Characteristics of White Organic Light-Emitting Diodes Using Heteroleptic Iridium Complexes for Green and Red Phosphorescence
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概要
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We have demonstrated red-green-blue emissive white organic light-emitting diodes (RGB-WOLEDs) by using two emissive materials as dopant, 4,4$'$-bis(9-ethyl-3-carbazovinylene)-1,1$'$-biphenyl (BCzVBi) and heteroleptic tris-cyclometalated iridium(III) complexes. It was found that the heteroleptic iridium complexes, bis(2-phenylquinoline)(2-p-tolylpyridine) iridium(III) [Ir(pq)2(tpy)] and bis(2-p-tolylpyridine)(2-phenylquinoline) iridium(III) [Ir(tpy)2(pq)], used in this study showed double emissive colors, where the pq and tpy ligands emitted red and green colors, respectively. The luminance–voltage ($L$–$V$) characteristics of the RGB-WOLEDs using the Ir(tpy)2(pq) showed a luminance of 9630 cd/m2 at 14 V and a maximum luminous efficiency of 12.9 cd/A. The CIEx,y coordinates also showed ($x=0.31$, $y=0.36$) at 12 V.
- 2008-08-25
著者
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Kim In
Department Of Animal Resource And Sciences Dankook University
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Kim Young
Department Of Agricultural Chemistry The University Of Tokyo
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Seo Ji
Department of Information Display Engineering, Hong-ik University, Seoul 121-791, Korea
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Kim Young
Department of Information Display, Hongik University, Seoul 121-791, Korea
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