2007 Fiscal Year Final Research Report Summary
Development of light emitting devices using artificial photonic synthesis model dendrimers
| Project/Area Number |
18550122
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional materials chemistry
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| Research Institution | Shizuoka University |
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Principal Investigator |
KAWAI Hideki Shizuoka University, Research Institute of Electronics, Associate Professor (80324341)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Masaki Shizuoka University, Faculty of Engineering, Assistant Professor (30313935)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Polymeric molecular structure / Photophysical properties / artificial photonic synthesis model / dendrimers / Emission |
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| Research Abstract |
Polymer laser devices attracted considerable attention for the next generation optical fiber for communications. In this works, we focused attention on photosensitized dendrimers as a novel polymer laser medium and measured amplified spontaneous emission (ASE) by chromophores (emission center) excitation through intramolecular energy transfer.
Novel photosensitized dendrimers were synthesized by combinatorial method employing direct coupling reactions of anthracene of branch units and perylene of a core unit. The fluorescence measurement with these dendrimers revealed that excitation of the anthracene groups led to the perylene core emissions, indicating efficient energy transfer should be involved.
Spin-coated polystyrene thin films containing those dendrimers were excited by the third harmonic of pulsed Nd: YAG laser (355 nm). The full width at half maximum of emission band of dendrimers having inner shell anthracene was decreased with increasing pumping energy (FWHM=47 nm). The spectral narrowing were attributed to the amplified spontaneous emission. Meanwhile, the emission spectra were hardly changed in the dendrimers without inner shell anthracene chromophores (FWHM = 84 nm). These results suggested that amplified spontaneous emission is affected by the energy transfer efficiency.
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