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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

Photographs of all-solution blue-light transparent polymer OLEDs.The photographs show the device (a) before and (b) during operation with active size: 2 × 3 mm2. The inset shows the photograph of a working blue-light polymer OLED in front of a mirror, showing emission from both surfaces.
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f5: Photographs of all-solution blue-light transparent polymer OLEDs.The photographs show the device (a) before and (b) during operation with active size: 2 × 3 mm2. The inset shows the photograph of a working blue-light polymer OLED in front of a mirror, showing emission from both surfaces.

Mentions: The electroluminescence (EL) spectra of the blue-light transparent OLEDs on the graphene cathode side are shown in the inset of Fig. 4d, and the maximum emission wavelength of the blue-light OLEDs is 477 nm, which is consistent with reported spectra31. Fig. 5a and 5b present photographs of the transparent blue-light device before and during operation. The inset in Fig. 5b shows a photograph of a working blue-light transparent OLED in front of a mirror, which shows emission from both surfaces. Although the efficiency and brightness of this transparent device may be lower than other reported devices, we demonstrate an approach to realize fully solution-processed transparent OLEDs without vacuum deposition.


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)

Photographs of all-solution blue-light transparent polymer OLEDs.The photographs show the device (a) before and (b) during operation with active size: 2 × 3 mm2. The inset shows the photograph of a working blue-light polymer OLED in front of a mirror, showing emission from both surfaces.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f5: Photographs of all-solution blue-light transparent polymer OLEDs.The photographs show the device (a) before and (b) during operation with active size: 2 × 3 mm2. The inset shows the photograph of a working blue-light polymer OLED in front of a mirror, showing emission from both surfaces.
Mentions: The electroluminescence (EL) spectra of the blue-light transparent OLEDs on the graphene cathode side are shown in the inset of Fig. 4d, and the maximum emission wavelength of the blue-light OLEDs is 477 nm, which is consistent with reported spectra31. Fig. 5a and 5b present photographs of the transparent blue-light device before and during operation. The inset in Fig. 5b shows a photograph of a working blue-light transparent OLED in front of a mirror, which shows emission from both surfaces. Although the efficiency and brightness of this transparent device may be lower than other reported devices, we demonstrate an approach to realize fully solution-processed transparent OLEDs without vacuum deposition.

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