| Project/Area Number |
26620202
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Device related chemistry
|
|---|
| Research Institution | Yamagata University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2014-04-01 – 2016-03-31
|
| Project Status |
Completed (Fiscal Year 2015)
|
| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
|
|---|
| 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 / 低電圧 / リン光発光材料 / 熱活性化遅延蛍光材料 / 分子配向 / 弱い分子間水素結合 / 燐光発光材料 |
|---|
| 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.
|
