高性能有机电致白光器件的研究

发布时间：2018-06-20 07:45

本文选题：有机电致发光器件 + 载流子复合　；参考：《南京邮电大学》2015年硕士论文

【摘要】：有机电致白光器件(WOLED)虽然在器件效率、发光亮度以及器件寿命等方面取得了一定的进展。但仍然存在很多问题有待解决,如器件结构复杂、器件稳定性差、器件效率衰减(roll-off)严重。本文围绕WOLED器件载流子复合区域调控、提高器件效率及稳定性、简化器件结构几方面展开深入研究,具体研究包括以下几个内容:(1)在双层互补色发光层器件中,首次创新性地利用控制有机蒸发源和基片空间位置固定的蒸镀方法实现梯形状的空穴传输层,即空穴传输层材料TAPC在整个发光点中厚度从10nm到30 nm递增,从而导致空穴传输能力呈现递增变化,最终使得载流子复合的位置和形状发生变化。这种载流子的复合形状可以降低发光层中蓝光激子和黄光激子之间的能量传递来提高器件的效率及光谱稳定性,器件的电流效率达到31.4 cd/A。(2)利用新型主体材料DNCzPS和蓝光发光材料Firpic制备及优化出高效的蓝色磷光OLED,系统地研究了发光层主客体掺杂比例、空穴传输层厚度、电子传输层厚度等对器件性能的影响,器件电流效率可以达到39.7 cd/A。所以,我们考虑在此高效蓝光的基础上制备出高效的有机电致白光器件(WOLED)。而且系统地研究了黄光发光层厚度、位置对白光器件性能的影响。发现当黄光发光层厚度为0.25 nm,且距离蓝光发光层3 nm时器件性能达到最佳。器件的电流效率、功率效率、外量子效率分别为40.6 cd/A、32.3 lm/W和16.4%。最后,我们也尝试了用DNCzPS做主体材料掺杂了延迟荧光材料4Cz IPN制备了绿光TADF型器件,获得了不错的器件效果,电流效率、功率效率、外量子效率分别为38.5 cd/A、27.3 lm/W和15.2%。(3)用乙烯基芴苯胺为中心合成的小分子F、FF和聚合物PF制备了结构简单的单分子白光器件。F单分子器件的电流效率为0.79 cd/A,功率效率0.73 lm/W,外量子效率为0.6%,色坐标为(0.32;0.33);FF单分子器件的电流效率为1.75 cd/A,功率效率1.61 lm/W,外量子效率为1.3%,色坐标为(0.26;0.30);PF单分子器件的电流效率为4.5 cd/A,功率效率4.2 lm/W,外量子效率为2.6%,色坐标为(0.32;0.30)。
[Abstract]:Although the organic white light device (WOLED) has made some progress in the aspects of device efficiency luminescence luminance and device lifetime. However, there are still many problems to be solved, such as complex device structure, poor device stability and device efficiency attenuation. In this paper, the carrier recombination region regulation of WOLED devices, the improvement of device efficiency and stability, and the simplification of device structure are studied in detail, including the following contents: 1) in two-layer complementary chromatic light-emitting layer devices. For the first time, the cavitation transport layer with ladder shape is realized by using the method of controlling the organic evaporation source and the fixed space position of the substrate, that is, the thickness of the hole transport layer material increases from 10nm to 30 nm in the whole luminescence point. Therefore, the hole transport capacity changes gradually, and finally the position and shape of carrier recombination change. The complex shape of the carrier can reduce the energy transfer between the blue exciton and the yellow exciton in the luminescence layer to improve the efficiency and spectral stability of the device. The novel host material DNCzPS and the blue luminescent material Firpic are used to prepare and optimize the efficient blue phosphorescence OLED. The doping ratio of host and guest and the thickness of hole transport layer are systematically studied. The effect of the thickness of the electron transport layer on the performance of the device shows that the current efficiency of the device can reach 39.7 CD / A. Therefore, we consider the preparation of high efficiency organic white light device based on the high efficiency blue light. The influence of the thickness and position of yellow luminescent layer on the performance of white light device is studied systematically. It is found that when the thickness of yellow photoluminescence layer is 0.25 nm and the distance from blue luminescence layer is 3 nm, the device performance is optimal. The current efficiency, power efficiency and external quantum efficiency of the device are 40.6 CD / A 32.3 LM / W and 16.4F, respectively. Finally, we also try to fabricate green TADF devices using DNCzPS as main material and delay fluorescence material 4Cz IPN, and get good device effect, current efficiency and power efficiency. The external quantum efficiency is 38.5 CD / A 27.3 lm / W and 15.2mm / W, respectively.) the simple structure of single molecular white light device. F monolayer device has a current efficiency of 0.79 cdA / r and a power efficiency of 0.73 lm / W, which is synthesized by using a small molecule FFFF and a polymer PF with vinyl fluorene aniline as the center. The external quantum efficiency is 0.6, the color coordinate is 0.32 / 0.33 / FF, the current efficiency is 1.75 cd/ A, the power efficiency is 1.61 lm / r, the outer quantum efficiency is 1.3x, the color coordinate is 0.260.30 / PF, the current efficiency is 4.5 cdp / A, the power efficiency is 4.2 lm / Wand, the outer quantum efficiency is 2.6, and the color coordinate is 0.320.30.
【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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