Applied Physics Letters, 7 January 2008
Appl. Phys. Lett. 92, 013303 (2008) (3 pages)
©2008 American Institute of Physics. All rights reserved. 
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Extraction enhancement in organic light emitting devices by using metallic nanowire arrays
Shen-Yu Hsu and Ming-Chang Lee
Institute of Photonics Technologies, National Tsing Hua University, Hsinchu 30055, Taiwan
Kuang-Li Lee
Department of Electrical Engineering and Graduate Institute of Electro-Optical Engineering, National Taiwan University, Taipei 10617, Taiwan
Pei-Kuen Wei(a)
Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan and Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung 20224, Taiwan
(Received: 14 September 2007; accepted: 3 December 2007; published online: 4 January 2008)The extraction efficiency of organic light emitting devices is enhanced by depositing metallic nanowires on the glass surface and indium tin oxide (ITO) anode. For the aluminum tris-(8-hydroxyquinoline) (Alq3) based devices, a 100 nm-width and 450 nm-period gold nanowire array increases light extraction up to 46% from glass substrate and 80% from the organic layer. Such metallic nanowire arrays double the brightness with small absorption, only 10% lower than ITO glass. In addition, colors of the devices can be selected by the period of nanowire array. We demonstrated blue to red light emission by using single Alq3-based device. ©2008 American Institute of Physics
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