2011 Fiscal Year Final Research Report
Device properties and degradation mechanisms of organic light-emitting diodes composed of organic layers with orientation polarization
| Project/Area Number |
22750167
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Functional materials/Devices
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| Research Institution | Chiba University |
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Principal Investigator |
NOGUCHI Yutaka 千葉大学, 先進科学センター, 助教 (20399538)
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| Project Period (FY) |
2010 – 2011
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| Keywords | 有機EL素子 |
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| Research Abstract |
Findings of this study are as follows : 1) Several polar molecules that are commonly used in organic semiconductor devices spontaneously forms orientation polarization in their evaporated films. 2) The origin of interface charge at organic hetero interfaces is polarization charge originating from the orientation polarization. 3) Presence of polar molecules in the vicinity of organic hetero interface suppresses charge dispersion. 4) Light irradiation during the film formation of a polar molecule changes the charge accumulation property in the resultant devices, and causes a shorter lifetime. These findings indicate that permanent dipole moment is an important parameter that strongly affects on the device properties of organic semiconductor devices.
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