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1. 上海大学 新型显示技术与应用集成教育部重点实验室 上海,200072
2. 上海大学 机电工程与自动化学院 上海,200072
3. 上海大学 材料学院 上海,200072
纸质出版日期:2012-6-10,
网络出版日期:2012-6-10,
收稿日期:2012-3-9,
修回日期:2012-4-23,
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张浩, 王立, 容佳玲, 曹进, 张志林, 蒋雪茵, 张建华. 碳酸铯修饰Al作为反射阴极的倒置顶发射OLED器件[J]. 发光学报, 2012,(6): 611-615
ZHANG Hao, WANG Li, RONG Jia-Ling, CAO Jin, ZHANG Zhi-Lin, JIANG Xue-Yin, ZHANG Jian-Hua. Efficient Inverted Top-emitting Organic Light-emitting Devices with Cesium Carbonate Modified Al Cathode[J]. Chinese Journal of Luminescence, 2012,(6): 611-615
张浩, 王立, 容佳玲, 曹进, 张志林, 蒋雪茵, 张建华. 碳酸铯修饰Al作为反射阴极的倒置顶发射OLED器件[J]. 发光学报, 2012,(6): 611-615 DOI: 10.3788/fgxb20123306.0611.
ZHANG Hao, WANG Li, RONG Jia-Ling, CAO Jin, ZHANG Zhi-Lin, JIANG Xue-Yin, ZHANG Jian-Hua. Efficient Inverted Top-emitting Organic Light-emitting Devices with Cesium Carbonate Modified Al Cathode[J]. Chinese Journal of Luminescence, 2012,(6): 611-615 DOI: 10.3788/fgxb20123306.0611.
以Cs
2
CO
3
修饰的Al电极作为反射阴极制备了高效倒置顶发射结构有机电致发光器件(ITOLED)。以八羟基喹啉铝(Alq
3
)作为发光层、MoO
3
修饰的Ag为半透明阳极时
器件的开启电压为3.6 V
发光效率和功率效率分别达到9.8 cd/A和3.4 lm/W。研究结果表明
Al/Cs
2
CO
3
为反射阴极的器件性能明显高于使用Mg:Ag(4.2 V
8.6 cd/A
2.85 lm/W)和Al(5 V
5.5 cd/A
1.57 lm/W)作为反射阴极的倒置顶发射OLED器件。单电子器件研究结果证明
以Cs
2
CO
3
修饰的Al电极功函数明显低于Mg:Ag和Al电极
具有更好的电子注入效果。因此
除去微腔效应外
Al/Cs
2
CO
3
为反射电极的ITOLED器件性能的提高主要归因于Al/Cs
2
CO
3
阴极的有效电子注入。
Efficient inverted top-emitting organic light-emitting diode(ITOLED) using a thin Cs
2
CO
3
layer modified Al as the reflective bottom cathode is demonstrated. With tris-(8-hydroxy-quinoline) aluminum (Alq
3
) as emitting layer and MoO
3
/Ag as semitransparent anode
the Al/Cs
2
CO
3
based ITOLED shows a tune-on voltage of 3.6 V
luminance efficiency of 9.8 cd/A and 3.4 lm/W
which are much better than those (4.2 V
8.6 cd/A
2.85 lm/W) obtained from Mg:Ag based ITOLED and those (5 V
5.5 cd/A
1.57 lm/W) obtained from bare Al based ITOLED. Electron-only devices research shows that a stronger electron-injection is obtained from Al/Cs
2
CO
3
than Mg:Ag and Al
which is attributed to the lower work function of Al/Cs
2
CO
3
than Mg:Ag and Al. The good performance of Al/Cs
2
CO
3
based ITOLED is attributed to the efficient electron injection from the Al/Cs
2
CO
3
cathode as well as a microcavity effect.
有机电致发光Cs2CO3倒置顶发射电子注入
OLEDCs2CO3inverted top-emittingelectron injection
Tang C W, Van Slyke S. Organic electroluminescent diodes [J]. Appl. Phys. Lett., 1987, 51(9):913-915.[2] Chen S Y, Chu T Y, Chen J F, et al. Stable inverted bottom-emitting organic electroluminescent devices with molecular doping and morphology improvement [J]. Appl. Phys. Lett., 2006, 89(5):053518-1-3.[3] Lee Y, Kim J, Kwon S, et al. Interface studies of aluminum,8-hydroxyquinolatolithium (Liq) and Alq3 for inverted OLED application [J]. Org. Electron., 2008, 9(3):407-412.[4] Meyer J, Winkler T, Hamwi S, et al. Transparent inverted organic light-emitting diodes with a tungsten oxide buffer layer [J]. Adv. Mater., 2008, 20(20):3839-3843.[5] Wang Q, Deng Z Q, Chen J S, et al. Manipulating the microcavity structure for highly efficient inverted top-emitting organic light-emitting diodes:Simulation and experiment [J]. IEEE Trans. Electron Devices, 2010, 57(9):2221-2226.[6] Wang Z K, Lou Y H, Naka S, et al. High efficiency rubrene based inverted top-emission organic light emitting devices with a mixed single layer [J]. J. Lumin., 2010, 130(7):1198-1202.[7] Li Y, Zhang D Q, Duan L, et al. Elucidation of the electron injection mechanism of evaporated cesium carbonate cathode interlayer for organic light-emitting diodes [J]. Appl. Phys. Lett., 2007, 90(1):012119-1-3.[8] Chen M H, Wu C I. The roles of thermally evaporated cesium carbonate to enhance the electron injection in organic light emitting devices [J]. J. Appl. Phys., 2008, 104(11):113713-1-3.[9] Huang J, Xu Z, Yang Y. Low-work-function surface formed by solution-processed and thermally deposited nanoscale layers of cesium carbonate [J]. Adv. Funct. Mater., 2007, 17(12):1966-1973.[10] Wu C I, Lin C T, Chen Y H. Electronic structures and electron-injection mechanisms of cesium-carbonate-incorporated cathode structures for organic light-emitting devices [J]. Appl. Phys. Lett., 2006, 88(15):152104-1-3.[11] Liu Aihua, Yang Liying. Improved performance of organic light emitting diodes using combined hole-injecting layer [J]. Chin. J. Lumin.(发光学报), 2012, 33(4):422-427 (in Chinese).[12] Lin Wenjing, Su Wenming, Zhang Dongyu, et al. Properties improvement of polymer white organic light emitting devices by phosphorescence sensitizer [J]. Chin. J. Lumin.(发光学报), 2012, 33(4):440-443 (in Chinese).[13] Cai Y, Wei H X, Li J, et al. Mechanism of Cs2CO3 as an n-type dopant in organic electron-transport film [J]. Appl. Phys. Lett., 2011, 98(11):113304-1-3.[14] Cho H, Choi J M, Yoo S. Highly transparent organic light-emitting diodes with a metallic top electrode:The dual role of a Cs2CO3 layer [J]. Opt. Express, 2011, 19(2):1113-1121.[15] Lian J R, Liu Y W, Niu F F, et al. Improved electron injection of OLEDs with a thin PBD layer at Alq3/Cs2CO3 interface [J]. Appl. Surf. Sci., 2011, 257(10):4608-4611.[16] Lin C L, Lin H W, Wu C C. Examining microcavity organic light-emitting devices having two metal mirrors [J]. Appl. Phys. Lett., 2005, 87(2):021101-1-3.[17] Lee C J, Pode R B, Moon D G, et al. On the problem of microcavity effects on the top emitting OLED with semitransparent metal cathode [J]. Phys. Stat. Sol.(a), 2004, 201(5):1022-1028.
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