Hirohiko Fukagawa

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The hole–phonon coupling of a rubrene monolayer on graphite is measured by means of angle resolved ultraviolet photoelectron spectroscopy. Thus, the charge reorganization energy λ and the small polaron binding energy is determined, which allows insight into the nature of charge transport in condensed rubrene.
Organic light-emitting diodes (OLEDs) have been intensively studied as a key technology for next-generation displays and lighting. The efficiency of OLEDs has improved markedly in the last 15 years by employing phosphorescent emitters. However, there are two main issues in the practical application of phosphorescent OLEDs (PHOLEDs): the relatively short(More)
This paper describes our recent progress in the development of oxide thin-film transistors (TFTs) for use in flexible organic light-emitting diode (OLED) displays. The bending stability of oxide TFTs was investigated using In-Ga-Zn-O (IGZO) TFTs fabricated on a thin polyimide film. Back-channel-etched (BCE) TFTs on a plastic film using In-Sn-Zn-O (ITZO),(More)
Organic light-emitting diodes are a key technology for next-generation information displays because of their low power consumption and potentially long operational lifetimes. Although devices with internal quantum efficiencies of approximately 100% have been achieved using phosphorescent or thermally activated delayed fluorescent emitters, a systematic(More)
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