Controlling the Photoluminescence from a Laser Dye through the Oxidation Level of Polypyrrole

Abstract

In situ spectroelectrochemistry was used to study the emission of the laser dye oxazine 720 (oxa720) embedded into a polypyrrole (ppy) matrix. The photoluminescence (PL) of the dye was found to be controlled by the oxidation level of ppy. It is suggested that a Förster resonance energy transfer (FRET) mechanism is involved in the potential‐controlled PL. FRET calculations were used to determine the dependence of the apparent distance between the dye molecules and the polymer chain with the oxidation level of ppy. In the reduced state, at −0.9 V, an efficient FRET process quenches the PL from the dye due to the short distance between the dye molecules and the polymer chains. In the oxidized state, at +0.9 V, the FRET efficiency is only 24% leading to higher PL intensity, due to the larger distance between the donor (oxa720) and the acceptor (ppy).magnified image

Electrochemical Control of Light Transmission through Nanohole Electrode Arrays

“…14 The amount of light that PPy absorbs at a particular wavelength range is associated with its oxidation states. 14,51,59 Therefore, each applied potential in the cyclic voltammetry scan can modulate the optical properties of the polymer films and consequently results in a change in the transmission-SPR intensity of the modified nanoholes array. The transmission-SPR intensity is proportional to the applied potentials (Figures 3b and 2b), indicating that the extent of the transmitted light intensity through the PPy-modified nanoholes array can be fine-tuned and adjusted by electrochemical potential.…”

Reversible isomerization of a zwitterionic polysquaraine induced by a metal surface

“…Polymers with extended p-electron conjugation that have unique intrinsic conductivity are classified as conjugated polymers or conducting polymers (CP)s; [1][2][3] these compounds exhibit novel electrical, optical and magnetic phenomena that can lead to optoelectronic, [4][5][6][7] solar cell, 8-10 sensor [11][12][13] and biomedical applications. [14][15][16] The polymeric nature of a CP enables great structural flexibility; CPs thus attract attention and remain at the forefront of many areas of development.…”