有機薄膜摻入量子點之研究與應用; Study and applications of hybrid organic/ inorganic semiconductor quantum dots in thin films

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题名:	有機薄膜摻入量子點之研究與應用;Study and applications of hybrid organic/ inorganic semiconductor quantum dots in thin films
作者:	林宏儒;Lin,Hung-Ju
贡献者:	光電科學與工程學系
关键词:	半導體量子點;混和薄膜;semiconductor quantum dots;hybrid thin films
日期:	2014-01-13
上传时间:	2014-04-02 15:24:09 (UTC+8)
出版者:	國立中央大學
摘要:	半導體量子點近年來已吸引越來越多人投入進行研究，由於特殊的光電特性，使得它們在太陽能電池、光電元件及生醫領域有許多潛在的發展。本研究在於探討有機薄膜摻入量子點之研究，主要於PMMA有機薄膜摻入CdSe/ZnS量子點，並針對其光學特性做分析與探討，且提出相關之應用。在吸收與螢光光譜的分析中，我們得到此有機薄膜摻入量子點後有明顯的量子效應，進而我們也觀察到量子點之間的耦合現象(coupling effect)。另一方面，由於此量子點本身有很強的螢光激發現象，因此這些螢光若能夠在空間分佈上進一步做控制將可實現許多應用。有鑑於此，我們提出雙光柵週期結構薄膜，並以奈米熱壓印的技術實現之。從表面分析結果可確認所壓印的有機混和量子點薄膜與模具之間有很好的結構再現性。從數值計算中我們也得知，此週期結構之有機薄膜摻入量子點內部所產生的螢光激發，藉由週期結構之效應，能夠從空間中的近場到遠場做所需要的調整與控制。; Semiconductor quantum dots have attracted a lot of attention for their potential application in many fields such as optoelectronics and biology. In this study, we investigated the optical properties of hybrid nanocomposited thin films made of PMMA polymer containing different concentrations of core-shell CdSe/ZnS quantum dots. Both the absorption and luminescence spectra can be well explained by taking into account quantum mechanisms. From the luminescence spectral evidence of the coupling effect between quantum dots has been observed. With a pump laser emitting at 514 nm the luminescence spectrum centered at 560 nm strongly changes with time. In addition, it is necessary to control the luminescent light spatial distribution where the application is concerned. Therefore we proposed structural films with a bi-periodic grating by nanoimprint technique using an engraved silicon mold. The characterizations of the imprinted structure show good quality. We also showed, by a numerical calculation, that the local field is resonant in the periodic structure and that the emission diagram can be controlled in the far field.
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