Title:
Highly efficient green phosphorescent organic light-emitting diodes with simplified device geometry

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Haldi, Andreas
Domercq, Benoit
Kippelen, Bernard
Hreha, R. D.
Cho, Jian-Yang
Marder, Seth R.
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Abstract
We report on the performance of green phosphorescent organic light-emitting diodes based on the well-known host 4,4′-di(carbazol-9-yl)-biphenyl and the green phosphor emitter fac tris(2-phenylpyridinato-N,C²′) iridium. Using a spin-coated hole-injection/transport layer of poly(N-vinyl-carbazole) and a hole-blocking/electron-transport layer of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, devices with efficiencies of 21.2% and 72 cd/A at 100 cd/m² were obtained in a simplified device geometry that requires the deposition of only two organic layers from the vapor phase.
(c) 2008 American Institute of Physics.
DOI: 10.1063/1.2952452
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2008-06
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