921-925The Cyclic Voltammetry investigation and optical properties
of some of the commonly used conjugated polymers for the fabrication of organic
LEDs, like poly [2-methoxy 5- (2'-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), poly
[2,3-bis (2-ethylhexyloxy)1,4-phenylenevinylene] (BEH-PPV) and poly[(9,9'-di(2'-ethylhexyl)
fluoren-2,7-yleneethynylene] (PFE)
for three principal emission colours red, green and blue, respectively have
been reported. Both oxidation and reduction potentials of polymers were
determined under the same experimental conditions to estimate the ionization
potential (Ip: energy of Highest Occupied Molecular Orbital)
and electron affinity (Ea: energy of Lowest Unoccupied
Molecular Orbital). The optical band gaps of the polymers were obtained from
their optical absorption spectra. A comparative study of the electrochemical
and optical bandgap of the polymers has been made. The photoluminescence (PL)
of the polymers has also been studied