2013 Fiscal Year Final Research Report
Development and function of novel electron-transporters realizinghigher order organic nanostructure for next generation organic LED
| Project/Area Number |
23750204
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Functional materials/Devices
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| Research Institution | Yamagata University |
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Principal Investigator |
SASABE Hisahiro 山形大学, 大学院・理工学研究科, 助教 (10570731)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 有機ELデバイス / リン光材料 / 電子輸送材料 / フェニルピリジン誘導体 / 三重項励起状態 / 分子間相互作用 / 水素結合 / 分子配向 |
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| Research Abstract |
Phosphorescent organic light-emitting device (organic LED) can realize four times higher efficiency than that in fluorescent organic LED. So far, our group has already developed high-efficiency sky-blue, green, and white organic LEDs with external quantum efficiency of 30%. These remarkable advances have been achieved by use of novel phosphorescent materials, especially phenylpyridine-containing electron transport materials (ETMs). However, there is few papers dealing with an effective molecular design for such ETMs. Generally, DFT calculation has been recognized as a powerful tool to design a promising material, however, this calculation can give only limited structural and optical properties in vacuum. While in organic LEDs, amorphous molecular glasses are normally used and solid state properties are critical for realizing high-efficiency devices. From this perspective, we have investigated the relationships among (1) DFT calculation, (2) physical properties and (3) overall device performances of novel ETMs with emphasis on the single crystal XRD analyses. Based on these analyses, we have successfully proposed a promising design for an ETM that can be self-assembled by using CH/N hydrogen bonds between pyridines in the solid state.
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