Volume : 4, Issue : 11, November - 2015

Photophysical and Elecroluminescent properties of PQ

Pratima V. Damre, Dr. V. M. Raut

Abstract :

<p>The thermal, electrochemical, photophysical, and electroluminescent properties of the new polyquinolines varied with the arylene linkage, including p-phenylene,4,4&prime;-biphenylene,stilbene,5,5&prime;-bithienylene,bis(thienyl)vinylene,and3,7- phenothiazinylene. The new conjugated polymers combined high glass transition temperature (110-254 &deg;C) with quasireversible electrochemical reduction from which 2.72-3.00 eV electron affinities were estimated. The optical band gap varied from 2.19 to 2.86 eV whereas the photoluminescence emission maximum varied from blue-green (477 nm) to deep red (646 nm). Some of the new polymers with alternating donoracceptor architecture showed strong intramolecular charge transfer. Electroluminescence of moderate ightness (up to 209 cd/m2) was achieved with blue-green, green, yellow, orange, and deep red colors depending on the arylene linkage of the copolymer.</p>