Studies on Föster resonance energy transfer in blends of thienylene vinylenes for white light emitting diodes

Abstract

Conjugated polymer blends are widely used for realization of white light emitting diodes (WPLEDs). The theoretical understanding of the transfer of energy from high band gap host to the low band gap dopant is very important for designing an efficient and stable white LED system. Novel geometric isomers of thienylene vinylene are studied here for resonant energy transfer between the components of the blends. In this study we report a novel methodology for a simple and pictorial depiction of resonant energy transfer between conjugated polymers in blend for a quick screening of prospective constituents prior to synthesis of these polymeric materials. The resonant energy transfer is also supported by the experimental observations which show a spectral overlap. The sequence of energy transfer predicted by theory is in agreement with the order of band gap of the constituent polymers. The resulting fluorescence spectrum of the blends gave a broad emission in the visible region and is of great significance in the development of white light emission.