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1、www.advmat.dewww.MaterialsViews.comCOMMUNICATIONBroadbandLightExtractionfromWhiteOrganicLight-EmittingDevicesbyEmployingCorrugatedMetallicElectrodeswithDualPeriodicityYan-GangBi,JingFeng,*Yun-FeiLi,Xu-LinZhang,Yue-FengLiu,YuJin,andHong-BoSun*Whiteorganiclight-emittingdiodes(WOLEDs)
2、areofinteresttoreplaceITOastheanodecouldeliminatethepowerlosttoonthegroundsoftheirpotentialapplicationsforfull-colorßat-theWGmodesinITO.[3,12]Inthiscase,lighttrappedinthepaneldisplaysandsolid-statelighting.[1,2]HighefÞciencyisaSPPmodeswouldrepresentthemainpowerlost,andthere-keyissu
3、efortheircommercialapplications,whileaverylowfore,highlyefÞcientlightextractioncouldbeexpectedbylightextractionefÞciencyoflessthan20%isastumblingblockbroadbandexcitationandoutcouplingoftheSPPmodesinforthishighefÞciency.Morethan80%photonsproducedbytheWOLEDs.Recently,theuseofdualplas
4、monicnanostruc-excitondecayaretrappedinsideOLEDsintheformofwave-tureswithAunanoparticlesembeddedinaperiodiccorrugatedguide(WG)modesinorganic/indiumÐtinoxide(ITO)anodeactivepolymerlayerbynanoimprintinghasbeenreportedtolayers,surfaceplasmonÐpolariton(SPP)modesassociatedwithachievebro
5、adbandlightabsorptioninorganicsolarcells,[13]themetallicelectrode/organicinterface,andsubstratemodeswhichmightprovideapossibilitytoexcitebroadbandSPPfromtotalinternalreßectionattheglasssubstrate/airinter-modesforWOLEDs.However,nanoimprintingisusuallyappli-face.[3Ð5]Thesetrappedphot
6、onsrepresenttheareainwhichcabletopolymerÞlmsandhaslimitationsinsmall-molecule-thereisstillthegreatestscopeforsigniÞcantimprovementsinbaseddevices.Herein,broadbandexcitationandoutcouplingofefÞciencythroughanefÞcientrecoveryofthelostpower.Broad-theSPPmodesinWOLEDshasbeenrealizedbyint
7、roducingbandextractionisimportantfortheefÞcientoutcouplingofatwo-dimensional(2D)gratingwithdual-periodiccorruga-thetrappedphotons,especiallyforthosetrappedinWOLEDstionintotheWOLEDs.The2Dgratingconsistsoftwosetswhosespectracoversthewholevisiblewavelength.Broadbandofcorrugationswithd
8、ifferentperiodsthatcanbroa
