本文選題：四元量子點(diǎn) + 制備　； 參考：《天津理工大學(xué)》2015年碩士論文

【摘要】：半導(dǎo)體量子點(diǎn)具有獨(dú)特光電性能,其發(fā)光光譜可以隨量子點(diǎn)的粒徑以及組成元素含量的變化而變化,而且具有一些經(jīng)典的特性像光熱和化學(xué)穩(wěn)定性高、熒光量子效率高等,因此正越來越受到廣大學(xué)者的關(guān)注。其制備流程越來越簡單,合成成本也趨于低廉化。目前在太陽能電池、顯示、生物熒光標(biāo)記、非易失性存儲器等領(lǐng)域得到廣泛應(yīng)用。雖然,基于Cd等重金屬元素的II-VI族等半導(dǎo)體量子點(diǎn)(如Cd Se納米材料)具有優(yōu)良的單色性,但Cd和Pb自身的毒性限制了它在眾多應(yīng)用領(lǐng)域中的發(fā)展。所以,本文運(yùn)用高溫?zé)岱纸夥椒ê铣闪艘幌盗衂n-Cu-In-S(ZCIS)及Zn-Ag-In-S(ZAIS)等不含有毒重金屬元素的四元合金量子點(diǎn),對其發(fā)光特性及熱穩(wěn)定性進(jìn)行了一定的分析研究,并且最終在藍(lán)光的激發(fā)下實(shí)現(xiàn)了白光發(fā)射。采用高溫?zé)岱纸夥ê铣闪艘幌盗胁煌磻?yīng)時間的Zn-Cu-In-S量子點(diǎn),研究了同一反應(yīng)溫度下(220℃)不同反應(yīng)時間對所制備Zn-Cu-In-S量子點(diǎn)發(fā)光性質(zhì)的影響,發(fā)現(xiàn)隨著反應(yīng)時間的延長,Zn-Cu-In-S量子點(diǎn)的粒徑逐漸增大,伴隨發(fā)射光譜發(fā)生了明顯的紅移,發(fā)光光譜范圍可以從黃綠光調(diào)節(jié)到深紅光。測試了反應(yīng)時間為60min的樣品的變溫光譜,并就其一些發(fā)光機(jī)制進(jìn)行了研究。最后用450 nm左右的藍(lán)光激發(fā)反應(yīng)時間為10min的樣品產(chǎn)生出了白光;研究了不同粒徑對Zn-Cu-In-S量子點(diǎn)發(fā)光性質(zhì)以及變溫光譜一些性質(zhì)的影響。具體的包括變溫光譜本身的移動,光強(qiáng)度的變化趨勢的比較,不同測試溫度下Zn-Cu-In-S量子點(diǎn)帶隙的變化趨勢的比較以及半高寬的變化趨勢的比較等。采用高溫?zé)岱纸夥ê铣闪艘幌盗胁煌磻?yīng)時間的Zn-Ag-In-S量子點(diǎn),研究了同一反應(yīng)溫度下不同反應(yīng)時間對所制備Zn-Ag-In-S量子點(diǎn)發(fā)光性質(zhì)的影響,發(fā)現(xiàn)隨著反應(yīng)時間的延長,Zn-Ag-In-S量子點(diǎn)的粒徑逐漸增大,伴隨發(fā)射光譜發(fā)生了明顯的紅移;并測試了其紅外傅里葉圖譜,從圖譜中得到Zn-Ag-In-S量子點(diǎn)的表面含有配體;并進(jìn)一步對其壽命以及熱穩(wěn)定性進(jìn)行了一定的研究。具體的包括變溫光譜本身的移動,光強(qiáng)度的變化趨勢的比較,不同測試溫度下Zn-Ag-In-S量子點(diǎn)帶隙的變化趨勢的比較以及半高寬的變化趨勢的比較等。
[Abstract]:Semiconductor quantum dots have unique optoelectronic properties, their luminescence spectra can vary with the particle size of quantum dots and the content of constituent elements, and have some classical properties such as high photothermal and chemical stability, high fluorescence quantum efficiency and so on. Therefore, more and more scholars are paying attention to it. The preparation process is more and more simple, and the cost of synthesis tends to be low. At present, it is widely used in solar cells, display, bioluminescence labeling, nonvolatile memory and other fields. Although semiconductor quantum dots (such as CD se nanomaterials) based on heavy metal elements such as CD and II-VI have excellent monochromatic properties the toxicity of CD and Pb limits their development in many applications. Therefore, a series of quaternary alloy quantum dots without toxic heavy metals, such as Zn-Cu-In-Sn ZCISand Zn-Ag-In-Su ZAIS, have been synthesized by high temperature thermal decomposition method. The luminescence properties and thermal stability of these QDs have been studied. Finally, the white light emission is realized under the excitation of blue light. A series of Zn-Cu-In-S quantum dots with different reaction time were synthesized by high temperature thermal decomposition method. The effects of different reaction times on the luminescence properties of the prepared Zn-Cu-In-S quantum dots were studied at the same reaction temperature (220 鈩，

本文編號：1863818