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Article: Synthesis, photophysical and electrophosphorescent properties of fluorene-based platinum(II) complexes

TitleSynthesis, photophysical and electrophosphorescent properties of fluorene-based platinum(II) complexes
Authors
Keywordscharge transfer
cyclometalation
electrophosphorescence
fluorenes
organic light-emitting diodes
platinum
Issue Date2010
PublisherWiley - V C H Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.wiley-vch.de/home/chemistry
Citation
Chemistry - A European Journal, 2010, v. 16 n. 47, p. 14131-14141 How to Cite?
AbstractA series of platinum(II) complexes bearing tridentate cyclometalated C^N^N (C^N^N=6-phenyl-2,2'-bipyridine and π-extended R-C^N^N=3-[6'-(naphthalen-2''- yl)pyridin-2'-yl]isoquinoline) ligands with fluorene units have been synthesised and their photophysical properties have been studied. The fluorene units are incorporated into the cyclometalated ligands by a Suzuki coupling reaction. An increase in the π-conjugation of the cyclometalated ligands confers favourable photophysical properties compared to the 6-phenyl-2,2'-bipyridine analogues. The fluorene-based platinum(II) complexes display vibronic-structured emission bands with Î max=558-601 nm, and high emission quantum yields up to 0.76 in degassed dichloromethane. Their emissions are tentatively assigned to excited states with mixed 3IL/ 3MLCT parentage (IL=intraligand, MLCT=metal-to-ligand charge transfer). The crystal structures of these platinum(II) complexes reveal extensive Pt II•••π and/or π-π interactions. The fluorene-based platinum(II) complexes are soluble in organic solvents, have high thermal stability with decomposition temperature >350 °C, and can be thermally vacuum-sublimed or solution-processed as phosphorescent dopants for the fabrication of organic light-emitting diodes (OLEDs). A monochromic OLED with 3 d as dopant (2 wt %) fabricated by vacuum deposition gave a current efficiency of 14.7 cd A -1 and maximum brightness of 27000 cd m -2. A high current efficiency (9.2 cd A -1) has been achieved in a solution-processed OLED using complex 3 f (5 wt %) doped in a PVK (poly(9-vinylcarbazole)) host. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Persistent Identifierhttp://hdl.handle.net/10722/134381
ISSN
2015 Impact Factor: 5.771
2015 SCImago Journal Rankings: 2.323
ISI Accession Number ID
Funding AgencyGrant Number
Innovation and Technology Commission of the HKSAR GovernmentITF/016/08NP
University Grants Committee of the Hong Kong SARAoE/P-03/08
Research Grants Council of Hong Kong SARHKU 7008/09P
National Natural Science Foundation of China/Research Grants CouncilN HKU 752/08
Chinese Academy of Sciences: Croucher Foundation
University of Hong Kong200807176030
Funding Information:

