面向广色域白光LED应用的合金化绿光量子点研究
发布时间：2019-05-23 14:10
【摘要】：色域范围是显示器件性能的重要参数,量子点材料具有优异的发光性能,具有量子效率高、发光波长连续可调、半峰宽窄等特点,在提高显示器件的色域方面具有突出优势。经过多年的发展,基于量子点的背光源技术已经开始产业化,量子点背光液晶电视已经问世,正在进入推广和扩大阶段。然而量子点技术在材料和工艺等方面仍然存在很多工程问题,例如:量子点合成工艺复杂,还有很大的优化空间;与应用相关的量子点热稳定性研究报道较少;与量子点匹配的封装工艺还不成熟,目前采用的转光膜或插入式的溶液都存在明显的设计缺陷。本论文以面向广色域白光LED应用的合金化绿光量子点为对象,开展了以合金化CdxZn1-xSeyS1-y量子点的包覆方法、热稳定性及白光LED应用的研究。主要结果如下:(1)合金化CdxZn1-xSeyS1-y和CdxZn1-xSeyS1-y/ZnS量子点制备工艺的优化设计。采用高温注入合成法制备了CdxZn1-xSeyS1-y量子点并研究了波长、半峰宽和荧光强度随时间变化关系。通过比较不同包覆条件如:包覆温度、包覆次数和包覆材料中硫醇的种类,得到了最优的包覆规律:采用十二硫醇作为包覆材料的硫源,低温包覆多次或先低温后高温包覆多次。通过改变制备方法可以得到不同壳层厚度,能带结构的不同量子效率为90%、波长为510-540nm、半峰宽小于35nm的材料。(2)合金化CdxZn1-xSeyS1-y和CdxZn1-xSeyS1-y/ZnS量子点热稳定性的研究。在材料制备的上,比较不同壳层厚度,合金化梯度不同,厚壳层与既有梯度化又有薄壳层量子点的热稳定性。根据理论分析提出了热淬灭模型,并发现壳层厚度越厚,合金化梯度化越缓或两者都有的量子点材料具有高的热淬灭温度。(3)与K2SiF6:Mn(KSF)配合制备应用于广色域白光LED的器件。在材料制备的基础上,采用双色:绿色CdxZn1-xSeyS1-y/ZnS量子点,红色K2SiF6:Mn(KSF)的策略,研究了CdxZn1-xSeyS1-y/ZnS量子点波长对白光LED器件色域的影响。采用波长为515nm,半峰宽为32nm的绿光量子点材料与KSF配合,制得高流明效率(35~60 lm/W)、色域为120%,匹配度为100%的白光LED。
[Abstract]:Gamut range is an important parameter to display the performance of the device. Quantum dot materials have excellent luminous properties, high quantum efficiency, continuously adjustable luminous wavelength, narrow half peak width and so on. QDs have outstanding advantages in improving the color gamut of display devices. After years of development, the backlight technology based on quantum dots has begun to industrialization, quantum dot backlight liquid crystal TV has come out, is entering the stage of promotion and expansion. However, there are still many engineering problems in the material and process of quantum dot technology, such as: the synthesis process of quantum dots is complex and there is still a lot of room for optimization, and there are few reports on the thermal stability of quantum dots related to applications. The packaging technology matching quantum dots is not yet mature, and there are obvious design defects in the light conversion film or plug-in solution used at present. In this paper, the coating method, thermal stability and white LED application of alloyed green light quantum dots for wide-color white LED applications are studied. The main results are as follows: (1) the optimal design of the preparation process of alloyed CdxZn1-xSeyS1-y and CdxZn1-xSeyS1-y/ZnS quantum dots. CdxZn1-xSeyS1-y quantum dots were prepared by high temperature injection synthesis and the relationship between wavelength, half peak width and fluorescence intensity with time was studied. By comparing the different coating conditions, such as coating temperature, coating times and the types of mercaptan in the coating material, the optimal coating law was obtained: dodecyl mercaptan was used as the sulfur source of the coating material. Low temperature coating many times or first low temperature and then high temperature coating many times. By changing the preparation method, different shell thickness can be obtained, the different quantum efficiency of energy band structure is 90%, and the wavelength is 510 鈮，
本文编号：2483964
[Abstract]:Gamut range is an important parameter to display the performance of the device. Quantum dot materials have excellent luminous properties, high quantum efficiency, continuously adjustable luminous wavelength, narrow half peak width and so on. QDs have outstanding advantages in improving the color gamut of display devices. After years of development, the backlight technology based on quantum dots has begun to industrialization, quantum dot backlight liquid crystal TV has come out, is entering the stage of promotion and expansion. However, there are still many engineering problems in the material and process of quantum dot technology, such as: the synthesis process of quantum dots is complex and there is still a lot of room for optimization, and there are few reports on the thermal stability of quantum dots related to applications. The packaging technology matching quantum dots is not yet mature, and there are obvious design defects in the light conversion film or plug-in solution used at present. In this paper, the coating method, thermal stability and white LED application of alloyed green light quantum dots for wide-color white LED applications are studied. The main results are as follows: (1) the optimal design of the preparation process of alloyed CdxZn1-xSeyS1-y and CdxZn1-xSeyS1-y/ZnS quantum dots. CdxZn1-xSeyS1-y quantum dots were prepared by high temperature injection synthesis and the relationship between wavelength, half peak width and fluorescence intensity with time was studied. By comparing the different coating conditions, such as coating temperature, coating times and the types of mercaptan in the coating material, the optimal coating law was obtained: dodecyl mercaptan was used as the sulfur source of the coating material. Low temperature coating many times or first low temperature and then high temperature coating many times. By changing the preparation method, different shell thickness can be obtained, the different quantum efficiency of energy band structure is 90%, and the wavelength is 510 鈮，
本文编号：2483964
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