Diamond-like carbon films as electron-injection layer in organic light emitting diodes

Lmimouni, K.; Legrand, C.; Dufour, C.; Chapoton, A.; Belouet, C.
April 2001
Applied Physics Letters;4/23/2001, Vol. 78 Issue 17, p2437
Academic Journal
In this letter a thin film of diamond-like carbon (DLC) deposited by pulse laser deposition (PLD) is used as an electron injection layer in organic light emitting diodes. The heterojunction structures of these devices consist of: indium tin oxide (ITO)/conducting polymer/DLC/nickel, or ITO/DLC/P3OT/Pt. Poly(3-octylthiophene) conjugated polymer (P3OT) is used as the emission layer. In all the realized diodes, the current is two orders of magnitude larger than in the conventional ITO/P3OT/aluminum structure, and the driving voltage is drastically reduced. However, the light emission is observed only in the ITO/DLC/P3OT/Pt structure. These results can be interpreted in terms of a highly efficient electron injection from the DLC into the conducting polymer and a DLC/P3OT interface. © 2001 American Institute of Physics.


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