Luminescence Mechanisms and Forster Resonance Energy Transfer in Fluorescent Gold Nanoclusters

• Main Authors: Chu-Chun Lin, 林竹君
• Other Authors: Ji-Lin Shen
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/67650244483353467694

碩士 === 中原大學 === 物理研究所 === 98 === 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.