Photoemission study of hole-injection enhancement in organic electroluminescent devices with Au/CF[sub x] anode

Tang, J. X.; Li, Y. Q.; Hung, L. S.; Lee, C. S.
January 2004
Applied Physics Letters;1/5/2004, Vol. 84 Issue 1, p73
Academic Journal
We demonstrate hole-injection enhancement from Au into N,N[sup ′]-bis-(1-naphyl)-N,N[sup ′]diphenyl-1,1[sup ′]-biphenyl-4,4[sup ′]-diamine (NPB) by inserting between them a plasma-polymerized fluorocarbon (CF[sub x]) buffer layer. Ultraviolet and x-ray photoemission spectroscopic study indicates that chemically tailoring the Au surface with CF[sub x] can reduce the hole-injection barrier to ∼1 eV with respect to bare Au. This effect is ascribed to the buildup of an interfacial electric field, arising from the molecular dipolar characteristic of CF[sub x]. The present results suggest that CF[sub x] can function as a hole-injection enhancement layer for organic optoelectronic/electronic devices which use a metallic anode. © 2004 American Institute of Physics.


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