Electroluminescent properties of a derivative of quinquepyridine

Electroluminescent (EL) properties of 6,6-dimethyl-4^′,4 ^‴-diphenyl-2,2^′:6^′,2 ^″:6^″,2^‴:6 ^‴,2-quinquepyridine (DMDPQPY) have been examined. The EL results of typical single layer devices indicate that emitting layer thickness can influence the emission wavelength. The introduction of a hole transporting layer in the double layer device enhances the luminance greatly, showing a better charge balance. It is proposed that 2,6-linked poly(oligo) pyridine derivatives are promising to form a new class of EL material both as emitter and as carrier transporter.