Electrochemical Fluorescence Switching from a Patternable Poly(1,3,4‐oxadiazole) Thin Film

Abstract

A highly soluble poly(1,3,4-oxadiazole) (POD) substituted with long alkyl chains was examined for electrochemical fluorescence switching. The high solubility of the polymers enabled a simple fabrication of an electrochemical cell, which showed reversible fluorescence switching between dark (n-doping) and bright (neutral) states with a maximum on/off ratio of 2.5 and a cyclability longer than 1000 cycles. Photochemical cleavage of the oxadiazole in POD allowed photo-patterning of the POD film upon exposure to UV source. The patterned POD films displayed patterned image reversibly under a step potential of +1.8/-1.8 V.

Electrochemical fluorescence switching properties of conjugated polymers composed of triphenylamine, fluorene, and cyclic urea moieties

“…In addition, fluorescence emission shows high sensitivity on response to environmental conditions. Because of these interesting properties, the redox fluorescence switching has been subject of research for potential applications such as fluorescent imaging, sensors, displays, spectroscopy, and many other optoelectronic applications 10–26…”

“…However, due to the poor miscibility of many fluorescent polymers with polymeric electrolytes, the EFD applications are limited. Recently, a novel n‐type doping poly(oxadiazole) (POD)26 that enables easy fabrication of EFD has been reported. The POD exhibits a reversible change in the fluorescence properties by repetitive transformation between its reduced state (nonfluorescent) and the neutral state (fluorescent) with a maximum on/off ratio of 2.5.…”

Tuning the Fluorescent Response of a Novel Electroactive Polymer with Multiple Stimuli

“…Recently, electricity‐dependent fluorescence switching systems have attracted attention and are predicted to have important applications in the field of electro‐optical devices and information displays. As the oxidative states of oligoanilines can be regulated easily by chemical and electrical methods, the fluorescence of EPOP film was studied in detail at different applied potentials (from −0.2 to 1.0 V) via spectroelectrochemical measurements.…”

Electroluminochromic Materials and Devices

“…Copyright 2014, WILEY‐VCH. (d) Possible resonance forms of anion structure of 29 and 30 ; fluorescence intensity microscope and AFM images of 29 with line patterns; the inset shows the reversible fluorescence switching images of the patterned 29 at +1.8 and −1.8 V. Reproduced with permission . Copyright 2011, WILEY‐VCH.…”