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Enhancement of current-voltage characteristics of multilayer organic light emitting diodes by using nanostructured composite films

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Enhancement of current-voltage characteristics of multilayer organic light emitting diodes by using nanostructured composite films

Dinh, Nguyen Nang and Chi, Le Ha and Chung Thuy, Tran Thi and Trung, Tran Quang and Truong, Vo-Van (2009) Enhancement of current-voltage characteristics of multilayer organic light emitting diodes by using nanostructured composite films. Journal of Applied Physics, 105 (9). ISSN 00218979

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Official URL: http://dx.doi.org/10.1063/1.3117518

Abstract

With the aim of improving the photonic efficiency of an organic light emitting diode (OLED) and its display duration, both the hole transport layer (HTL) and the emitting layer (EL) were prepared as nanostructured thin films. For the HTL, nanocomposite films were prepared by spin-coating a homogeneous solution of low molecular weight poly(4-styrenesulfonate) (PEDOT-PSS) and surfactant-capped TiO2 nanocrystals onto low resistivity indium tin oxide (ITO) substrates; for the EL, nancrystalline titatium oxide (nc-TiO2)-embedded Poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV+nc-TiO2) conjugate polymers were spin-coated onto the HTL. Also, for a shallow contact of Al/LiF/MEH-PPV instead of Al/MEH-PPV a super LiF thin film was deposited onto the EL by vacuum evaporation. The resulting multilayer OLED had the following structure of Al/LiF/MEH-PPV+nc-TiO2/PEDOT-PSS+nc-TiO2/ITO. Characterization of the nanocomposite films showed that both the current-voltage (I-V) characteristics and the photoluminescent properties of the nanocomposite materials were significantly enhanced in comparison with the standard polymers. OLEDs made from these layers would exhibit a large photonic efficiency.

Divisions:Concordia University > Faculty of Arts and Science > Physics
Item Type:Article
Refereed:Yes
Authors:Dinh, Nguyen Nang and Chi, Le Ha and Chung Thuy, Tran Thi and Trung, Tran Quang and Truong, Vo-Van
Journal or Publication:Journal of Applied Physics
Date:2009
ID Code:974569
Deposited By:KATHARINE HALL
Deposited On:17 Aug 2012 12:28
Last Modified:19 Feb 2014 11:44
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