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Solution-processed transparent blue organic light-emitting diodes with graphene as the top cathode.

Chang JH, Lin WH, Wang PC, Taur JI, Ku TA, Chen WT, Yan SJ, Wu CI - Sci Rep (2015)

Bottom Line: However, reliable methods to fabricate n-doped graphene cathodes have been lacking, which would limit the application of graphene in flexible electronics.The work function and sheet resistance of graphene are modified by an aqueous process which can also transfer graphene on organic devices as the top electrodes.With n-doped graphene layers used as the top cathode, all-solution processed transparent OLEDs can be fabricated without any vacuum process.

View Article: PubMed Central - PubMed

Affiliation: Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, Taiwan 106, R.O.C.

ABSTRACT
Graphene thin films have great potential to function as transparent electrodes in organic electronic devices, due to their excellent conductivity and high transparency. Recently, organic light-emitting diodes (OLEDs)have been successfully demonstrated to possess high luminous efficiencies with p-doped graphene anodes. However, reliable methods to fabricate n-doped graphene cathodes have been lacking, which would limit the application of graphene in flexible electronics. In this paper, we demonstrate fully solution-processed OLEDs with n-type doped multilayer graphene as the top electrode. The work function and sheet resistance of graphene are modified by an aqueous process which can also transfer graphene on organic devices as the top electrodes. With n-doped graphene layers used as the top cathode, all-solution processed transparent OLEDs can be fabricated without any vacuum process.

No MeSH data available.


Related in: MedlinePlus

The transmittance of glass/ITO, glass/ITO/four organic layers, and glass/ITO/four organic layers/4-layer graphene:CsF.
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f3: The transmittance of glass/ITO, glass/ITO/four organic layers, and glass/ITO/four organic layers/4-layer graphene:CsF.

Mentions: After demonstration of the capacity of n-type doped graphene as a cathode, the CsF-doped multilayer graphene films are used as the top cathode in solution-processed multilayer OLEDs. To begin with, the transmittance of the device is investigated. As shown in Fig. 3, the transmittance of ITO/glass is about 90% in the region of visible light. After the deposition of organic layers, including 1,4,5,8,9,11-hexaazatriphenylene hexacarbonitrile (HAT-CN), thermally polymerized 2,7-disubstituted fluorene-based triaryldiamine (VB-FNPD), an emitting layer, and poly[(9,9-bis(30-(N,N-dimethylamino)propyl)-2,7-fluorene)alt-2,7-(9,9-dioctylfluorene)] (PFN), the transmittance is around 90%, which is almost no reduction from the ITO/glass substrate. Although there is an obvious drop of transmittance after the deposition of multilayer graphene on top of the organic layers, the transmittance remains around 75% in the region of visible light.


Solution-processed transparent blue organic light-emitting diodes with graphene as the top cathode.

Chang JH, Lin WH, Wang PC, Taur JI, Ku TA, Chen WT, Yan SJ, Wu CI - Sci Rep (2015)

The transmittance of glass/ITO, glass/ITO/four organic layers, and glass/ITO/four organic layers/4-layer graphene:CsF.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4402614&req=5

f3: The transmittance of glass/ITO, glass/ITO/four organic layers, and glass/ITO/four organic layers/4-layer graphene:CsF.
Mentions: After demonstration of the capacity of n-type doped graphene as a cathode, the CsF-doped multilayer graphene films are used as the top cathode in solution-processed multilayer OLEDs. To begin with, the transmittance of the device is investigated. As shown in Fig. 3, the transmittance of ITO/glass is about 90% in the region of visible light. After the deposition of organic layers, including 1,4,5,8,9,11-hexaazatriphenylene hexacarbonitrile (HAT-CN), thermally polymerized 2,7-disubstituted fluorene-based triaryldiamine (VB-FNPD), an emitting layer, and poly[(9,9-bis(30-(N,N-dimethylamino)propyl)-2,7-fluorene)alt-2,7-(9,9-dioctylfluorene)] (PFN), the transmittance is around 90%, which is almost no reduction from the ITO/glass substrate. Although there is an obvious drop of transmittance after the deposition of multilayer graphene on top of the organic layers, the transmittance remains around 75% in the region of visible light.

Bottom Line: However, reliable methods to fabricate n-doped graphene cathodes have been lacking, which would limit the application of graphene in flexible electronics.The work function and sheet resistance of graphene are modified by an aqueous process which can also transfer graphene on organic devices as the top electrodes.With n-doped graphene layers used as the top cathode, all-solution processed transparent OLEDs can be fabricated without any vacuum process.

View Article: PubMed Central - PubMed

Affiliation: Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, Taiwan 106, R.O.C.

ABSTRACT
Graphene thin films have great potential to function as transparent electrodes in organic electronic devices, due to their excellent conductivity and high transparency. Recently, organic light-emitting diodes (OLEDs)have been successfully demonstrated to possess high luminous efficiencies with p-doped graphene anodes. However, reliable methods to fabricate n-doped graphene cathodes have been lacking, which would limit the application of graphene in flexible electronics. In this paper, we demonstrate fully solution-processed OLEDs with n-type doped multilayer graphene as the top electrode. The work function and sheet resistance of graphene are modified by an aqueous process which can also transfer graphene on organic devices as the top electrodes. With n-doped graphene layers used as the top cathode, all-solution processed transparent OLEDs can be fabricated without any vacuum process.

No MeSH data available.


Related in: MedlinePlus