平板显示技术_C5 OLEDppt课件.ppt

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1、平板显示技术FlatPanelDisplayTechnology主动发光主动发光功耗小轻、薄PanasonicMatsushita（37-inchOLEDTVs）可弯曲SamsungDemosWorld'sFirstBendableOLEDScreenFlexibleAMOLEDDisplaybyITRI主要内容1有机半导体基础2OLED原理3OLED器件设计4OLED显示面板的设计5OLED驱动原理6OLED制作7OLED衰减机理8未来发展方向OLEDvsLCD1有机半导体基础TransportinorganicsinglecrystalsSinglecrystalsHolstein

2、modelKenkreModelSilinshandCapekmodelNorbertKarl’sdata(1980’s)HendrikSchon’sdata(1999-2001)*Refs:J.H.Schonetal.Phys.Rev.B63,Art245201(2001)Ch.7;SilinshandCapekOrganicsemiconductorsMolecularorbitalsBondsandBandsHydrocarbonsOrbitalDescriptionofprobableelectrondensitynearanucleussOrbitalLowestenergy

3、orbital,sphericalinshapepOrbitalDumbbellshapedHybridizationMixingoforbitalsFillingoforbitalsEachmolecularorbitalcanhaveamax.of2electronsPauliprinciple(2electronsmusthaveoppositespin)Aufbauprinciple–ElectronsalwaysoccupyorbitalsoflowestenergyfirstCarbon6Electrons1s22s22p2Onepossibility:Hybridizat

4、ion(mixingoforbitals)3xsp2orbitals+1pzorbitalPzPolyacenes:Numberofpelectrons:4n+2pelectronoverlapbetweenadjacentcarbonatoms:leadstodelocalizationWithinasinglemoleculethereisverygoodelectronicoverlapBondingCovalent(Si)Electronsharing–2ormoreelectronssharedby2ormoreatomsIonic(GaAs)Electrontransfer

5、VanderWaals(Bondingbetweencovalentmolecules)Londonforces(attractionbetweenmoleculeswithnopermanentdipolemoment)Dipolarattraction(polarmolecules)Hydrogenbonding(covalentlyboundhydrogen+negativedipole)MolecularOrbitalsHuckelMOTheory(Isolatedmolecule)Withoverlap2electronsperorbitalEnergygapPentacen

6、eSSSSSSa-6TSSSSa-4TTetraceneC60Materialsp-conjugatedMolecules(oligomers)Transportp-p*overlapCrystalStructure-AnisotropyHerringbone-Structurevan-der-Waals(attraction)Pauli-Principle(repulsion)LayeredSemiconductorAnisotropyThiophenesAcenesspar/sper~70~3spar1/spar2~1.5~1.5TetraceneBandstructureofa

7、-sexithiophene(a-6T)Anisotropy(Pentacene)3DBandTransportHighT(~400K):CrossovertoHoppingEffective,ElectronicBandwidthMassRenormalization/ShrinkingofBandwidthBandwidth,MeanFreePath,andBandwidthPentaceneSelf-ConsistentDescripti