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Improved hole injection and transport of organic light-emitting devices with an efficient p-doped hole-injection layer
7.G. H. Xie, Y. L. Meng, F. M. Wu, C. Tao, D. D. Zhang, M. J. Liu, Q. Xue, W. Chen, and Y. Zhao, Appl. Phys. Lett. 92, 093305 (2008).
11.D. D. Zhang, J. Feng, Y. F. Liu, Y. Q. Zhong, Y. Bai, Y. Jin, G. H. Xie, Q. Xue, Y. Zhao, S. Y. Liu, and H. B. Sun, Appl. Phys. Lett. 94, 223306 (2009).
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A -tris(3-methylphenylphenylamino)triphenylamine thin film doped with has been demonstrated an efficient p-type hole-injection layer (HIL) in organic light-emitting devices(OLEDs). The tris-(8-hydroxyquinoline) aluminum-based OLEDs with the p-type HIL exhibit a very low turn-on voltage of 2.4 V and a high luminance of at 8 V, while it is 3 V and , respectively, for the nondoped devices. The improvement in the device performance is clarified as arising from the improved hole injection and transport by the results of ultraviolet/visible/near-infrared absorption, x-ray photoelectron spectra and current density-voltage characteristics of hole-only devices.
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