Investigating morphology and stability of Fac-tris (2-phenylpyridyl)iridium(III) films for OLEDs

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dc.contributor.authorSmith, ARGen_AU
dc.contributor.authorRuggles, JLen_AU
dc.contributor.authorCavaye, Hen_AU
dc.contributor.authorShaw, PEen_AU
dc.contributor.authorDarwish, TAen_AU
dc.contributor.authorJames, Men_AU
dc.contributor.authorGentle, IRen_AU
dc.contributor.authorBurn, PLen_AU
dc.date.accessioned2012-02-09T02:17:56Zen_AU
dc.date.available2012-02-09T02:17:56Zen_AU
dc.date.issued2011-06-21en_AU
dc.date.statistics2012-02-09en_AU
dc.description.abstractStable film morphology is critical for long-term high performance organic light-emitting diodes (OLEDs). Neutron reflectometry (NR) is used to study the out-of-plane structure of blended thin films and multilayer structures comprising evaporated small molecules. It is found that as-prepared blended films of fac-tris(2-phenylpyridyl)iridium(III) [Ir(ppy)(3)] in 4,4'-bis(N-carbazolyl) biphenyl (CBP) are uniformly mixed, but the occurrence of phase separation upon thermal annealing is dependent on the blend ratio. Films comprised of the ratio of 6 wt% of Ir(ppy)(3) in CBP typically used in OLEDs are found to phase separate with moderate heating while a higher weight percent mixture (12 wt%) is found to be stable. Furthermore, it is found that thermal annealing of a multilayer film comprised of typical layers found in efficient devices ([tris(4-carbazoyl-9-ylphenyl)amine (TCTA)/Ir(ppy)(3):CBP/bathocuproine (BCP)]) causes the BCP layer to become mixed with the emissive blend layer, whereas the TCTA interface remains unchanged. This significant structural change causes no appreciable difference in the photo luminescence of the stack although such a change would have a dramatic effect on the charge transport through the device, leading to changes in performance. These results demonstrate the effect of thermal stress on the delicate interplay between the chemical composition and morphology of OLED films. © 2011, Wiley-Blackwell.en_AU
dc.identifier.citationSmith, A. R. G., Ruggles, J. L., Cavaye, H., Shaw, P. E., Darwish, T. A., James, M., Gentle, I. R., Burn, P. L. (2011). Investigating morphology and stability of Fac-tris (2-phenylpyridyl)iridium(III) films for OLEDs. Advanced Functional Materials, 21(12), 2225-2231. doi:10.1002/adfm.201002365en_AU
dc.identifier.govdoc3837en_AU
dc.identifier.issn1616-301Xen_AU
dc.identifier.issue12en_AU
dc.identifier.journaltitleAdvanced Functional Materialsen_AU
dc.identifier.pagination2225-2231en_AU
dc.identifier.urihttp://dx.doi.org/10.1002/adfm.201002365en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/4001en_AU
dc.identifier.volume21en_AU
dc.language.isoenen_AU
dc.publisherWiley-Blackwell Publishingen_AU
dc.subjectThin filmsen_AU
dc.subjectMorphologyen_AU
dc.subjectSemiconductor diodesen_AU
dc.subjectPolymersen_AU
dc.subjectStabilityen_AU
dc.subjectEfficiencyen_AU
dc.titleInvestigating morphology and stability of Fac-tris (2-phenylpyridyl)iridium(III) films for OLEDsen_AU
dc.typeJournal Articleen_AU
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