Investigation of Energy Transfer in a Blend of electroluminescent Conducting Polymers

Abstract

Abstract. With the aim of improving the photonic efficiency of an organic light emitting diode a blend of electroluminescent polymers, poly [9-vinylcarbarzole] (PVK) and poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) was prepared. The energy transfer in the blend was investigated through the comparison of absorption, photoluminescence (PL) and currentvoltage (I-V) characteristics of the blend and standard polymers. The obtained results showed that energy transfer from PVK to MEH-PPV enable to form localized excited-state complexes (e.g. exciplexes) in MEH-PPV. The PL intensity of the blended polymers was enhanced as the relative content of MEH-PPV was increased, and particularly, the highest improved PL was observed for an weight fraction of 15 wt% of MEH-PPV in PVK. Organic light emitting diodes made from these blends would exhibit a large photonic efficiency.

Light Absorption and Luminescence Properties of the Blend Poly(N-vinylcarbazole)/Poly(N-hexylthiophene)

“…Other important reasons for the employment of PVK as a host are its favorable film-forming properties, durability at higher temperatures and hole mobility around 10 −5 cm 2 /Vs. In a recent communication we have also discussed the investigation of energy transfer from PVK -based with [2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene] (MEH-PPV) [14]. In this study, the blend conducting polymers of PVK and poly(3-hexylthiophene) (P3HT) was fabricated.…”