2011 Fiscal Year Final Research Report
Optical power limiting materials with an ultralow threshold
| Project/Area Number |
22750132
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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 chemistry
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| Research Institution | Kyushu University |
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Principal Investigator |
HIRATA Shuzo 九州大学, 最先端有機光エレクトロニクス研究センター, 特任助教 (20552227)
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| Project Period (FY) |
2010 – 2011
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| Keywords | 生物性 |
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| Research Abstract |
We developed an organic RSA material that displays a large decrease in transmittance upon exposure to weak incoherent light, such as that from light emitting diodes(LEDs), at room temperature(RT) in air. To minimize threshold of transmittance decrease(Fth) and obtain a large decrease in transmittance, two kinds of guest compounds dispersed in an amorphous steroidal host matrix were used. One guest compound is a metal complex used as a donor for photosensitization and the other is a deuterated aromatic deuterated carbon that behaves as an acceptor to allow efficient accumulation of the Ti state. The accumulation of long-lived RT triplet excitons of the acceptor with a large triplet-triplet absorption coefficient by photosensitization of the donor allowed a drastic decrease in the power threshold to be realized.
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