电荷生成层中引入超薄金属Ag层对串联有机发光二极管性能的提升

发布时间：2018-05-21 16:02

本文选题：有机电致发光器件 + 串联　；参考：《物理学报》2017年01期

【摘要】：为了获得高效、长寿命的白光有机发光二极管(white organic light-emitting diode,WOLED),一种方法是将不同颜色的发光单元通过电荷生成层(charge generation layer,CGL)串联起来获得白光,即串联WOLED.其中,CGL的选择与设计是高性能串联白光器件的关键.本文首先从绿光OLED着手,通过在CGL层中引入超薄的Ag金属层,获得了高效、长寿命的串联器件.引入超薄Ag金属层的绿光串联OLED的最大亮度达到了290000 cd/m~2,分别是单层器件和无超薄Ag金属层器件的2.9倍与2.4倍;在1000 cd/m~2下,引入超薄Ag金属层的器件电流效率达到了59.5 cd/A,相比于无超薄金属层的串联器件的58.7 cd/A,以及非串联的单层器件的17.1 cd/A,分别增加了1.4%与248%;同时,与无超薄层的串联器件相比,引入超薄Ag金属层的器件工作电压从8.6 V降为7.2 V;功率效率从21.5 lm/W上升为26 lm/W.特别地,在初始测试亮度为10000 cd/m~2的条件下,包含超薄Ag金属层的串联器件的工作寿命T80超过了250 h,与无超薄层串联器件仅2.7 h寿命相比,提高近100倍.最后,我们使用优化后的CGL制备出高性能串联WOLED,在1000 cd/m~2下,电流效率达到了75.9 cd/A,功率效率达到了36.1 lm/W,且10000 cd/m~2的初始亮度下T80有77 h.这些优异的器件性能归结于超薄金属层的引入,抑制了Bphen:Cs CO_3与HAT-CN在界面处的相互扩散,同时也促进了载流子的生成与传输.这一结果为设计高效且稳定的WOLED提供了有效的思路.
[Abstract]:In order to obtain high efficiency and long lifetime white organic light-emitting diodes, one method is to series different color luminescent cells through charge generation layer CGL to obtain white light, that is, series WOLED. The selection and design of CGL is the key of high performance series white light device. In this paper, a series device with high efficiency and long life is obtained by introducing ultra-thin Ag metal layer into the CGL layer from the green OLED. The maximum luminance of green light series OLED with ultra-thin Ag metal layer is 290000 CD / m ~ (2), which is 2.9 times and 2.4 times of that of single layer device and non-thin Ag metal layer device, respectively, and at 1000 cd/m~2, the maximum brightness of green light series OLED is 290000 CD / m ~ (2), respectively. The current efficiency of the device with the introduction of ultra-thin Ag metal layer has reached 59.5 CD / A, compared with 58.7 CD / A of the series device without the ultra-thin metal layer and 17.1 CD / A of the non-series monolayer device, the current efficiency of the device increased by 1.4% and 248%, respectively, and compared with the series device without the ultra-thin layer, The operating voltage of the device with ultra-thin Ag layer decreases from 8.6 V to 7.2V, and the power efficiency increases from 21.5 lm/W to 26lm / W. In particular, under the initial test brightness of 10000 cd/m~2, the working life of the series device containing ultra-thin Ag layer is more than 250h, which is nearly 100 times higher than that of the non-thin-layer series device with only 2.7h. Finally, we use optimized CGL to prepare series WOLED with high performance. At 1000 cd/m~2, the current efficiency is 75.9 cdr / A, the power efficiency is 36.1 lm / Wand the initial brightness of 10000 cd/m~2 is 77 h. The excellent performance of these devices is attributed to the introduction of ultra-thin metal layers, which inhibits the interdiffusion of Bphen:Cs CO_3 and HAT-CN at the interface, and also promotes the generation and transport of carriers. This result provides an effective way to design an efficient and stable WOLED.
【作者单位】：华南理工大学发光材料与器件国家重点实验室高分子光电材料与器件研究所;广州新视界光电科技有限公司;
【基金】：国家重点基础研究发展规划(批准号:2015CB655004) 国家自然科学基金(批准号:61574061,61574062) 广东省科技计划(批准号:2014B090916002,2015B090915001,2015B090914003) 广东省特支计划科技创新青年拔尖人才项目(批准号:2014TQ01C321) 中国博士后科研基金(批准号:2015M582380,2016M590779) 广州市珠江科技新星专项(批准号:201506010015,201505051412482)资助的课题~~
【分类号】：TN383.1

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