Fullerene-doped hole transport molecular films for organic light-emitting diodes

Yuan, Y.; Grozea, D.; Lu, Z. H.
April 2005
Applied Physics Letters;4/4/2005, Vol. 86 Issue 14, p143509
Academic Journal
C60-doped N,N′-bis(l-naphthyl)-N, N′-diphenyl-1, 1′-biphenyl-4, 4′-diamine(NPB) film is studied as hole injection layer between indium tin oxide (ITO) and NPB. The doped films on ITO substrates were found to be thermally stable after being annealed at temperatures up to 120 °C. This was attributed to a strong interaction between NPB and C60 providing a dipole force crosslinking NPB molecules, similar to a crosslinked thermoset polymer networks. Furthermore, the C60-doped NPB p-type hole injection layers yield devices having better efficiency and low driving voltage as compared with standard devices with CuPc as the hole injection layers.


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