【摘要】：色域范圍是顯示器件性能的重要參數,量子點材料具有優異的發光性能,具有量子效率高、發光波長連續可調、半峰寬窄等特點,在提高顯示器件的色域方面具有突出優勢。經過多年的發展,基于量子點的背光源技術已經開始產業化,量子點背光液晶電視已經問世,正在進入推廣和擴大階段。然而量子點技術在材料和工藝等方面仍然存在很多工程問題,例如:量子點合成工藝復雜,還有很大的優化空間;與應用相關的量子點熱穩定性研究報道較少;與量子點匹配的封裝工藝還不成熟,目前采用的轉光膜或插入式的溶液都存在明顯的設計缺陷。本論文以面向廣色域白光LED應用的合金化綠光量子點為對象,開展了以合金化CdxZn1-xSeyS1-y量子點的包覆方法、熱穩定性及白光LED應用的研究。主要結果如下:(1)合金化CdxZn1-xSeyS1-y和CdxZn1-xSeyS1-y/ZnS量子點制備工藝的優化設計。采用高溫注入合成法制備了CdxZn1-xSeyS1-y量子點并研究了波長、半峰寬和熒光強度隨時間變化關系。通過比較不同包覆條件如:包覆溫度、包覆次數和包覆材料中硫醇的種類,得到了最優的包覆規律:采用十二硫醇作為包覆材料的硫源,低溫包覆多次或先低溫后高溫包覆多次。通過改變制備方法可以得到不同殼層厚度,能帶結構的不同量子效率為90%、波長為510-540nm、半峰寬小于35nm的材料。(2)合金化CdxZn1-xSeyS1-y和CdxZn1-xSeyS1-y/ZnS量子點熱穩定性的研究。在材料制備的上,比較不同殼層厚度,合金化梯度不同,厚殼層與既有梯度化又有薄殼層量子點的熱穩定性。根據理論分析提出了熱淬滅模型,并發現殼層厚度越厚,合金化梯度化越緩或兩者都有的量子點材料具有高的熱淬滅溫度。(3)與K2SiF6:Mn(KSF)配合制備應用于廣色域白光LED的器件。在材料制備的基礎上,采用雙色:綠色CdxZn1-xSeyS1-y/ZnS量子點,紅色K2SiF6:Mn(KSF)的策略,研究了CdxZn1-xSeyS1-y/ZnS量子點波長對白光LED器件色域的影響。采用波長為515nm,半峰寬為32nm的綠光量子點材料與KSF配合,制得高流明效率(35~60 lm/W)、色域為120%,匹配度為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，

本文編號：2483964