based optical filters are limited by the scarcity of suitable electrochromic materials.
Electrochromic transition metal oxides like MoO3 and WO3 are commonly used in smart windows and electrochromic devices (ECDs).

Purpose of the Study:

To report novel MoO3--based electrically activated ultraviolet (UV) filters.
To demonstrate tunable optical transmittance for UV filtering applications.

Main Methods:

MoO3- was grown on an indium tin oxide (ITO) substrate.
The MoO3--ITO was mechanically assembled onto an electrically activated proton exchange membrane.
Reversible proton (H+) injection and extraction were used to modulate optical transmittance.

Main Results:

The developed devices function as electrically activated optical filters with broadband transmission modulation from 325-800 nm.
A peak transmission modulation of approximately 60% was observed in the UV-A range (350-392 nm).
Switching times of 8 seconds and a coloration efficiency up to 116 cm2 C-1 were achieved.

Conclusions:

MoO3--based materials are effective for creating electrically activated UV filters.
The reversible proton exchange mechanism enables tunable optical properties for advanced filtering.
These filters show promise for applications requiring dynamic control of UV light transmission.