Two novel multicomponent copolymers (P1 and P2) containing polyfluorene (PF), oligo(phenylenevinylene) (OPV), and porphyrin (Por) derivatives were synthesized according to the Suzuki polymerization method. The structures, optical, and electrochemical properties of the two model compounds (OPV and Por) and multicomponent copolymers were characterized by 1 H NMR, FTIR, elemental analysis, UV-vis spectroscopy, photoluminescence, and cyclic voltammetry, respectively. Both of the copolymers exhibit thermotropic liquid crystalline properties and represent the characteristic Schlieren textures in a wide temperature range. Electroluminescence spectra of these copolymers exhibit broadband emissions covering the entire visible region from 400 to 700 nm. The single layer polymer light emitting diodes device based on P2 with a configuration of indium tin oxide/poly(ethylenedioxythiophene): poly(styrenesulfonic acid)/polymers/Ca/Al emits white light with the Commission Internationale de l 0 Eclairage chromaticity coordinates of (0.29, 0.30), maximum brightness of 443 cd/m 2 . The white-light-emitting devices based on the novel multicomponent copolymers exhibit low turn-on voltage, and good color stability at different driving voltages as well. V a Calculated from GPC (eluent: THF; polystyrene standards). b The glass transition temperature obtained by DSC under nitrogen at a heating rate of 10 C/min. c Temperature at 5% weight loss by a heating rate of 20 C/min under nitrogen. d Determined by polarized optical microscope.
5296LI ET AL.