硫化物四元量子点的制备及发光性能研究

发布时间：2018-05-09 00:36

  本文选题：四元量子点 + 制备　； 参考：《天津理工大学》2015年硕士论文

【摘要】：半导体量子点具有独特光电性能,其发光光谱可以随量子点的粒径以及组成元素含量的变化而变化,而且具有一些经典的特性像光热和化学稳定性高、荧光量子效率高等,因此正越来越受到广大学者的关注。其制备流程越来越简单,合成成本也趋于低廉化。目前在太阳能电池、显示、生物荧光标记、非易失性存储器等领域得到广泛应用。虽然,基于Cd等重金属元素的II-VI族等半导体量子点(如Cd Se纳米材料)具有优良的单色性,但Cd和Pb自身的毒性限制了它在众多应用领域中的发展。所以,本文运用高温热分解方法合成了一系列Zn-Cu-In-S(ZCIS)及Zn-Ag-In-S(ZAIS)等不含有毒重金属元素的四元合金量子点,对其发光特性及热稳定性进行了一定的分析研究,并且最终在蓝光的激发下实现了白光发射。采用高温热分解法合成了一系列不同反应时间的Zn-Cu-In-S量子点,研究了同一反应温度下(220℃)不同反应时间对所制备Zn-Cu-In-S量子点发光性质的影响,发现随着反应时间的延长,Zn-Cu-In-S量子点的粒径逐渐增大,伴随发射光谱发生了明显的红移,发光光谱范围可以从黄绿光调节到深红光。测试了反应时间为60min的样品的变温光谱,并就其一些发光机制进行了研究。最后用450 nm左右的蓝光激发反应时间为10min的样品产生出了白光;研究了不同粒径对Zn-Cu-In-S量子点发光性质以及变温光谱一些性质的影响。具体的包括变温光谱本身的移动,光强度的变化趋势的比较,不同测试温度下Zn-Cu-In-S量子点带隙的变化趋势的比较以及半高宽的变化趋势的比较等。采用高温热分解法合成了一系列不同反应时间的Zn-Ag-In-S量子点,研究了同一反应温度下不同反应时间对所制备Zn-Ag-In-S量子点发光性质的影响,发现随着反应时间的延长,Zn-Ag-In-S量子点的粒径逐渐增大,伴随发射光谱发生了明显的红移;并测试了其红外傅里叶图谱,从图谱中得到Zn-Ag-In-S量子点的表面含有配体;并进一步对其寿命以及热稳定性进行了一定的研究。具体的包括变温光谱本身的移动,光强度的变化趋势的比较,不同测试温度下Zn-Ag-In-S量子点带隙的变化趋势的比较以及半高宽的变化趋势的比较等。
[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，

本文编号：1863818