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Effect of injection layer sub-bandgap states on electron injection in organic light-emitting diodes

It is generally considered that the injection of charges into an active layer of an organic light-emitting diode (OLED) is solely determined by the energetic injection barrier formed at the device interfaces. Here, we demonstrate that the density of surface states of the electron-injecting ZnO layer...

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Hauptverfasser: Hinzmann, Carsten (VerfasserIn) , Hofstetter, Yvonne J. (VerfasserIn) , Hopkinson, Paul E. (VerfasserIn) , Vaynzof, Yana (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: January 18, 2017
In: ACS applied materials & interfaces
Year: 2017, Jahrgang: 9, Heft: 7, Pages: 6220-6227
ISSN:1944-8252
DOI:10.1021/acsami.6b14594
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1021/acsami.6b14594
Verlag, Volltext: https://doi.org/10.1021/acsami.6b14594
Volltext
Verfasserangaben:Carsten Hinzmann, Osnat Magen, Yvonne J. Hofstetter, Paul E. Hopkinson, Nir Tessler, and Yana Vaynzof
Beschreibung
Zusammenfassung:It is generally considered that the injection of charges into an active layer of an organic light-emitting diode (OLED) is solely determined by the energetic injection barrier formed at the device interfaces. Here, we demonstrate that the density of surface states of the electron-injecting ZnO layer has a profound effect on both the charge injection and the overall performance of the OLED device. Introducing a dopant into ZnO reduces both the energy depth and density of surface states without altering the position of the energy levels - thus, the magnitude of the injection barrier formed at the organic/ZnO interface remains unchanged. Changes observed in the density of surface states result in an improved electron injection and enhanced luminescence of the device. We implemented a numerical simulation, modeling the effects of energetics and the density of surface states on the electron injection, demonstrating that both contributions should be considered when choosing the appropriate injection layer.
Beschreibung:Gesehen am 10.07.2018
Beschreibung:Online Resource
ISSN:1944-8252
DOI:10.1021/acsami.6b14594

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