2015 Fiscal Year Final Research Report
Challenges for the realization of extremely low-drive-voltage OLED
| Project/Area Number |
26620202
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Device related chemistry
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| Research Institution | Yamagata University |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Keywords | 有機EL / リン光 / 熱活性化遅延蛍光 / 低電圧化 / 電子輸送材料 / ホスト材料 |
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| Outline of Final Research Achievements |
Organic light-emitting devices (OLEDs) are expected to represent the next generation of solid-state lighting technology. In this work, we developed a series of novel electron-transporter and fabricated low-drive-voltage phosphorescent and thermally activated delayed fluorescence OLEDs with high external quantum efficiency as shown (i)-(iii). (i) 1,3,5-Triphenyltriazine-based electron transport materials form a highly horizontally oriented film by synergistic effect of intra- and intermolecular hydrogen bonds. Organic light-emitting devices employing this film as electron transport layer can operate at an extremely low voltage and realize high power efficiency. (ii) A state-of-the-art blue OLED that simultaneously realizes a driving voltage of 3.25 V, EQE of over 30%, and a power efficiency of 78 lm/W at high brightness of 1000 cd/m is developed. (iii) A green TADF OLED with an extremely high power efficiency of over 100 lm/W is realized through energy transfer from an exciplex.
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| Free Research Field |
デバイス関連化学
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