Ion dissociation in crown ether based wide band gap LECs

We report the electrical characteristics of light emitting electrochemical cells (LECs) consisting of a wide band gap light emitting polymer, mLPPP, ( methyl substituted ladder type poly(paraphenylene)) and Li-triflate based s olid state electrolytes using either PEO (poly(ethylene oxide)) or a crown ether as ion-coordinating and transporting compounds. The crown ether based devices show an improved performance. This behavior is discussed by compar ing the infrared spectra of the PEO and the crown ether based blends, that, going along with Cram's principle of preorganization, show a much higher i on dissociation in the case of the crown ether blends.