We gratefully acknowledge financial support from the Innovation and Technology Commission of the HKSAR Government (ITF/016/08NP), the University Grants Committee of the Hong Kong SAR (AoE/P-03/08), the Research Grants Council of Hong Kong SAR (HKU 7008/09P), the National Natural Science Foundation of China/Research Grants Council Joint Research Scheme (N HKU 752/08) and the Chinese Academy of Sciences: Croucher Foundation Funding Scheme For Joint Laboratories. Dr. S. C. F. Kui acknowledges the small project funding (200807176030) and the postdoctoral fellow scholarship from The University of Hong Kong. Dr. M.-Y. Yuen acknowledges the postgraduate studentship from The University of Hong Kong.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorYuen, MYen_HK
dc.contributor.authorKui, SCFen_HK
dc.contributor.authorLow, KHen_HK
dc.contributor.authorKwok, CCen_HK
dc.contributor.authorChui, SSYen_HK
dc.contributor.authorMa, CWen_HK
dc.contributor.authorZhu, Nen_HK
dc.contributor.authorChe, CMen_HK
dc.date.accessioned2011-06-17T09:18:49Z-
dc.date.available2011-06-17T09:18:49Z-
dc.date.issued2010en_HK
dc.identifier.citationChemistry - A European Journal, 2010, v. 16 n. 47, p. 14131-14141en_HK
dc.identifier.issn0947-6539en_HK
dc.identifier.urihttp://hdl.handle.net/10722/134381-
dc.description.abstractA series of platinum(II) complexes bearing tridentate cyclometalated C^N^N (C^N^N=6-phenyl-2,2'-bipyridine and π-extended R-C^N^N=3-[6'-(naphthalen-2''- yl)pyridin-2'-yl]isoquinoline) ligands with fluorene units have been synthesised and their photophysical properties have been studied. The fluorene units are incorporated into the cyclometalated ligands by a Suzuki coupling reaction. An increase in the π-conjugation of the cyclometalated ligands confers favourable photophysical properties compared to the 6-phenyl-2,2'-bipyridine analogues. The fluorene-based platinum(II) complexes display vibronic-structured emission bands with Î max=558-601 nm, and high emission quantum yields up to 0.76 in degassed dichloromethane. Their emissions are tentatively assigned to excited states with mixed 3IL/ 3MLCT parentage (IL=intraligand, MLCT=metal-to-ligand charge transfer). The crystal structures of these platinum(II) complexes reveal extensive Pt II•••π and/or π-π interactions. The fluorene-based platinum(II) complexes are soluble in organic solvents, have high thermal stability with decomposition temperature >350 °C, and can be thermally vacuum-sublimed or solution-processed as phosphorescent dopants for the fabrication of organic light-emitting diodes (OLEDs). A monochromic OLED with 3 d as dopant (2 wt %) fabricated by vacuum deposition gave a current efficiency of 14.7 cd A -1 and maximum brightness of 27000 cd m -2. A high current efficiency (9.2 cd A -1) has been achieved in a solution-processed OLED using complex 3 f (5 wt %) doped in a PVK (poly(9-vinylcarbazole)) host. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.en_HK
dc.languageengen_US
dc.publisherWiley - V C H Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.wiley-vch.de/home/chemistryen_HK
dc.relation.ispartofChemistry - A European Journalen_HK
dc.rightsPreprint This is the pre-peer reviewed version of the following article: Chemistry - A European Journal, 2010, v. 16 n. 47, p. 14131-14141, which has been published in final form at [Link to final article].-
dc.subjectcharge transferen_HK
dc.subjectcyclometalationen_HK
dc.subjectelectrophosphorescenceen_HK
dc.subjectfluorenesen_HK
dc.subjectorganic light-emitting diodesen_HK
dc.subjectplatinumen_HK
dc.titleSynthesis, photophysical and electrophosphorescent properties of fluorene-based platinum(II) complexesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0947-6539&volume=16&issue=47&spage=14131&epage=14141&date=2010&atitle=Synthesis,+photophysical+and+electrophosphorescent+properties+of+fluorene-based+platinum(II)+complexes-
dc.identifier.emailKui, SCF: stevenku@hku.hken_HK
dc.identifier.emailKwok, CC: cckwok@hku.hken_HK
dc.identifier.emailChui, SSY: chuissy@hkucc.hku.hken_HK
dc.identifier.emailZhu, N: nzhu@hkucc.hku.hken_HK
dc.identifier.emailChe, CM: cmche@hku.hken_HK
dc.identifier.authorityKui, SCF=rp00715en_HK
dc.identifier.authorityKwok, CC=rp00847en_HK
dc.identifier.authorityChui, SSY=rp00686en_HK
dc.identifier.authorityZhu, N=rp00845en_HK
dc.identifier.authorityChe, CM=rp00670en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/chem.201001570en_HK
dc.identifier.pmid20960442-
dc.identifier.scopuseid_2-s2.0-78650271836en_HK
dc.identifier.hkuros185041en_US
dc.identifier.hkuros233334-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78650271836&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume16en_HK
dc.identifier.issue47en_HK
dc.identifier.spage14131en_HK
dc.identifier.epage14141en_HK
dc.identifier.isiWOS:000286289700031-
dc.publisher.placeGermanyen_HK
dc.relation.projectInstitute of Molecular Functional Materials-
dc.identifier.scopusauthoridYuen, MY=25931928700en_HK
dc.identifier.scopusauthoridKui, SCF=6506763660en_HK
dc.identifier.scopusauthoridLow, KH=7102180516en_HK
dc.identifier.scopusauthoridKwok, CC=7102029161en_HK
dc.identifier.scopusauthoridChui, SSY=8297453100en_HK
dc.identifier.scopusauthoridMa, CW=55242837000en_HK
dc.identifier.scopusauthoridZhu, N=7201449530en_HK
dc.identifier.scopusauthoridChe, CM=7102442791en_HK

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