Blue Emitting Polymers as Host Materials of Phosphorescent Dopant and Their Electroluminescent Properties

Abstract

ABSTRACT Two types of blue electroluminescent conjugated polymers, poly(BP-alt-BCV) and poly(BFMP12-BPV), were prepared by Horner-Emmons polycondensation and used as host polymers for the phosphorescent dopant, (bsn)2Ir(acac). Poly(N-vinylcarbazole) (PVK), known as a blue emitting material, was also used for comparison with these polymers. Electrophosphorescence of PLEDs with these dopant/host systems was investigated in terms of luminescence, efficiency, emission color, and energy transfer. The poly(BP-alt-BCV) showed blue emission of high color purity (x = 0.18, y = 0.19), however, poly(BP-alt-BCV) host/phosphorescent (bsn)2Ir(acac) dopant showed red emission (x = 0.60, y = 0.37) due to an efficient energy transfer from poly(BP-alt-BCV) host polymer to phosphorescent (bsn)2Ir(acac) dopant.