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標題: | 表面電漿子耦合對經由膠體量子點從藍光量子井的多光色轉換行為之影響 Surface Plasmon Coupling Effects on the Conversion Behaviors of Multiple Light Colors through Colloidal Quantum Dots from Blue-emitting Quantum Wells |
作者: | Chia-Chun Ni 倪嘉均 |
指導教授: | 楊志忠(Chih-Chung Yang) |
關鍵字: | 表面電漿子共振,福斯特共振能量轉換, surface plasmon resonance,FRET, |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 我們展示了綠光及紅光量子點在連接上化學合成的銀奈米顆粒後,以滴液塗佈的方法鋪陳在表面沉積了銀奈米顆粒的藍光量子井基板上的發光行為。我們利用螢光衰減時間以及溫度變化的螢光強度比值來比較只有綠光量子點或紅光量子點以及兩者混和的樣品。當綠光及紅光量子點同時存在時,我們可以由螢光衰減時間估算從綠光量子點轉換到紅光量子點的福斯特共振能量轉換效率,然而綠光及紅光量子點的溫度變化螢光強度比值不再能視為其內部量子效率,此乃因為量子井、綠光量子點及紅光量子點的吸收與發光強度會隨著溫度不同而改變。根據螢光衰減時間的量測結果,我們發現銀奈米顆粒產生的侷域表面電漿子共振與量子點耦合時,會縮短綠光以及紅光量子點的螢光衰減時間,意味著其發光效率提升,然而表面電漿子耦合也會降低福斯特共振能量轉換效率,換句話說,表面電漿子耦合可以減少綠光轉換成紅光的能量,有助於增強綠光的發光強度。 The emission behaviors of green-emitting quantum dot (GQD) and red-emitting quantum dot (RQD) are demonstrated when they are linked with synthesized Ag nanoparticles (NPs) and drop casted onto a blue-emitting quantum-well (QW) template, which is overlaid with deposited Ag NPs. Samples of either GQD or RQD only and both GQD and RQD are prepared for comparing their photoluminescence (PL) decay times and temperature-dependent PL intensity ratios (TDIRs). The efficiencies of Förster resonance energy transfer (FRET) from GQD into RQD can be evaluated when both GQD and RQD exist in a sample. Because of the complicated temperature-dependent absorption and emission in QW, GQD, and RQD, a GQD or RQD TDIR can no longer be regarded as its internal quantum efficiency. Based on the results of PL decay times, it is found that surface plasmon (SP) coupling of Ag NPs can always reduce the PL decay time of GQD or RQD, implying the enhancement of its emission efficiency. However, SP coupling leads to the reduction of the FRET effect. In other words, the energy conversion from green into red light can be reduced that helps in increasing green emission. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/71927 |
DOI: | 10.6342/NTU202004269 |
全文授權: | 有償授權 |
顯示於系所單位: | 光電工程學研究所 |
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U0001-1410202015070000.pdf 目前未授權公開取用 | 6.78 MB | Adobe PDF |
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