Organic Light-Emitting Diode with Color Tunable between Bluish-White Daylight and Orange-White Dusk Hue
The varying color of sunlight diurnally exhibits an important effect on circadian rhythm of living organisms. The bluish-white daylight that is suitable for work shows a color temperature as high as 9,000 K, while the homey orange-white dusk hue is as low as 2,000 K. We demonstrate in this report th...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2014/480829 |
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| author | Shih-Yun Liao Sudhir Kumar Hui-Huan Yu Chih-Chia An Ya-Chi Wang Jhong-Wei Lin Yung-Lee Wang Yung-Chun Liu Chun-Long Wu Jwo-Huei Jou |
| author_facet | Shih-Yun Liao Sudhir Kumar Hui-Huan Yu Chih-Chia An Ya-Chi Wang Jhong-Wei Lin Yung-Lee Wang Yung-Chun Liu Chun-Long Wu Jwo-Huei Jou |
| author_sort | Shih-Yun Liao |
| collection | DOAJ |
| description | The varying color of sunlight diurnally exhibits an important effect on circadian rhythm of living organisms. The bluish-white daylight that is suitable for work shows a color temperature as high as 9,000 K, while the homey orange-white dusk hue is as low as 2,000 K. We demonstrate in this report the feasibility of using organic light-emitting diode (OLED) technology to fabricate sunlight-style illumination with a very wide color temperature range. The color temperature can be tuned from 2,300 K to 9,300 K, for example, by changing the applied voltage from 3 to 11 V for the device composing red and yellow emitters in the first emissive layer and blue emitter in the second. Unlike the prior arts, the color-temperature span can be made much wider without any additional carrier modulation layer, which should enable a more cost effective fabrication. For example, the color-temperature span is 7,000 K for the above case, while it is 1,700 K upon the incorporation of a nanoscale hole modulation layer in between the two emissive layers. The reason why the present device can effectively regulate the shifting of recombination zone is because the first emissive layer itself possesses an effective hole modulation barrier of 0.2 eV. This also explains why the incorporation of an extra hole modulation layer with a 0.7 eV barrier did not help extend the desirable color-temperature span since excessive holes may be blocked. |
| format | Article |
| id | doaj-art-cc295005a93949b2996584d7c2958c0c |
| institution | Kabale University |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-cc295005a93949b2996584d7c2958c0c2025-02-03T01:12:24ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2014-01-01201410.1155/2014/480829480829Organic Light-Emitting Diode with Color Tunable between Bluish-White Daylight and Orange-White Dusk HueShih-Yun Liao0Sudhir Kumar1Hui-Huan Yu2Chih-Chia An3Ya-Chi Wang4Jhong-Wei Lin5Yung-Lee Wang6Yung-Chun Liu7Chun-Long Wu8Jwo-Huei Jou9Department of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu 30013, TaiwanDepartment of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu 30013, TaiwanDepartment of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu 30013, TaiwanDepartment of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu 30013, TaiwanDepartment of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu 30013, TaiwanDepartment of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu 30013, TaiwanDepartment of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu 30013, TaiwanDepartment of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu 30013, TaiwanDepartment of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu 30013, TaiwanDepartment of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu 30013, TaiwanThe varying color of sunlight diurnally exhibits an important effect on circadian rhythm of living organisms. The bluish-white daylight that is suitable for work shows a color temperature as high as 9,000 K, while the homey orange-white dusk hue is as low as 2,000 K. We demonstrate in this report the feasibility of using organic light-emitting diode (OLED) technology to fabricate sunlight-style illumination with a very wide color temperature range. The color temperature can be tuned from 2,300 K to 9,300 K, for example, by changing the applied voltage from 3 to 11 V for the device composing red and yellow emitters in the first emissive layer and blue emitter in the second. Unlike the prior arts, the color-temperature span can be made much wider without any additional carrier modulation layer, which should enable a more cost effective fabrication. For example, the color-temperature span is 7,000 K for the above case, while it is 1,700 K upon the incorporation of a nanoscale hole modulation layer in between the two emissive layers. The reason why the present device can effectively regulate the shifting of recombination zone is because the first emissive layer itself possesses an effective hole modulation barrier of 0.2 eV. This also explains why the incorporation of an extra hole modulation layer with a 0.7 eV barrier did not help extend the desirable color-temperature span since excessive holes may be blocked.http://dx.doi.org/10.1155/2014/480829 |
| spellingShingle | Shih-Yun Liao Sudhir Kumar Hui-Huan Yu Chih-Chia An Ya-Chi Wang Jhong-Wei Lin Yung-Lee Wang Yung-Chun Liu Chun-Long Wu Jwo-Huei Jou Organic Light-Emitting Diode with Color Tunable between Bluish-White Daylight and Orange-White Dusk Hue International Journal of Photoenergy |
| title | Organic Light-Emitting Diode with Color Tunable between Bluish-White Daylight and Orange-White Dusk Hue |
| title_full | Organic Light-Emitting Diode with Color Tunable between Bluish-White Daylight and Orange-White Dusk Hue |
| title_fullStr | Organic Light-Emitting Diode with Color Tunable between Bluish-White Daylight and Orange-White Dusk Hue |
| title_full_unstemmed | Organic Light-Emitting Diode with Color Tunable between Bluish-White Daylight and Orange-White Dusk Hue |
| title_short | Organic Light-Emitting Diode with Color Tunable between Bluish-White Daylight and Orange-White Dusk Hue |
| title_sort | organic light emitting diode with color tunable between bluish white daylight and orange white dusk hue |
| url | http://dx.doi.org/10.1155/2014/480829 |
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