Insertion of an organic interlayer for hole current enhancement in inverted organic light emitting devices

Soon Mi Park; Yoon Hak Kim; Yeonjin Yi; Hyoung-Yun Oh; Jeong Won Kim
August 2010
Applied Physics Letters;8/9/2010, Vol. 97 Issue 6, p063308
Academic Journal
We report the enhancement of hole current density in the hole transport part of an inverted top-emission organic light emitted diode by applying an organic insertion layer of 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile (HAT-CN). Poor hole transporting performance of Al/4,4′-bis(N-phenyl-1-naphthylamino)biphenyl (NPB)/indium tin oxide is greatly improved by the HAT-CN insertion between Al and NPB layer. The highest occupied molecular orbital level onset of the NPB bends toward Fermi level at the HAT-CN/NPB interface. This extra charge generation layer made of pure organic molecules substantially enhances hole injection from Al anode as revealed by the results of ultraviolet photoelectron spectroscopy and J-V measurement data.


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