Abstract
Electrophosphorescence and the dynamics of charge carrier recombination in poly(9-vinylcarbazole) (PVK)/tris(2-phenylpyridine)iridium [Ir-(ppy)3] bilayer electroluminescence devices were investigated. Because the second layer [Ir-(ppy)3] is spin cast from a solvent that slightly swells the PVK layer, the two layers are partially intermixed at the bilayer interface. Indium tin oxide (ITO)/3,4-polyethylenedioxythiophene-polystyrenesulfonate (PEDOT)∕[PVK∕Ir(ppy)3] bilayer/2,9-dimethyl-4,7-diphenyl-1, 10-phenanthroline (BCP)∕Ca∕Al ultilayer devices showed similar emission intensity and color quality to those of the PVK:Ir(ppy)3 blended device. However, turn-on and driving voltage were decreased dramatically compared with those of the ITO∕PEDOT∕PVK:Ir(ppy)3 blend∕BCP∕Ca∕Al.
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