基于双极性主体结构的高效磷光OLED器件研究

发布时间：2018-05-25 00:31

本文选题：双极性主体 + 溶液法　；参考：《南京邮电大学》2015年硕士论文

【摘要】：有机电致发光器件(OLEDs)是第三代光电显示技术的主流产品。具有高效率的磷光OLED器件,其发光层通常通过能量较高的主体材料向磷光染料的能量传递来实现掺杂分子的发光。但是市面上的双极性材料非常的有限,混合主体(MH)结构构成双极性主体对拓宽载流子的复合区域、平衡电荷注入和传输、抑制结晶作用和提高器件性能有很大的意义,是改善溶液处理磷光有机发光二极管性能的有效方法。本论文主要研究溶液法制备双极性主体结构的磷光OLED器件:1.基于CBP和TCTA的双极性主体结构红色磷光OLED器件。采用器件结构ITO/PEDOT:PSS/Ir(pq)2(acac):TCTA:CBP/TPBi/LiF/Al,讨论了不同比例的混合主体对器件性能、电荷传输、发光层表面形貌和发光光谱的影响。该部分工作,达到国际同类工作的领先水平,为进一步研究其他颜色的磷光OLED器件,提供了重要依据。2.基于TAPC、mCP和OXD-7做主体的蓝色磷光材料FIrpic和深蓝色磷光材料FCNIrpic,基于CBP、TCTA和OXD-7做主体的绿色磷光材料Ir(ppy)3,分别通过优化染料掺杂浓度、主体混合比例及功能层的厚度等,得到高效的OLED器件。该部分课题的开展,为低成本,高效率,稳定的磷光OLED的应用提供广阔的发展前景。3.以新型主体材料DNCz PO为主体,沿用双极性主体平衡载流子传输的思路,加入适当比例的TAPC,溶液法制备获得可以和蒸镀材料发光性能相当的蓝光器件,并进一步制备了深蓝光和白光OLED器件。其中蓝光器件的最大电流效率29.9 cd/A,最大外量子效率16.5%,在高亮度下仍保持高效率。
[Abstract]:Organic electroluminescent devices (OLEDss) are the mainstream products of the third generation optoelectronic display technology. The luminescent layer of phosphorescent OLED devices with high efficiency is usually transmitted to phosphorescent dyes by the energy transfer of the host material with high energy to realize the luminescence of doped molecules. However, the bipolar materials available in the market are very limited. The structure of the mixed main body (MH) is of great significance in widening the recombination region of carriers, balancing charge injection and transmission, inhibiting crystallization and improving the performance of the devices. It is an effective method to improve the performance of phosphorescent organic light emitting diodes (OLEDs) treated with solution. In this thesis, we mainly study the preparation of bipolar phosphor OLED device by solution method. Red phosphorescence OLED device with bipolar main structure based on CBP and TCTA. The device structure ITO / PEDOT: PSS / PSS / PSS / PSS / TCTA-CBP / TPBi-LiF / Al is used to discuss the effects of different proportion of mixed agents on the device performance, charge transport, surface morphology and luminescence spectra. This part of the work has reached the leading level of similar international work, which provides an important basis for the further study of other color phosphorescent OLED devices. The blue phosphorescence material FIrpic and the dark blue phosphorescence material FCNIrpicbased on the basis of TCP and OXD-7, and the green phosphorescent material IrPppy3 based on CBP TCTA and OXD-7, were optimized by optimizing the dye doping concentration, the mixing ratio of the main body and the thickness of the functional layer, etc. An efficient OLED device is obtained. The development of this part provides a broad prospect for the application of low cost, high efficiency and stable phosphorescent OLED. A new type of main material, DNCz PO, was used to prepare blue light devices with the same luminescence performance as evaporating materials by using the idea of bipolar host balanced carrier transport and proper proportion of DNCz. Furthermore, dark blue and white OLED devices were fabricated. The maximum current efficiency of blue light device is 29.9 cdr / A, and the maximum external quantum efficiency is 16.5.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN383.1

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