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1、ARTICLEpubs.acs.org/MacromoleculesDendron-JacketedElectrophosphorescentCopolymers:ImprovedEfficiencyandTunableEmissionColorbyPartialEnergyTransferHaoJin,WeiZhang,DanWang,ZengzeChu,ZhihaoShen,*DechunZou,*XingheFan,*andQifengZhouBeijingNationalLaboratoryforMolecularSc
2、iences,KeyLaboratoryofPolymerChemistryandPhysicsofMinistryofEducation,CollegeofChemistryandMolecularEngineering,PekingUniversity,Beijing100871,ChinaABSTRACT:Astyrene-basedphosphorescentmonomerVC3DbmIr(ppy)2withcyclometalatediridiumcomplexwassynthesized.Itwasthencopo
3、lymerizedwiththefirst-generationdendriticcarbazolemonomerVC3CbzG1throughtheconven-tionalfreeradicalpolymerizationtoobtainaseriesofelectro-phosphorescentrandomcopolymers.CharacteristicvibrationalbandsintheFT-IRspectrawereutilizedtodeterminethecom-positionsofthecopolym
4、ers.Theglasstransitiontemperaturesofthecopolymerswereabout90°C,andthe5%weightlosstemperatureswereallabove346°C.Allthecopolymersex-hibitedsimilarabsorbingbandsofthecarbazoleunitsintheUVvisabsorptionspectra.Inthephotoluminescentspectraofthecopolymerfilms,energytransfe
5、rwasfoundfromthecarbazoleunitstoiridiumphosphors.Noobviousenergytransferwasfoundinthecopolymersolutions.Light-emittingdiodeswerefabricatedwithtwoconfigurations.Withincreasingiridiumcontent,theelectroluminescenceofthecopolymersshiftedfrombluetoorangeandpassedthroughan
6、ear-whiteemissionregion.Aftertheoptimizationofthedevicestructure,thedevicecontainingthecopolymerPCbzG1Ir3hadthebestperformancewithamaximum2luminescenceof2441cd/mandamaximumexternalquantumefficiencyof0.520%.’INTRODUCTIONpolymerscanbeprocessedbyspin-coatingorinkjet-prin
7、tingtechniquestorealizetheflexibleandlarge-areadisplays.Mean-Electrophosphorescentmaterialsutilizebothsingletandtri-while,thecovalentbondingbetweenahostpolymerandaguestpletexcitonstoemitlight,andusingthesematerialscangreatlymoleculecanpreventpotentialphaseseparationi
8、nadopingimprovethedeviceefficiencieswitha100%internalquantumef-9ficiencyintheory.1,2Therefore,electrophosphorescentlight-system.Furthermore,b
