Current-Induced Spectrum Change of Phosphorescent Organic Light-Emitting Diode Constructed with Vinyl Compounds

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概要

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• Organic light-emitting diodes were prepared by coevaporating 4,4$'$-N,N$'$-dicarbazolylbiphenyl (CBP) host material, tris(2-phenylpyridinate) iridium(III) [Ir(ppy)3] dopant material, and their vinyl derivatives for the emissive layer. It was found that the emission spectrum changes with time during device operation when both the host and the dopant molecules have vinyl groups. This spectral change corresponded to the transition of emission from vinyl-modified Ir(ppy)3 to nonmodified Ir(ppy)3. The spectral transition was more prominent when an acrylate derivative was used in place of a vinyl derivative of CBP. A similar change in luminescence spectrum was observed when the film was polymerized by thermal annealing or electron-assisted deposition. It is speculated that the spectral transition is caused by the copolymerization of host and dopant molecules during device operation. Such a current-induced polymerization can be a novel and convenient method of preparing polymeric thin films by the physical vapor deposition of functional monomers.

• 2008-02-25

著者

• Usui Hiroaki

  Tokyo Institute Of Technology Department Of Textile And Polymeric Materials

• KAWAKAMI Akira

  Tokyo University of Agriculture and Technology, Department of Organic and Polymer Materials Chemistr

• Bekku Hiroshi

  Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan

• Taka Hideo

  Konica Minolta Technology Center, Inc., Hino, Tokyo 191-8511, Japan

• Otsuki Eiji

  Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan

• Kita Hiroshi

  Konica Minolta Technology Center, Inc., Hino, Tokyo 191-8511, Japan

• Sato Hisaya

  Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan

• Wada Rihito

  Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan

関連論文

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• Polymeric Film Deposition by Coevaporation of Polymerizable Monomer and Initiator
• Selective Patterning of Organic Light-Emitting Diodes by Physical Vapor Deposition of Photosensitive Materials
• Determination of the Frank Elastic Constant Ratios in MBBA by Observing the Angular Dependence of Rayleigh Scattering
• Vapor Deposition Polymerization of Polyimide Having Perylene Unit and its Characterization by Displacement Current Measurement
• Electrospray Deposition of PEDOT-PSS and Electrochemical Characterization
• Current-Induced Spectrum Change of Phosphorescent Organic Light-Emitting Diode Constructed with Vinyl Compounds
• Phosphorescent Organic Light Emitting Diode Using Vinyl Derivatives of Hole Transport and Dopant Materials
• Interface Control by Surface-Initiated Deposition Polymerization and Its Application to Organic Light-Emitting Devices

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