螢光金奈米團簇的發光機制及螢光共振能量轉換

Luminescence Mechanisms and Forster Resonance Energy Transfer in Fluorescent Gold Nanoclusters

林竹君(Chu-Chun Lin)

指導教授 ： 沈志霖

中原大學/理學院/物理研究所/碩士(2011年)

https://doi.org/10.6840/CYCU.2011.00162

摘要

摘要

本論文我們分成兩部分，第一部分利用光激螢光光譜、光激螢光激發光譜、以及時間解析光激螢光光譜研究螢光金奈米團簇之螢光機制。首先我們以HOMO-LUMO解釋發光模型，並觀察到螢光金奈米團簇中的載子侷限效應與外層接枝有很大的關係，也由變溫時間解析光激螢光光譜得到載子呈現零維的行為，並根據載子生命期的放射能量，認為螢光金奈米團簇短時間及長時間的螢光衰減分別源自於Au-S鍵結以及Au-S-Au的訂書針結構。
在論文的第二部分中，我們找到一個非接觸式的方法，使氮化銦鎵量子井(施子)的螢光利用類似螢光共振能量轉移的方式讓螢光金奈米團簇(受子)發光。在螢光共振能量轉移的過程中，藉由在氮化銦鎵層的全反射使氮化銦鎵施子受到激發。從施子與受子的螢光強度與生命期等實驗，計算出轉移效率為0.72且佛洛斯特半徑為2.33 nm。

關鍵字

螢光共振能量轉移 ； 奈米金團簇

並列摘要

Abstract

In this thesis, we have two parts to present. In the part one we investigated luminescence mechanism of fluorescent gold nanoclusters (FGNCs) by photoluminescence (PL) , time-resolved PL and photoluminescence-excitation (PLE). The luminescence mechanism in FGNCs is explained by the HOMO-LUMO gap. The effect of carrier localization in FGNCs was found to depend on the capping molecules. The zero-dimensionality of carriers in FGNCs was demonstrated by the temperature dependence of the time-resolved PL. Based on the emission-energy of carrier lifetimes, we suggest that the fast and slow PL decay of FGNCs originates from recombination of the linear Au–S bond and the staple motif, respectively.
In the second part, we explore a ‘non-contact’ approach to inject carriers into Au NCs (acceptors) using Förster-like non-radiative energy transfer from a single InGaN/GaN quantum well (donors). The excitation of donors is implemented indirectly via total internal reflection in the InGaN layer. The energy transfer efficiency is demonstrated to be 0.72 by studies of the PL intensities and lifetimes of donors and acceptors. we also calculated the Förster radius is 2.33nm.

並列關鍵字

forster resonance energy transfer ； Au nanocluster

參考文獻

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