近紫外宽带激发LED用荧光材料的研究

发布时间：2018-03-13 07:20

本文选题：UV-LED　切入点：CdS量子点　出处：《上海师范大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,发光二极管(LED)凭借其高效节能的优势逐步得到人们的青睐,随之而来对LED用荧光材料的研究也逐渐引起极大的重视。本文旨在研究近紫外宽带激发的LED用荧光材料,分别研究了半导体发光材料在LED方面的应用以及一种Eu2+-Mn2+离子共掺的氟磷酸盐(Na2Mg PO4F:Eu2+,Mn2+)荧光材料,利用X-射线衍射(XRD)、场发射扫描电子显微镜(SEM)、高分辨透射电子显微镜(TEM)、紫外-可见吸收光谱(UV-Vis)、荧光光谱仪(PL)等检测手段对样品进行光电性能分析。在本文第二章中,运用高温注射法成功合成了3-5纳米左右的Cd S半导体准零维结构,研究了Cd S纳米材料的荧光性能,并将其应用在硅基太阳能电池上,与原片相比总电池效率有将近22.6%的提升;用同样的方法合成了微纳米Zn O以及Zn O/Cd S异质结构,其荧光性能得到大幅度提高。用传统的高温固相法合成的Zn O/Cd S异质结构,解决了大规模生产的工艺问题,本文研究了其交错生长的纤锌矿晶相结构和较稳定的荧光性能,并成功完成了稀土铕离子掺杂。在本文第三章中,我们用高温固相法合成并研究了基质Na2Mg PO4F的晶体基本构成:是以Na2Mg F2O11为晶胞堆积成的柱状结构,磷原子在柱列之间排列,从而形成Na2Mg PO4F晶体。通过Eu2+-Mn2+离子的掺杂浓度的调节得到了可从蓝紫光到橙黄光的光色可调的荧光粉,并能适应LED的实际工作环境。总而言之,材料显示了在LED上的潜在应用价值。
[Abstract]:In recent years, light emitting diode (LED) has been gradually favored by people because of its advantages of high efficiency and energy saving, and the research of fluorescent materials for LED has been paid more and more attention. The purpose of this paper is to study near-ultraviolet broadband excited fluorescent materials for LED. The applications of semiconductor luminescent materials in LED and a fluorophosphate (Na _ 2mg PO4F:Eu2 PO4F:Eu2 _ 2) fluorescent material co-doped with Eu2 -Mn2 ions were studied. The optoelectronic properties of the samples were analyzed by means of X-ray diffraction, field emission scanning electron microscopy (SEM), high resolution transmission electron microscope (TEM), UV-Vis-vis absorption spectroscopy (UV-Vis) and fluorescence spectrometer (PLL). Three to five nanometers of CDs semiconductors were successfully synthesized by high temperature injection method. The fluorescence properties of CDs nanomaterials were studied and applied to silicon based solar cells. The total cell efficiency was improved by nearly 22.6% compared with the original chip. Micro nano ZnO and Zn O / CD S heterostructures were synthesized by the same method, and their fluorescence properties were greatly improved. The conventional high temperature solid state synthesis of Zn O / CD S heterostructures solved the technological problems of large-scale production. In this paper, the crystal structure and stable fluorescence properties of wurtzite have been studied, and the doping of rare earth europium ions has been successfully completed. We have synthesized and studied the basic crystal composition of matrix Na2Mg PO4F by high temperature solid state method: it is a columnar structure with Na2Mg F _ 2O _ 11 as the unit cell, and the phosphorus atoms are arranged among the columns. Thus, Na2Mg PO4F crystal was formed. By adjusting the doping concentration of Eu2 -Mn2 ion, the luminous phosphors, which can be adjusted from blue violet light to orange and yellow light, were obtained and can adapt to the actual working environment of LED. The material shows the potential application value in LED.
【学位授予单位】：上海师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ422;TN312.8

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