基于小分子材料的新型高性能有机发光二极管的制备

发布时间：2018-02-12 22:26

本文关键词： 有机电致发光掺杂发光区间效率衰减载流子分布　出处：《长春工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：有机电致发光器件(OLED)与其他显示器件相比具有许多优点。例如主动发光,不需要背光源,视角宽、亮度高、可弯曲、全固化等。虽然目前有机电致发光取得重大的进展,其产业化进程也在不断推进,但依然存在一些重要的问题,比如寿命问题、效率问题、色度问题、大尺寸问题以及工艺技术问题等等。要实现OLED的完全实用化、市场化,还有很多重大的理论和技术问题需要解决。本论文“基于小分子材料的新型高性能有机发光二极管的制备”通过探索有机电致发光机理,设计新型器件结构,并优化器件制备工艺,从而达到提高电致发光效率,降低工作电压,降低效率衰减,从而提高器件整体性能。(1)首先通过将Alq3精密掺杂到NPB薄膜中作为载流子传输层,设计和制作了一系列电子传输型器件,系统的研究了Alq3掺杂浓度对电子注入以及传输过程的影响。电压-电流密度曲线图表明:0.2%是敏化电子从空穴阻挡层注入到主体分子的最佳浓度,而0.6%则是电子传输主导机制转变的关键浓度。研究结果表明,当掺杂浓度高于0.6%时,电子在Alq3分子间的跳跃成为电子传输的主导机制。(2)以TcTa和26DCzPPy分别为第一发光层和第二发光层的主体材料,设计双发光层器件结构,进一步提高绿光材料(tfmppy)2Ir(tpip)的性能。与单发光层器件相比,这种器件结构能够有效地拓宽发光区间,平衡载流子的分布,并延缓效率的衰减。制备出结构为ITO/MoO3(3 nm)/TAPC(50 nm)/(tfmppy)2Ir(tpip)(6 wt%):TcTa(5nm)/(tfmppy)2Ir(tpip)(6 wt%):26DCzPPy(11 nm)/TmPyPB(45 nm)/LiF(1 nm)/Al(120nm)的绿色有机电致发光器件。器件的启亮电压为3.2 V,最大亮度、最大电流效率、最大功率效率和最大外量子效率分别为113610 cd/m2、112.30 cd/A、97.95 lm/W和29.4%,色坐标为(0.294,0.662)。在亮度为1000 cd/m2时,器件电流效率和外量子效率分别为107.60 cd/A和28.1%。(3)以此双发光层器件结构为基础,通过优化掺杂浓度和调整发光层厚度来进一步提高红光材料[Ir(MDQ)2(acac)]的性能。制备出结构为ITO/MoO3(3 nm)/TAPC(40nm)/Ir(MDQ)2(acac)(2.0 wt%):TcTa(10 nm)/Ir(MDQ)2(acac)(2.0 wt%):26DCzPPy(10nm)/TmPy PB(40 nm)/LiF(1 nm)/Al(100 nm)的红色有机电致发光器件。器件的启亮电压为3.4 V,最大亮度、最大电流效率、最大功率效率和最大外量子效率分别为73675cd/m2、44.76 cd/A、40.19 lm/W和15.5%,色坐标为(0.556,0.435)。在亮度为1000cd/m2时,器件电流效率和外量子效率分别为40.59 cd/A和14.1%。
[Abstract]:Organic electroluminescent devices (OLED) have many advantages over other display devices, such as active luminescence, no backlight, wide viewing angle, high brightness, bending, full curing, etc. But there are still some important problems, such as life, efficiency, chromaticity, large size, technology and so on. There are still many important theoretical and technical problems to be solved. In this thesis, "Fabrication of novel High performance Organic Light-emitting Diode based on small Molecular Materials", a novel device structure is designed by exploring the mechanism of organic electroluminescence. In order to improve the electroluminescence efficiency, reduce the working voltage and reduce the efficiency attenuation, the device can improve the overall performance of the device by doping Alq3 into the NPB film as carrier transport layer. A series of electronic transmission devices are designed and fabricated. The effect of doping concentration of Alq3 on the electron injection and its transport is systematically studied. The voltage-current density curve shows that the optimal concentration of the sensitized electron injected from the hole barrier layer to the host molecule is 0.2%. And 0.6% is the key concentration in the transition of electron transport mechanism. The results show that when the doping concentration is higher than 0.6, The electronic hopping between Alq3 molecules becomes the dominant mechanism of electron transport. (2) using TcTa and 26DCzPPy as the main materials of the first and second luminescent layers respectively, the structure of the double light-emitting layer device is designed. Compared with the single luminescent layer device, this device structure can effectively widen the luminescence range and balance the carrier distribution. The green organic electroluminescent devices with the structure of ITO/MoO3(3 nm)/TAPC(50 nm)/(tfmppy)2Ir(tpip)(6 wt%):TcTa(5nm)/(tfmppy)2Ir(tpip)(6 wt%):26DCzPPy(11 nm)/TmPyPB(45 nm)/LiF(1 NMU / AlN 120nm have been fabricated. The starting voltage of the device is 3.2 V, the maximum brightness and current efficiency are 3.2 V, the maximum current efficiency, the maximum luminance, the maximum current efficiency, the maximum luminance, the maximum current efficiency, the maximum luminance and the maximum current efficiency. The maximum power efficiency and the maximum external quantum efficiency are 113610 CD / m ~ (2) and 112.30 CD / A 97.95 lm/W and 29.4 lm/W, respectively, and the color coordinate is 0.294 ~ 0.6620.The current efficiency and the external quantum efficiency of the device are 107.60 cd/A and 28.1um 路L ~ (-3), respectively, when the luminance is 1 000 cd/m2. The red organic electroluminescent devices with the structure of ITO/MoO3(3 nm)/TAPC(40nm)/Ir(MDQ)2(acac)(2.0 wt%):TcTa(10 nm)/Ir(MDQ)2(acac)(2.0 wt%):26DCzPPy(10nm)/TmPy PB(40 nm)/LiF(1 nm)/Al(100 Nm were fabricated by optimizing the doping concentration and adjusting the thickness of the luminescent layer to further improve the properties of the red light material. The starting voltage of the device was 3.4 V, and the maximum brightness was obtained. The maximum current efficiency, the maximum power efficiency and the maximum external quantum efficiency are 73675cd / m2 and 44.76cd/ m2n 40.19 lm/W and 15.5cm, respectively, and the color coordinate is 0.556n0.4350.The current efficiency and the external quantum efficiency of the device are 40.59 cd/A and 14.1cm ~ (-1), respectively, when the luminance is 1000cdr ~ (m ~ 2).
【学位授予单位】：长春工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN383.1

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