Bright red-emitting electrophosphorescent device using osmium complex as a triplet emitter

Autor:	Rajasekhar Dodda, Michelle S. Liu, Brenden Carlson, Joo Hyun Kim, Larry R. Dalton, Ching-Fong Shu, Alex K.-Y. Jen
Rok vydání:	2003
Předmět:	Materials science Physics and Astronomy (miscellaneous) Dopant Oxadiazole chemistry.chemical_element Triphenylamine Photochemistry Indium tin oxide Polyfluorene chemistry.chemical_compound chemistry Side chain Quantum efficiency Osmium
Zdroj:	Applied Physics Letters. 83:776-778
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.1593230
Popis:	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/OsCF3:PF–TPA–OXD/Ca/Ag) reaches a maximum external quantum efficiency of 2.1% with a peak brightness of 2920 cd/m2. These results are significantly higher than those obtained from the commonly used host, PVK:PBD (0.49% and 1270 cd/m2).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::feca5c78b92c3e7c5b30e4b601fd845f https://doi.org/10.1063/1.1593230 Zobrazit plný text záznamu