Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.tet.2008.09.033
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dc.titleNovel iridium complexes as high-efficiency yellow and red phosphorescent light emitters for organic light-emitting diodes
dc.contributor.authorYao, J.H.
dc.contributor.authorZhen, C.
dc.contributor.authorLoh, K.P.
dc.contributor.authorChen, Z.-K.
dc.date.accessioned2014-10-16T08:35:25Z
dc.date.available2014-10-16T08:35:25Z
dc.date.issued2008-11-24
dc.identifier.citationYao, J.H., Zhen, C., Loh, K.P., Chen, Z.-K. (2008-11-24). Novel iridium complexes as high-efficiency yellow and red phosphorescent light emitters for organic light-emitting diodes. Tetrahedron 64 (48) : 10814-10820. ScholarBank@NUS Repository. https://doi.org/10.1016/j.tet.2008.09.033
dc.identifier.issn00404020
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/94385
dc.description.abstractA series of novel biscyclometallated iridium complexes based on spirobifluorene ligands and acetyl acetonate (acac) ancillary ligands have been synthesized and characterized. Their electrochemical properties were investigated by cyclic voltammetry (CV). HOMO, LUMO, and energy band gaps of all the complexes were calculated by the combination of UV-vis absorption spectra and CV results. TGA and DSC results indicated their excellent thermal stability and amorphous structure. All the iridium complexes were fabricated into organic light-emitting devices with the device configuration of ITO/PEDOT:PSS (50 nm)/PVK (50 wt %):PBD (40 wt %):Ir complex (10 wt %) (45 nm)/TPBI (40 nm)/LiF (0.5 nm)/Ca (20 nm)/Ag (150 nm). Yellow to red light emission has been achieved from the iridium complexes guest materials. Complex C1 (yellow light emission) achieved an efficiency of 36.4 cd/A (10.1%) at 198 cd/m2 and complex C4 (red light emission) reached external quantum efficiency of 4.6%. The slight decrease of external quantum efficiency at high current density revealed that the triplet-triplet (T1-T1) annihilation was effectively suppressed by the new developed complexes. © 2008 Elsevier Ltd. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.tet.2008.09.033
dc.sourceScopus
dc.subjectIridium complex
dc.subjectOrganic light-emitting diodes (OLEDs)
dc.subjectPhosphorescent materials
dc.subjectSpirobifluorene
dc.typeArticle
dc.contributor.departmentCHEMISTRY
dc.description.doi10.1016/j.tet.2008.09.033
dc.description.sourcetitleTetrahedron
dc.description.volume64
dc.description.issue48
dc.description.page10814-10820
dc.description.codenTETRA
dc.identifier.isiut000260703200006
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