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.
参考文献

[1] Kido J, Matsumoto T, Nakada T,et al.High efficiency organic EL devices having charge generation layers[J].SID Int.Symp.Dig.Tech.,2003, 34(1): 964-965.

[2] 朱海娜,徐征,郑宁.利用多周期量子阱结构提高有机发光二极管的效率[J].液晶与显示,2013,28(2): 188-193.

    Zhu H N,Xu : ,Zheng N. Enhancing the efficiency of organic light emitting diode by using multiperiod quantum well structrue[J]. Chinese Journal of Liquid Crystals and Displays,2013, 28(2): 188-193. (in Chinese)

[3] 黄晋,张方辉,张微.绿红双发光层有机电致磷光器件的载流子调控研究[J].液晶与显示,2014,29(1): 22-27.

    Huang J, Zhang F H, Zhang W. Regulation of carriers in double organic electroluminescent phosphorescent emitting layer(green and red)[J].Chinese Journal of Liquid Crystals and Displays,2014, 29(1): 22-27. (in Chinese)

[4] Zhang H M, Wallace C H, Dai Y F,et al.The structural composite effect of AuWO3Al interconnecting electrode on performance of each unit in stacked OLEDs[J].Organic Electronics,2009, 10: 402-407.

[5] 陈永华,马东阁.有机半导体异质结电荷产生层及其在叠层有机发光二极管中的应用[J].中国科学通报,2011, 56(24): 1947-1955.

    Chen Y H, Ma D G. Organic semiconductor heterojunction charge generation layer and its application in tandem organic lightemitting diodes[J].Chinese Sci Bull (Chinese Ver),2011, 56(24): 1947-1955.(in Chinese)

[6] Wang Q, Chen Y H, Chen J S,et al.White topemitting organic lightemitting diodes employing tandem structure[J].Appl.Phys.Lett.,2012, 101(13): 133302.

[7] 王摇丽, 吴晓明, 华玉林.插入电荷控制层对蓝色OLED 发光性能的提高[J].发光学报,2014,35(1): 84-89.

    Wang L, Wu X M, Hua Y L.Improvement of performance of a blue organic lightemitting diode by inserting charge control layers[J].Chinese Journal of Luminescence,2014, 35(1): 84-89. (in Chinese)

[8] 袁桃利, 张方辉,张微.空穴传输层对有机电致发光器件性能的影响[J].发光学报,2013,34(11): 1457-1461.

    Yuan T L, Zhang F H, Zhang W.The electroluminescent performance of OLED based on different hole transport layer[J].Chinese Journal of Luminescence,2013, 34(11): 1457-1461.(in Chinese)

[9] Kanno H, Holmes R J, Sun Y,et al.White stacked electrophosphorescent organic lightemitting devices employing MoO3 as a chargegeneration layer[J].Adv. Mater.,2006, 18(3): 339-342.

[10] Chang C C, Hwang S W, Chen C H,et al.Highefficiency organic electroluminescent device with multiple emitting units[J]. Jpn· J· Appl· Phys· ,2004, 43: 6418-6422.

[11] Matsumoto T, Nakada T, Endo J,et al.Multiphoton organic EL device having charge generation layer[J].SID Int.Symp.Dig.Tech.,2003, 34(1):979-981.

[12] Lee H D, Lee S J, Lee K Y,et al.High efficiency tandem organic lightemitting diodes using interconnecting layer[J].Jpn.J.Appl.Phys.,2009,48:082101.

[13] Liao L S, Slusarek W K, Hatwar T K,et al.Tandem organic lightemitting mode using hexaazatriphenylene hexacarbonitrile in the intermediate connector[J].Adv. Mater.,2008, 20(2): 324-329.

[14] Liao L S, Klubek K P, Tang C W. Highefficiency tandem organic lightemitting diodes[J].Appl.Phys.Lett.,2004,84(2): 167-169.

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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