Symmetrical Emission Transparent Organic Light-Emitting Diodes With Ultrathin Ag Electrodes
This paper describes a way to implement a transparent electrode for symmetrical emission from the bottom and top sides of transparent organic light-emitting diodes (TOLEDs). An ultrathin (~6 nm) and smooth Ag film was achieved by using the pretreatment of using oxygen plasma prior to deposition of a...
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IEEE
2018-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/8332474/ |
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| author | Illhwan Lee Sungjun Kim Jae Yong Park Sungjoo Kim Hyung Won Cho Juyoung Ham Seungo Gim Kisoo Kim Kihyon Hong Jong-Lam Lee |
| author_facet | Illhwan Lee Sungjun Kim Jae Yong Park Sungjoo Kim Hyung Won Cho Juyoung Ham Seungo Gim Kisoo Kim Kihyon Hong Jong-Lam Lee |
| author_sort | Illhwan Lee |
| collection | DOAJ |
| description | This paper describes a way to implement a transparent electrode for symmetrical emission from the bottom and top sides of transparent organic light-emitting diodes (TOLEDs). An ultrathin (~6 nm) and smooth Ag film was achieved by using the pretreatment of using oxygen plasma prior to deposition of a nanoscale-thin Ag film on glass. The treatment increased the surface energy, thereby enhancing the wettability of the Ag on glass substrate and consequently leading to the formation of thin and unifrom Ag film with high optical transmittance T ~ 76% and low sheet resistance RS <; 15 Ω □<sup>-1</sup>. Using this scheme, a highly transparent glass/Ag/WO3 structure with T = 85.6%, and RS = 9.3 Ω □<sup>-1</sup> was designed (ITO: 83.1%, 10 Ω □<sup>-1</sup>). We conducted finite-domain time-difference simulation for this glass/Ag/WO3 electrode to design a weak microcavity structure that retained the transparency and emitting properties. This optimized structure of TOLEDs (Ag = 6 nm) showed higher T = 73.84% than those of ITO devices (T = 73.19%), and can induce the weak microcavity effect, resuting in improved electroluminescent properties and increased the luminance value from 38.25 to 56.25 cd A<sup>-1</sup> at 25 mA cm<sup>-2</sup>. |
| first_indexed | 2024-12-17T19:10:12Z |
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| id | doaj.art-d7983f44e98342c3acae1d9637a60920 |
| institution | Directory Open Access Journal |
| issn | 1943-0655 |
| language | English |
| last_indexed | 2024-12-17T19:10:12Z |
| publishDate | 2018-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj.art-d7983f44e98342c3acae1d9637a609202022-12-21T21:35:54ZengIEEEIEEE Photonics Journal1943-06552018-01-0110311010.1109/JPHOT.2018.28237598332474Symmetrical Emission Transparent Organic Light-Emitting Diodes With Ultrathin Ag ElectrodesIllhwan Lee0Sungjun Kim1Jae Yong Park2Sungjoo Kim3Hyung Won Cho4Juyoung Ham5Seungo Gim6Kisoo Kim7Kihyon Hong8Jong-Lam Lee9https://orcid.org/0000-0003-4502-9758Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, South KoreaDepartment of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, South KoreaDepartment of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, South KoreaDepartment of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, South KoreaDepartment of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, South KoreaDepartment of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, South KoreaDepartment of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, South KoreaDepartment of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, South KoreaDepartment of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, South KoreaDepartment of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, South KoreaThis paper describes a way to implement a transparent electrode for symmetrical emission from the bottom and top sides of transparent organic light-emitting diodes (TOLEDs). An ultrathin (~6 nm) and smooth Ag film was achieved by using the pretreatment of using oxygen plasma prior to deposition of a nanoscale-thin Ag film on glass. The treatment increased the surface energy, thereby enhancing the wettability of the Ag on glass substrate and consequently leading to the formation of thin and unifrom Ag film with high optical transmittance T ~ 76% and low sheet resistance RS <; 15 Ω □<sup>-1</sup>. Using this scheme, a highly transparent glass/Ag/WO3 structure with T = 85.6%, and RS = 9.3 Ω □<sup>-1</sup> was designed (ITO: 83.1%, 10 Ω □<sup>-1</sup>). We conducted finite-domain time-difference simulation for this glass/Ag/WO3 electrode to design a weak microcavity structure that retained the transparency and emitting properties. This optimized structure of TOLEDs (Ag = 6 nm) showed higher T = 73.84% than those of ITO devices (T = 73.19%), and can induce the weak microcavity effect, resuting in improved electroluminescent properties and increased the luminance value from 38.25 to 56.25 cd A<sup>-1</sup> at 25 mA cm<sup>-2</sup>.https://ieeexplore.ieee.org/document/8332474/Organic light-emitting diodetransparentultra-thinbi-directionalmicro-cavity. |
| spellingShingle | Illhwan Lee Sungjun Kim Jae Yong Park Sungjoo Kim Hyung Won Cho Juyoung Ham Seungo Gim Kisoo Kim Kihyon Hong Jong-Lam Lee Symmetrical Emission Transparent Organic Light-Emitting Diodes With Ultrathin Ag Electrodes IEEE Photonics Journal Organic light-emitting diode transparent ultra-thin bi-directional micro-cavity. |
| title | Symmetrical Emission Transparent Organic Light-Emitting Diodes With Ultrathin Ag Electrodes |
| title_full | Symmetrical Emission Transparent Organic Light-Emitting Diodes With Ultrathin Ag Electrodes |
| title_fullStr | Symmetrical Emission Transparent Organic Light-Emitting Diodes With Ultrathin Ag Electrodes |
| title_full_unstemmed | Symmetrical Emission Transparent Organic Light-Emitting Diodes With Ultrathin Ag Electrodes |
| title_short | Symmetrical Emission Transparent Organic Light-Emitting Diodes With Ultrathin Ag Electrodes |
| title_sort | symmetrical emission transparent organic light emitting diodes with ultrathin ag electrodes |
| topic | Organic light-emitting diode transparent ultra-thin bi-directional micro-cavity. |
| url | https://ieeexplore.ieee.org/document/8332474/ |
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