新型四取代乙烯類及?喔?類染料分子的合成及其光學性質探討; Synthesis and Nonlinear Optical Properties of Novel Chromophores based on Four-Substitution Ethylene and Quinoxaline Structure

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/48094

Title:	新型四取代乙烯類及?喔?類染料分子的合成及其光學性質探討;Synthesis and Nonlinear Optical Properties of Novel Chromophores based on Four-Substitution Ethylene and Quinoxaline Structure
Authors:	黃鈺眞;Yu-chen Huang
Contributors:	化學研究所
Keywords:	喹喔啉;四取代乙烯;two-photon absorption
Date:	2011-08-27
Issue Date:	2012-01-05 14:29:43 (UTC+8)
Abstract:	本論文系統性設計與合成出具有新穎性的四取代乙烯類分子以及含有喹喔晽結構的染料分子，希望藉由有系統性的擴展分子結構的共軛系統來增進π-電子非定域化的範圍或是改變分子結構上推拉電子官能基促進分子內電荷轉移的程度，爾後探討分子結構的改變對雙光子吸收特性的影響。我們利用線性光學的量測結果，我們可以知道模型分子的最大吸收波長、最大發射波長、螢光生命期及利用積分球所量測出的絕對螢光量子產率非線性光學性質的部份，利用可調節波長之奈秒脈衝式雷射作為光源來激發模型分子，並藉由雙光子激發螢光強度與激發光源強度間關係證實觀察到的螢光現象確實是經由雙光子吸收所引起的。雙光子激發截面量測主要是藉由雙光子誘導螢光法測定，我們透過量測出的非線性光學性質進而探討分子結構與其雙光子激發截面間的關聯性，以下為本論文所歸納出的結果:(1)改變π-電子橋梁可促進分子內電荷轉移的程度，也有助於提升雙光子激發截面。(2)若增加分子結構外圍的分支數目其雙光子吸收效能將會大幅度提升。(3)分子結構中導入quinoxaline 官能基可以促進分子內電荷轉移的程度以提高模型分子的雙光子激發截面並有較長螢光生命期。 Several novel series of multi-branched organic-structures derived from functionalized fluorene and quinoxaline units have been synthesized and characterized for their linear and nonlinear optical properties.The experimental results show that either extending the　π-conjugation length by insertion of various aromatic units or increasing the number of peripheral branches in a dye molecule may enhance the molecular two-photon absorptivities. On the other hand, it has been demonstrate that incorporation of 2,3-difunctionalized quinoxaline units will lengthen the fluorescence lifetime of the studied chromophores and this feature is very　desirable for optical power limiting　application in nanosecond time　domin.
Appears in Collections:	[Graduate Institute of Chemistry] Electronic Thesis & Dissertation

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