【摘要】 硫量子点（SQDs）作为一类新的非金属元素量子点，不但具有绿色环保无毒的优点，而且制备简单、成本较低、溶解性好、光致发光（PL）特性稳定，引起了量子点领域研究人员极大的兴趣，在纳米电子学、光学、催化化学、生物医学以及传感器等领域都有较好的应用前景。目前有关硫量子点的研究主要集中在硫量子点的合成及提高光致发光性能方面，同碳量子点类似，这类量子点在紫外灯的照射下也可以显示不同颜色的光，但绿色荧光性能还需进一步提高。该研究主要采用超声辅助处理液相反应等方法来制备硫量子点，采用正十二硫醇（1-Dodecanethiol）的长链硫醇分子来提供硫源，利用一步法高温（240℃）加热，在很短的时间内（2h）成功合成了蓝色单质硫量子点（SQDs），并对合成的量子点进行了荧光光谱（PL）、吸收光谱（Abs）、拉曼光谱、红外吸收光谱、元素分析和形貌分析的表征。由实验可以看出，硫量子点从550nm就开始逐渐出现吸收，主要是由于量子点表面缺陷多所致；在450nm处出现明显的吸收边，对应能带吸收；在372nm处的吸收，归结为量子点中存在S₈^2-所导致的吸收。在330nm激发下，所合成的量子点呈现出明显的蓝光，主发射峰位于450nm处，主半峰宽大约50nm。而后分别改变反应温度和反应时间来合成不同量子点，实验发现随着反应温度的升高和反应时间的延长，所合成的硫量子点（SQDs）在330nm激发下均呈现出从蓝色到黄绿色的变化，荧光光谱（PL）发射峰主峰波长分别位于400、450和525nm，合成的硫量子点（SQDs）的发光量子产率（PLQY）可以达到1.48%。此外，我们利用合成的硫量子点（SQDs）首次制备电致发光器件，结构为ITO/PEDOT:PSS/PVK/SQDs/B₄PyMPM/LiF/Al，并测试器件的电致发光特性，成功获得了硫量子点（SQDs）位于472nm的蓝光发射，通过改变电子传输层B₄的厚度可以改变S-QLED器件的亮度，这为实现硫量子点（SQDs）的电致发光具有一定的指导作用。更多还原

【Abstract】 Sulfur quantum dots（SQDs）,as a new kind of quantum dots without metal elements,not only have the advantages of environmental protection and non-toxicity but also the advantages of simple preparation,low cost,good quality solubility,and stable photoluminescence（PL）characteristics.Sulfur quantum dots have aroused great interest from researchers in the quantum dot field and have good application prospects in nanoelectronics,optics,catalytic chemistry,biomedicine,and sensors.Currently,the research on sulfur quantum dots mainly focuses on synthesising sulfur quantum dots and improving photoluminescence properties.Like carbon dots,these quantum dots can also display different light colors under the irradiation of ultraviolet lamps,but the green fluorescence properties need to be further improved.At present,the research on sulfur quantum dots mainly focuses on the synthesis of sulfur quantum dots and the improvement of photoluminescence properties.Like carbon dots,these quantum dots can also display different light colors under the irradiation of ultraviolet lamps,but the green fluorescence properties need to be further improved.At present,sulfur quantum dots are mainly prepared by the ultrasonicassisted liquid-phase reaction.In this paper,long-chain thiol molecules of 1-dodecanethiol are used as a sulfur source,and blue elemental sulfur quantum dots are successfully synthesized in a short time （2h）by one-step heating at a high temperature（240℃）．The synthesized quantum dots are characterized by fluorescence spectrum （PL）,absorption spectrum （Abs）,Raman spectrum,infrared absorption spectrum,elemental analysis,and morphology analysis.It can be seen from the experiment that the absorption of sulfur quantum dots began gradually from 550nm,which was mainly due to many surface defects of quantum dots.There is an obvious absorption edge at 450nm,corresponding to band absorption;The absorption at 372nm is attributed to the absorption caused by S₈^2-in quantum dots.Under the excitation of 330nm,the synthesized quantum dots show obvious blue light,with the main emission peak at 450nm and the main half-peak width of about 50nm.Then,different quantum dots were synthesized by changing the reaction temperature and time,respectively.It was found that with the increase in reaction temperature and reaction time,the synthesized sulfur quantum dots（SQDs）showed a change from blue to yellow-green when excited at 330 nm,and the main peak wavelengths of the fluorescence spectrum （PL）were at 400,450and 525 nm,respectively.The luminescence quantum yield （PLQY）of the synthesized sulfur quantum dots （SQDs）could be 1.48%.In addition,we used synthesized sulfur quantum dots（SQDs）to prepare electroluminescent devices for the first time,with the structure of ITO/PEDOT:PSS/PVK/S-QDs/B₄PyMPM/LiF/Al.Then we tested the electroluminescent characteristics of the devices and successfully obtained the blue light emission of the sulfur quantum dots （SQDs）at 472nm.By changing the thickness of the electron transport layer B₄,the luminance of S-QLED devices can be changed,which has a specific guiding role in realizing the electroluminescence of sulfur quantum dots（SQDs）.更多还原