| 說明 |
147 p |
| 附註 |
Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2351 |
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Chair: Alex K-Y. Jen |
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Thesis (Ph.D.)--University of Washington, 2003 |
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Many applications such as optical limiting, three-dimensional (3D) fluorescence microscopy and 3D microfabrication, etc. will greatly benefit from large two-photon absorption cross-section (delta2) of chromophores. Although various strategies for designing highly efficient two-photon absorbing molecules have been recently proposed including quadrupolar molecules with Donor-pi bridge-Donor (or Acceptor-pi bridge-Acceptor) architecture and dipolar molecules with Donor-pi-Acceptor motif, it remains much uncertainty in the structure/property relationships and a challenging task to design TPA chromophores with further enhanced delta2 |
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This dissertation presents our comprehensive study on two-photon absorbing materials, aiming to understand the details of structure/property relationships and design highly efficient two-photon absorbing materials. Chapter 1 presents the background on the theory of two-photon absorption and the development of two-photon absorbing materials. Chapter 2 described a two-photon-induced fluorescence technique setup in our lab for TPA properties measurements |
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In Chapter 3, we reported a series of efficient two-photon absorbing chromophores. The effects of pi-bridge, on two-photon absorption cross-section were also discussed. For the same type pi-bridge, we found that a power law dependence of two-photon absorption cross sections with lambda max when plotted in log-log format. Moreover, it is revealed that biphenyl-based chromophores showed more enhanced delta2 values than phenyl-based and polyene-based chromophores at a comparable wavelength |
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Chapter 4 is the study on the role of symmetry on the two-photon absorption cross-section. This study indicates that quadrupolar chromophores exhibit a better two-photon absorptivity than dipolar and octupolar chromophores. The solvent effects on the TPA cross section were discussed in Chapter 5. It is realized that molecular environments strongly affect the two-photon absorption cross-section. This factor should be considered for practical applications |
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Finally, the highest efficient TPA polymer to date was reported in Chapter 6. Through a systematic study on a series of conjugated polymers, it is revealed that the effective conjugation length and the electronic properties of the substituents play important roles in the enhancement of two-photon cross-section |
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School code: 0250 |
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DDC |
| Host Item |
Dissertation Abstracts International 64-05B
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| 主題 |
Engineering, Materials Science
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0794
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| Alt Author |
University of Washington
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