Bright red-emitting electrophosphorescent device using osmium complex as a triplet emitter
- 28 July 2003
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 83 (4), 776-778
- https://doi.org/10.1063/1.1593230
Abstract
A series of efficient and bright double-layer light-emitting devices have been fabricated using the osmium (Os) complex as the triplet emissive dopant in both a blue-emitting polyfluorene derivative (PF–TPA–OXD) containing hole-transporting triphenylamine (TPA) and electron-transporting oxadiazole (OXD) as side chains and a blend of 2-(4-t-butylphenyl)-5(4-biphenylyl)-1,3,4-oxadizole (PBD) in poly(N-vinylcarbazole) (PVK). Due to a balanced charge injection and transport in PF–TPA–OXD and very efficient energy transfer from this polymer to the Os complex, the resulting device (indium tin oxide/HTL/OsCF 3 : PF–TPA–OXD/Ca/Ag) reaches a maximum external quantum efficiency of 2.1% with a peak brightness of 2920 cd/m 2 . These results are significantly higher than those obtained from the commonly used host, PVK:PBD (0.49% and 1270 cd/m 2 ).Keywords
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