架設Z-Scan量測技術並應用於強放光之異種金屬錯合物的雙光子吸收研究

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架設Z-Scan量測技術並應用於強放光之異種金屬錯合物的雙光子吸收研究

Set-up of Z-scan Technique and Its Application in Two-photon Absorption of Heterometallic Complexes with Intensive Luminescence

林奕志 , Masters　　Advisor：周必泰　　

英文

Z-scan量測技術；雙光子吸收；異種金屬錯合物；金(I)-銅(I)錯合物；金(I)-銀(I)錯合物；銀(I)-銅(I)錯合物； Z-scan technique ； two-photon absorption ； heterometallic complexes ； Au(I)-Cu(I) complexes ； Au(I)-Ag(I) complexes ； Ag(I)-Cu(I) complexes

Abstract │ Reference (133) │ Altmetrics

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The z-scan technique involves moving a sample along the path of a focused laser beam and measuring the light intensity at the detector as a function of its position along this z-axis (Chapter 1). If the detector has a narrow aperture (as in the so called “closed-aperture” setup), then the output is sensitive to intensity-dependent changes in the refractive index (as a result of third-order nonlinear polarizability or thermal effects) which lead to self-focusing or defocusing of the beam. Alternatively, if the detector collects all the light from the sample (“open-aperture” setup), then the output only reflects the intensity-dependent transmission, and can be used to measure two-photon absorption cross-sections.
    In this thesis, we studied the photophysical property and two-photon absorption cross-section for a series of AuI-CuI, AuI-AgI and AgI-CuI heterometallic alkynyl-diphosphine (diphosphine = PPh2-(C6H4)n-PPh2, n = 1, 2, 3) clusters (Chapter 3-7), which display a very intriguing structural pattern based on the heterometallic [AuxMy(C2Ph)2x]y-x fragments “wrapped” by the [Au3(diphosphine)3]3+ “belts”. As results, these complexes exhibit large two-photon absorption cross-sections and intense phosphores due to the transition involving metal-ligand charge transfer such that the heavy metal (Au) enhances spin-orbit coupling. More importantly, owing to fully protected chromophore by the bulky ancillary and bridging ligands, the phosphorescence is nearly inert to oxygen quenching. In combination the intensive phosphorescence intensity, minor O2 quenching property and the two-photon absorption property demonstrate these compounds with promising potential in two-photon emission imaging as well as phosphorescence dyes in time-resolved imaging.

Reference ( 133 ) 〈TOP〉

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8. Bernard B., Molecular Fluorescence: Principles and Applications, Wiley-VCH, New York, 2004.
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