液晶与显示, 2014, 29 (6): 886, 网络出版: 2014-09-15   

基于LiF/Al/F4-TCNQ/NPB电荷产生层的叠层有机电致发光器件的特性研究

Characteristic of tandem organic light emitting diodes with charge generation layer of LiF/Al/F4-TCNQ/NPB
景姝 1,2,*王华 1,2刘慧慧 1,2杜晓刚 1,2苗艳勤 1,2潘成龙 1,2周禾丰 1,3
作者单位
1 太原理工大学 新材料界面科学与工程教育部重点实验室,山西 太原 030024
2 太原理工大学 新材料工程技术研究中心,山西 太原 030024
3 太原理工大学 材料科学与工程学院,山西 太原 030024
摘要
采用结构为LiF/Al/F4-TCNQ/NPB的电荷产生层,制备出了双发光单元叠层有机电致发光器件(OLED: Organic Light Emitting Device)。通过对比实验发现当F4TCNQ层的厚度为8 nm、Al层的厚度为5 nm时,电荷产生层产生电荷的能力较强且具有良好的透光率。基于此,本文制备了发光层为CBP:6%Ir(ppy)3的叠层OLED,通过与单发光单元OLED的性能比较发现: 采用LiF/Al/F4TCNQ/NPB作为电荷产生层制备的叠层OLED的最大电流效率与功率效率分别为516 cd/A、284 lm/W,为单发光单元OLED的216倍、18倍,此外采用这种结构的电荷产生层有效解决了叠层OLED由于工作电压高而导致功率效率并未得到提升的问题[另一方面,采用有机材料F4TCNQ代替传统无机金属氧化物作为电荷产生层中的电荷产生部分,能够避免无机金属氧化物高温升华对Al层薄膜的破坏,提升了器件的效率并且降低了器件的roll-off现象。
Abstract
A novel type of tandem organic light emitting device (OLED) was demonstrated by employing LiF/Al/F4-TCNQ/NPB as charge generation layer (CGL). By contrast experiment, it is suggested that the optimum thickness of F4TCNQ and Al in CGL is 8 nm and 5 nm, respectively, which exhibits the good ability of generating charges and higher optical transmittance.Based on the optimized structure of CGL, we fabricated the tandem OLED with the emission layer of CBP:6%Ir(ppy)3. By comparing the device performance of the tandem OLED and conventional single OLED, it was found that the highest current efficiency and power efficiency were 516 cd/A and 284 lm/W, which was 216 times and 18 times as high as that of single OLED, respectively.In conclusion, the tandem OLED with the CGL of LiF/Al/F4TCNQ/NPB can improve the power efficiency of OLED. In addition, replacing conventional inorganic metal oxide with organic material of F4TCNQ in CGL can avoid the destruction of film formation of Al layer, inducing in improving in performance and weakening the efficiency rolloff phenomenon.

景姝, 王华, 刘慧慧, 杜晓刚, 苗艳勤, 潘成龙, 周禾丰. 基于LiF/Al/F4-TCNQ/NPB电荷产生层的叠层有机电致发光器件的特性研究[J]. 液晶与显示, 2014, 29(6): 886. JING Shu, WANG Hua, LIU Huihui, DU Xiaogang, MIAO Yanqin, PAN Chenglong, ZHOU Hefeng. Characteristic of tandem organic light emitting diodes with charge generation layer of LiF/Al/F4-TCNQ/NPB[J]. Chinese Journal of Liquid Crystals and Displays, 2014, 29(6): 886.

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