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Spin-assembled nanolayer of a hyperbranched polymer on the anode in organic light-emitting diodes: The mechanism of hole injection and electron blocking

Cited 22 time in Web of Science Cited 13 time in Scopus
Authors

Lee, Tae-Woo; Park, Jong-Jin; Kwon, Young; Hayakawa, Teruaki; Choi, Tae-Lim; Park, Jong Hyeok; Das, Rupasree Ragini; Kakimoto, Masa-aki

Issue Date
2008-11
Publisher
American Chemical Society
Citation
Langmuir, Vol.24 No.21, pp.12704-12709
Abstract
We introduced a spin-assembled nanolayer of hyperbranched poly(ether sulfone) with sulfonic acid terminal on top of an indium-tin oxide anode in organic light-emitting diodes. This results in great improvement in luminous efficiency, better than that of devices using a commercially available conducting polymer composition as a hole-injection layer. The effect of the nanolayer was investigated by impedance spectroscopy, photovoltaic measurement for built-in-potential, and transient electroluminescence. We concluded that the high luminous efficiency resulted from the efficient electron-blocking by the nanolayer and hole-injection assisted by the accumulation of electrons at the interface. This result implies that, for an efficient hole-injection layer, the electron-blocking capability should be incorporated in addition to the hole-injection and -transport capability.
ISSN
0743-7463
URI
https://hdl.handle.net/10371/189890
DOI
https://doi.org/10.1021/la800985k
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