| 研究生: |
鄭士豪 Cheng, Shih-hao |
|---|---|
| 論文名稱: |
微波法製備CdS 和CdSe 量子點及電噴霧法製
備P-N Type 發光膜之研究 Preparation of CdS and CdSe Quantum Dots by Microwave Heating Method and P-N Type Luminescence Thin Films by Electrospraying Method |
| 指導教授: |
陳進成
Chen, Chin-Cheng |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
| 論文出版年: | 2006 |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 150 |
| 中文關鍵詞: | 量子點 、CdS 、微波法 |
| 外文關鍵詞: | quantum dots, CdS, microwave method |
| 相關次數: | 點閱:150 下載:2 |
| 分享至: |
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目前的照明設備,多數會產生熱及污染等的問題,因此開發具有無水銀污染、發光效率高等優點之半導體發光二極體為必然趨勢。本研究構想製作量子點型的發光二極體,利用量子點本身高效能的發光,藉由量子侷限效應在可見光譜的發光波長內調控發光顏色。
本論文首先以化學溶膠法配合微波加熱法,利用N,N -二甲基甲醯胺作為反應溶劑,製備p(CdSe)-n(CdS)型之量子點,另外探討改變前驅物組成、掺雜銅對CdS量子點光譜、粒徑、晶相、型態之影響。接著利用電噴霧系統輔以電場收集器找出最佳薄膜收集的條件,利用電噴霧法噴出含有p及n型微粒的帶電液滴,經高溫爐將液體蒸發,微粒根據電移率的不同由電場收集器收集在矽基板上,在特定電壓下收集特定大小的微粒製成薄膜,並對薄膜做光譜、p-n型態、組成、晶相、表面形態和UV燈光照射產生螢光等分析。
以微波加熱能簡便的製備出高發光亮度且具有量子侷限效應之p(CdSe)-n(CdS)微粒,且成功的改變硫化鎘前驅物元素組成及掺雜銅製備出p型的硫化鎘。利用最佳薄膜製備收集條件配合電場收集器製作緻密且均勻之p及n型薄膜,藉由薄膜粒徑的改變及不同材料發光波長位置不同,利用UV燈光照射產生不同顏色之螢光。
Light-emitting diodes (LEDs) have the advantages of no mercury pollution and high emission efficiency. Developments of LEDs not only serve to improve the disadvantages of traditional illuminants but also save the energy and protect the environment of the world. This research is speculation manufacture QD LED. Make use the high performance luminescence and limit the quantum confinement effect to control the luminescence color of QD
In this study, n-CdS/p-CdSe QDs are synthesized by sol-gel method assisted with microwave heating. The influences of microwave heating time, using the solution with the different molar ratio S/Cd and Cu-doped on the size of CdS QD were investigated.
The QD thin films were fabricated using an electrospray assisted an electrostatic collector from QD/ethanol solution. Particles were collected at a specific location for a specific voltage according to their mobility. The size distribution of QD were analyzed by SMPS (Scanning Mobility Particle Sizer) and TEM. The nanostructure and crystallization of the thin film were analyzed by means of XRD and SEM. In addition, the optical and electric properties were measured by PL and CL. The UV fluorescent was observed emitted lights of QD films.
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