Enhanced Hole Injection in a Hybrid Organic–Inorganic Light-Emitting Diode

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概要

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• The operating mechanism, particularly the carrier injection mechanism, of a hybrid organic–inorganic light-emitting diode (HOILED) is reported. Asymmetric hole injection has been observed in a symmetric hole-only device, which has two identical interfaces between a conducting polymer and a metal oxide. A HOILED having a layer of molybdenum oxide (MoO3) deposited on a layer of poly(dioctylfluorene-alt-benzothiadiazole) (F8BT) demonstrated a markedly enhanced hole injection, four orders of magnitude higher on one side of the structure than on the other side. This enhanced hole injection is considered to initiate the operation of the HOILED. X-ray photoelectron spectra (XPS) analysis revealed that Mo deposited on the surface of F8BT was reduced compared to that deposited Mo below the film of F8BT. It is suggested that a chemical interaction between the metal oxide and the organic material affects carrier injection.

• 2008-09-25

著者

• Ishida Masaya

  Cambridge Research Laboratory of Epson, Epson U.K. Ltd., Cambridge CB4 0FE, United Kingdom

• Morii Katsuyuki

  Seiko Epson Corporation, 281 Fujimi, Nagano 399-0293, Japan

• Omoto Masayuki

  Seiko Epson Corporation, 281 Fujimi, Nagano 399-0293, Japan

• Graetzel Michael

  Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Swiss Federal Institute of Technology, Lausanne CH-1015, Switzerland

関連論文

• Enhanced Hole Injection in a Hybrid Organic–Inorganic Light-Emitting Diode
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