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陕西科技大学 电气与信息工程学院,陕西 西安,710021
收稿日期:2011-08-10,
修回日期:2011-09-06,
网络出版日期:2012-02-15,
纸质出版日期:2012-02-15
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梁田静, 张方辉, 丁磊. 多层氧化物复合阴极透明OLED器件[J]. 液晶与显示, 2012,27(1): 43-46
LIANG Tian-jing, ZHANG Fang-hai, DING Lei. Transparent Organic Light Emitting Diodes Using a Multilayer Oxide as a Composite Cathode[J]. , 2012,27(1): 43-46
制备了一种采用多层氧化物复合阴极的透明OLED
器件结构为:ITO/ MoO
3
(10 nm) /NPB(60 nm)/Alq
3
(65 nm)/ Al(1 nm)/ MoO
3
(1 nm)/Al(
X
nm) /MoO
3
(30 nm)。所采用的复合阴极结构为MoO
3
/Al/ MoO
3
(MAM)
同时在复合阴极(MAM)与电子传输层(Alq
3
)中间插入一层厚度为1 nm的Al中间层
该薄Al层一方面提高了电极与有机层间界面的平整度
同时增强了电极的导电性;另一方面
在电子传输层与中间层Al薄膜之间形成了良好的欧姆接触
提高了电子的注入能力。改变MAM结构中Al的厚度
获得该透明OLEDs的最佳性能
在Al的厚度为18 nm时器件亮度最高
为2 297 cd/cm
2
。
Transparent organic light emitting diodes are developed by using a multilayer oxide as a composite cathode. The device structure is ITO/ MoO
3
(10 nm)/NPB(60 nm)/Alq
3
(65 nm)/Al(1 nm)/MoO
3
(1 nm)/Al(
X
nm) /MoO
3
(30 nm). The composite cathode is MoO
3
/Al/MoO
3
(MAM). A thin Al layer (1 nm) was introduced as an interlayer between the Alq
3
electron transport layer and the MAM electrode. On the one hand
the thin Al layer improves the interface flatness between electrode and organic layers
while improving the conductivity of the electrode. On the other hand
electron injection was greatly improved by forming an Ohmic contact between the electron transport layer and a thin Al layer. Then the OLEDs optimum performance is obtained by changing the thickness of Al in MAM. With the Al thickness of 18 nm
the highest brightness 2 297cd/cm
2
is obtained.
Lai L S, Chan M Y, Fung M K, et al. Applications of ytterbium in organic light-emitting devices as high perfor-mance and transparent electrodes[J]. Chem. Phys. Lett., 2002, 366(1-2):128-133.[2] 李红霞, 刘宏, 王继扬, 等. 氧化物透明导电膜的研究进展[J]. 功能材料, 2004, 35(z1):1091-1093.[3] 熊祖洪, 史华忠, 樊永良, 等. 电致发光色纯性增强的硅基有机微腔[J]. 物理学报, 2003, 52(5):1222-1229.[4] Kim S Y, Moon D G, Lee C J. Sr/Ag semitransparent cathodes for top emission organic light-emitting devices [J].Thin Solid Films, 2009, 517(6): 2035-2038.[5] Lee C J, Pode R B, Han J I, et al. Red electrophosphorescent top emission organic light-emitting device With Ca/Ag semitransparent cathode [J]. Appl. Phys. Lett., 2006, 89(25):253508(1-3).[6] Lee C J, Pode R B, Han J I, et al. Green top-emitting organic light-emitting device with transparent Ba/Ag bilayer cathode [J]. Appl. Phys. Lett., 2006, 89(12):12350(1-3).[7] Daeil Kim. Low temperature deposition of transparent conducting ITO/Au/ITO films by reactive magnetron sputtering [J]. Appl. Surface Science, 2010, 256(6):1774-1777.[8] Choi J I, Lee J Y, Park J H, et al. Fabrication and characterization of Pt intermediate transparent and conducting ITO/Pt/ITO multilayer films [J]. J. Phys. and Chem. of Solids, 2009,70(2):272-275.[9] Sahu D R, Huang Jow-Lay. The properties of ZnO/Cu/ZnO multilayer films before and after annealing in the different atmosphere[J].Thin Solid Films, 2007, 516(2-4):208-211.[10] 席俭飞,张方辉,马颖,等.钙铝合金作为阴极对OLED器件性能的影响[J]. 液晶与显示, 2010,25(3):355-359.[11] Yook Kyoung Soo, Jeon Soon Ok, Joo Chul Woong,et al. Transparent organic light-emitting diodes using a multilayer oxide as a low resistance transparent cathode[J]. Appl. Phys. Lett., 2008, 93(1),013301(1-3).
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