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Proceedings Paper

Color control through FRET efficiency modulation using CDI (Conference Presentation)
Author(s): Karni Wolowelsky; Eric Guyes; Shimon Rubin; Matthew Suss; Moran Bercovici; Carmel Rotschild

Paper Abstract

Although much progress was made in light emitting devices, the ability to electrically control their spectral emission remains limited. We will present a novel approach and experimental results for dynamic color control, by electrically modulating the non-radiative Forster resonance energy transfer (FRET) efficiency between donor and acceptor dyes in a solution. FRET efficiency depends on the 6th power of the distance between donor and acceptor dye molecules, and thus, it is sensitive to variations in acceptor's concentration. Controlled acceptor concentrations could be achieved by attracting or repelling ionic dyes from the electrodes using a capacitive deionization (CDI) cell, with high surface area porous electrodes. This approach to dynamic color control may open new directions in 100% fill-factor displays, and can be expanded to energy saving applications such as controlling building’s external wall emissivity. We studied the modulation of a single dye emission using a CDI cell with negatively charged Fluorescein Sodium Salt in aquatic solution. Photoluminescence was measured along few charging-discharging CDI cycles and showed the ability to control extensive optical response through CDI. We experimented with two types of FRET-pair dyes: a) anion-cation, where the acceptor and the donor ions are oppositely charged, and b) zwitterion and ion, where the donor is neutral. We found that electrical control on FRET in aquatic solution is weak, due to hydrophobic attractive interaction between the acceptor and the donor. In order to avoid this effect, we are experimenting FRET control in organic solvents. These results will be presented in the talk.

Paper Details

Date Published: 21 April 2017
PDF: 1 pages
Proc. SPIE 10126, Advances in Display Technologies VII, 101260F (21 April 2017); doi: 10.1117/12.2251309
Show Author Affiliations
Karni Wolowelsky, Technion-Israel Institute of Technology (Israel)
Eric Guyes, Technion-Israel Institute of Technology (Israel)
Shimon Rubin, Technion-Israel Institute of Technology (Israel)
Matthew Suss, Technion-Israel Institute of Technology (Israel)
Moran Bercovici, Technion-Israel Institute of Technology (Israel)
Carmel Rotschild, Technion-Israel Institute of Technology (Israel)

Published in SPIE Proceedings Vol. 10126:
Advances in Display Technologies VII
Liang-Chy Chien; Tae-Hoon Yoon; Sin-Doo Lee, Editor(s)

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