Effect of solvents on the photoluminescence emission of a few novel, light emitting, segmented block copolymers and hybrid polymers

Numerous light emitting polymers and copolymers with excellent luminescence characteristics and thermal stability are being synthesized and extensively investigated for applications as emissive layers in polymer light emitting diodes. In the present study, three novel, thermally stable, segmented block copolymers (SBC) and two hybrid polymers with excellent photoluminescence (PL) and electroluminescence emission (EL) characteristics were subjected to spectroscopic investigations to explore the effect of various aromatic and non-aromatic solvents on the photoluminescence emission characteristics. Dilute solutions of the SBCs and the hybrid polymers were made from various solvents like dichloromethane, chlorobenzene, tetrahydrofuran, xylene, chloroform, etc. UV-Vis absorption and PL emission spectra of these polymer solutions were recorded simultaneously. No significant changes in the PL emission peaks were observed, depending on the nature of solvents. The effect of solvents in terms of aggregation effects in these polymers was studied. The low aggregation effects and solvent independent nature of the polymers offer very high prospects in various optoelectronic device applications. The present study can be of great use in designing efficient polymer LEDs based on these SBCs and hybrid polymers as emissive layers. The efficiency and stability of the polymer LEDs can be considerably improved by suitably choosing the solvent for the emissive polymers.