Sodium stearate, an effective amphiphilic molecule buffer material between organic and metal layers in organic light-emitting devices

Zhan, Yiqiang; Xiong, Zuhong; Shi, Hongqin; Zhang, S. T.; Xu, Zheng; Zhong, Gaoyu; He, Jun; Zhao, Jingru; Wang, Z. J.; Obbard, E.G.; Ding, H.J.; Wang, X. J.; Ding, Xinyi; Huang, Wei; Hou, X. Y.

doi:10.1063/1.1601675

Cited by 42 publications

(15 citation statements)

References 21 publications

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“…ITO coated glass with a sheet resistance of 30 X/ square is used as the substrate and the anode. The routine ITO glass substrate treatments, device fabrication and characteristic measurements used in the present letter have been described elsewhere [19].…”

Section: Methodsmentioning

confidence: 99%

Non-doped red emission: A solution for bias-independent red emission

Zhan

Zhou

et al. 2008

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Section: Methodsmentioning

confidence: 99%

Non-doped red emission: A solution for bias-independent red emission

Zhan

Zhou

et al. 2008

Displays

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“…이 밖에도 Al 전극과 유기층의 계면에 metal fluorides(LiF [3], NaF [10], CsF [11]), metal oxides(MgO [12], Al 2 O 3 [13]), organic metal complexes (Ca(acac) 2 [14], NaSt [15] …”

Section: 에서 전자주입 특성을 향상시키는 소재로 널리 사용되고 있다 박막의unclassified

Effects of Low Workfunction Metal Acetate Layers on the Electroluminescent Characteristics of Organic Light-Emitting Diodes

Kim¹,

Yu²,

Kim³

2013

Korean Chemical Engineering Research

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-We investigated the effects of a cathode underlayer on the electroluminescence (EL) characteristics of organic light-emitting diodes (OLEDs) using various metal acetates (M-acetate, M = Li, Na, K, Cs) as a cathode underlayer. When 1 nm thick M-acetate layers were used as a cathode underlayer, the OLEDs with M-acetate showed better EL performance than the device with the conventional LiF electron injection layer except the device with Cs-acetate. More enhanced current density and improved EL characteristics were obtained when lower work function metal acetate was employed. In addition, the optimum M-acetate layer thickness that gives the best device performance proved to be 0.7 and 2.0 nm for Li-acetate and Cs-acetate, respectively, probably depending on the molecular size of M-acetate. The OLEDs with the M-acetate layers of optimized thickness demonstrated more than 60% enhanced current efficiency compared with that of the device using an LiF layer at the same applied voltage.

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“…Inorganic insulator buffer layers, such as LiF [7][8][9], Al 2 O 3 [10], SiO 2 [11], H f O x [12], MoO 3 [13] and WO 2.5 [14] were also widely used. Some experiments showed higher current efficiency [9,11,12] and others showed higher power efficiency [10,13,15].…”

Section: Introductionmentioning

confidence: 96%

Tunneling effect on enhanced OLED performance using Al<inf>2</inf>O<inf>3</inf> buffer layer

Cui

2013

The 8th Annual IEEE International Conference on Nano/Micro Engineered and Molecular Systems

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It has been found that introduction of buffer layers between organic holes transport layer and anode layer plays an important role in improving device stability and hole injection efficiency of organic light-emitting diodes (OLED). As for the mechanism of the improvement due to the buffer layer, it is still controversial. To understand the mechanism behind the enhanced performance of OLED by the buffer layer, a new model is therefore proposed which combines classical model and quantum tunneling model to explain the OLED performance improvement. A thin Al 2 O 3 insulating buffer layer deposited on indium tin oxide (ITO) anode by atomic layer deposition has been investigated for OLED. The observed power efficiency and current efficiency improvement at the optimal thickness of 1.4 nm are well explained by the model. A series of Al 2 O 3 films of different thicknesses were deposited on ITO anode and characterized. Their roughness, sheet resistance, surface potential, and resulted OLED current density were investigated. It is believed that the blocking of hole inject by the Al 2 O 3 buffer layer makes more balanced carrier density in emission layer, thus enhances the current efficiency. Though less number of holes are injected in OLED due to the insertion of Al 2 O 3 layer, quantum tunneling through the ultra-thin buffer layer play an important role to contribute to the hole injection, which avoids crossing the interface barrier, resulting in less energy consumed and power efficiency enhanced.Keywords-both current and power efficiency improvement; new model; hole injection mechanism; quantum tunneling; thermionic emission

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Sodium stearate, an effective amphiphilic molecule buffer material between organic and metal layers in organic light-emitting devices

Cited by 42 publications

References 21 publications

Non-doped red emission: A solution for bias-independent red emission

Non-doped red emission: A solution for bias-independent red emission

Effects of Low Workfunction Metal Acetate Layers on the Electroluminescent Characteristics of Organic Light-Emitting Diodes

Tunneling effect on enhanced OLED performance using Al<inf>2</inf>O<inf>3</inf> buffer layer

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