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1、Silsesquioxane-BasedNanocompositeTHEDendrimersWithPhoto-luminescentCHEMICALRECORDandChargeTransportProperties1221MEEYOONLO,KAZUNORIUENO,HIROSHITANABE,ALANSELLINGER1InstituteofMaterialsResearchandEngineering(IMRE),3ResearchLink,117602,Singapore2CanonInc.,30-2,Shimomaruko3-Chome,Ohta-ku,To
2、kyo146-8501,JapanReceived31January2006;Revised27March2006;Accepted15April2006ABSTRACT:Thesynthesisandcharacterizationofoctavinylsilsesquioxane(OVS)-basednanocom-positedendrimerswithluminescentandchargetransportpropertiesarereported.Thenanocom-positedendrimerswerepreparedinhighyieldusingm
3、ildHeckchemistryofmono-haloaromaticcompoundswiththeperipheralvinylsilanegroupsofOVS.Attachmentof2-naphthalene,2-(9,9-dimethyl)fluorene,and2-(4-phenyl)-5-(1-naphthyl)-1,3,4-oxadiazoleresultedinmaterialswithblue-violetemission(360–380nm)andphoto-luminescentquantumefficiencies(PLQEs)from1to26
4、%.1Blue-greenemissionwasobservedforattachmentof1-pyrene,9-anthracene,andN-(4-phenyl)-144N,N,N-triphenylbenzene-1,4-diaminewithPLQEsrangingfrom23to50%.Despitetheplanarcharacteristicsoftheorganicdendrons,thenanocompositedendrimersarecompletelyamorphousandhavehighglasstransitiontemperatures
5、(Tg)rangingfrom115to186°Cwithdecompositiontemperatures(Td)exceeding450°C.Matrix-assistedlaserdesorptionionization–timeofflightshowsthatunliketraditionalHeckchemistry,haloaromaticcompoundsareaddingtwiceacrossthevinyl-silanegroups.Finally,organiclightemittingdiodesusingthearomaticamine-base
6、ddendrimerasholeinjectionlayersshow55%improvementindeviceefficiencyovertraditionalmaterials(5.16vs.−1−23.24cdA)withbrightnesslevelsexceeding40,000cdm.©2006TheJapanChemicalJournalForumandWileyPeriodicals,Inc.ChemRec6:157–168;2006:PublishedonlineinWileyInter-Science(www.interscience.wiley.c
7、om)DOI10.1002/tcr.20080Keywords:Heck;vinylsilane;silsesquioxane;photo-luminescent;OLEDIntroductionHavingadiagonaldiameterof0.53nm,cubicsilsesquioxanesveryfewreactiveocta-functionalSSQscanbepurchased.14Of(SSQs),(RSiO1.5)8,canbeconsideredthesmallestparticleofthesereactiveoc
