Apr 9, 2025
11:00am - 11:15am
Summit, Level 4, Terrace Suite 2
Colleen Scott1,Roberto Venta1,Varunprasaath Selvaraju2,Stephen Barlow2,Seth Marder2
Mississippi State University1,Colorado University Boulder2
Colleen Scott1,Roberto Venta1,Varunprasaath Selvaraju2,Stephen Barlow2,Seth Marder2
Mississippi State University1,Colorado University Boulder2
Xanthene-based dyes (rhodamine and fluorescein) are known for their tunable, sharp and strong absorption bands in the visible region. They have structures that can reversibly switch between the closed, colorless form and an opened, highly colored form in response to an external stimulus. Additionally, in some cases the opened form is highly fluorescent. Consequently, these dyes are widely utilized in flow cytometry,
in vivo imaging,
in vivo sensing of bio-analytes, fluorescence correlation spectroscopy, and dye tracing. A recent report on their use as electrochromic materials has piqued our interest for developing xanthene-based dyes for such applications. Electrochromic materials change color in response to an applied potential. It is highly desirable for the process to be reversible when the applied voltage is reversed. Electrochromic materials have applications as smart windows in the automobile industry (rear-view mirrors) and for example in new airplanes (e.g., the passenger windows in Boeing 787 Dreamliners). Smart windows are also used in the construction industry to help improve the energy efficiencies in buildings during summer and winter months. They are also used as electronic tags, shelf labels, and in electronic displays. In this presentation, we will discuss some new developments of xanthene-based electrochromic dyes and polymers with switching speed on the order of 15- 20 seconds. We will discuss their synthesis, structural, optical, and electrochemical characterization, and switching characteristics. Additionally, we will provide a proposed mechanism for the switching states.