Improvement of Power Efficiency in Phosphorescent White Organic Light-Emitting Diodes Using p-Doped Hole Transport Layer
We investigated the optical and electrical properties of molybdenum trioxide- (MoO3-) doped (1,1-bis[(di-4-tolylamino)phenyl]cyclohexane) (TAPC) films with different doping concentrations. Based on our results, we have fabricated white organic light emitting diodes (WOLEDs) with multi-emitting layer...
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Wiley
2012-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2012/581421 |
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| author | Hyunkoo Lee Jun Young Kim Changhee Lee |
| author_facet | Hyunkoo Lee Jun Young Kim Changhee Lee |
| author_sort | Hyunkoo Lee |
| collection | DOAJ |
| description | We investigated the optical and electrical properties of molybdenum trioxide- (MoO3-) doped (1,1-bis[(di-4-tolylamino)phenyl]cyclohexane) (TAPC) films with different doping concentrations. Based on our results, we have fabricated white organic light emitting diodes (WOLEDs) with multi-emitting layer structures that consist of 1,3-bis(9-carbazolyl)benzene as a host and three phosphorescent dopants: iridium(III) bis[4,6-difluorophenyl]-pyridinato-N,C2′] picolinate as a blue dopant, bis(2-phenylbenxothiozolato-N,C2′)iridium(III) (acetylacetonate) as an orange dopant, and bis(1-phenylisoquinoline) (acetylacetonate) iridium(III) as a red dopant. We improved the power efficiency and decreased driving voltage of WOLEDs by employing a MoO3-doped TAPC layer as a hole transport layer. The MoO3-doped TAPC layer lowers the driving voltage by about 1.2 V and increases the power efficiency from 6.2lm⋅W−1 to 7.9lm⋅W−1 at 1,000cd⋅m−2, an approximately 27.4% increase. Furthermore, the WOLED has a high color-rendering index, which is about 86 with the Commission Internationale de l’Eclairage 1931 chromatic coordinates of (0.4303, 0.3893) and correlated color temperature of 3008 K. |
| format | Article |
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| institution | DOAJ |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
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| series | International Journal of Photoenergy |
| spelling | doaj-art-fa25b4e128cf4f81904cc44132a6d4c72025-08-20T03:20:03ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2012-01-01201210.1155/2012/581421581421Improvement of Power Efficiency in Phosphorescent White Organic Light-Emitting Diodes Using p-Doped Hole Transport LayerHyunkoo Lee0Jun Young Kim1Changhee Lee2Department of Electrical Engineering and Computer Science, Inter-University Semiconductor Research Center, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of KoreaDepartment of Electrical Engineering and Computer Science, Inter-University Semiconductor Research Center, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of KoreaDepartment of Electrical Engineering and Computer Science, Inter-University Semiconductor Research Center, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of KoreaWe investigated the optical and electrical properties of molybdenum trioxide- (MoO3-) doped (1,1-bis[(di-4-tolylamino)phenyl]cyclohexane) (TAPC) films with different doping concentrations. Based on our results, we have fabricated white organic light emitting diodes (WOLEDs) with multi-emitting layer structures that consist of 1,3-bis(9-carbazolyl)benzene as a host and three phosphorescent dopants: iridium(III) bis[4,6-difluorophenyl]-pyridinato-N,C2′] picolinate as a blue dopant, bis(2-phenylbenxothiozolato-N,C2′)iridium(III) (acetylacetonate) as an orange dopant, and bis(1-phenylisoquinoline) (acetylacetonate) iridium(III) as a red dopant. We improved the power efficiency and decreased driving voltage of WOLEDs by employing a MoO3-doped TAPC layer as a hole transport layer. The MoO3-doped TAPC layer lowers the driving voltage by about 1.2 V and increases the power efficiency from 6.2lm⋅W−1 to 7.9lm⋅W−1 at 1,000cd⋅m−2, an approximately 27.4% increase. Furthermore, the WOLED has a high color-rendering index, which is about 86 with the Commission Internationale de l’Eclairage 1931 chromatic coordinates of (0.4303, 0.3893) and correlated color temperature of 3008 K.http://dx.doi.org/10.1155/2012/581421 |
| spellingShingle | Hyunkoo Lee Jun Young Kim Changhee Lee Improvement of Power Efficiency in Phosphorescent White Organic Light-Emitting Diodes Using p-Doped Hole Transport Layer International Journal of Photoenergy |
| title | Improvement of Power Efficiency in Phosphorescent White Organic Light-Emitting Diodes Using p-Doped Hole Transport Layer |
| title_full | Improvement of Power Efficiency in Phosphorescent White Organic Light-Emitting Diodes Using p-Doped Hole Transport Layer |
| title_fullStr | Improvement of Power Efficiency in Phosphorescent White Organic Light-Emitting Diodes Using p-Doped Hole Transport Layer |
| title_full_unstemmed | Improvement of Power Efficiency in Phosphorescent White Organic Light-Emitting Diodes Using p-Doped Hole Transport Layer |
| title_short | Improvement of Power Efficiency in Phosphorescent White Organic Light-Emitting Diodes Using p-Doped Hole Transport Layer |
| title_sort | improvement of power efficiency in phosphorescent white organic light emitting diodes using p doped hole transport layer |
| url | http://dx.doi.org/10.1155/2012/581421 |
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