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Proceedings Paper

Highly efficient green phosphorescent organic light-emitting diodes with hybrid device geometry
Author(s): Andreas Haldi; Benoit Domercq; Asha Sharma; Richard D. Hreha; Jian-Yang Cho; Seth R. Marder; Bernard Kippelen
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Paper Abstract

We report on the performance of green phosphorescent organic light-emitting diodes (OLEDs) based on the well-known device structure of a hole-transport layer, an emissive layer with host 4,4'-di(carbazol-9-yl)-biphenyl [CBP] and the green phosphor emitter fac tris(2-phenylpyridinato-N,C2,) iridium [Ir(ppy)3], a hole-blocking layer of 2,9-dimethyl-4,7- diphenyl-1,10-phenanthroline [BCP] and and tris-(8-hydroxyquinolinato-N,O) aluminum [Alq3] as an electron-transport layer. Using spin-coated hole-injection/transport layers with increasing ionization potentials and decreasing hole mobilities, external quantum efficiencies of up to 18.1% at 100 cd/m2 were measured in such devices. Furthermore, by removing the electron-transport layer of Alq3 and increasing the thickness of BCP, devices with efficiencies of 21.2% and 72 cd/A at 100 cd/m2 were obtained. Achieving such high efficiencies with a simplified hybrid structure in which one layer is processed from solution and only two other organic layers are deposited from the vapor phase is desirable for the fabrication of low-cost OLEDs.

Paper Details

Date Published: 2 September 2008
PDF: 10 pages
Proc. SPIE 7051, Organic Light Emitting Materials and Devices XII, 70510B (2 September 2008); doi: 10.1117/12.795363
Show Author Affiliations
Andreas Haldi, Georgia Institute of Technology (United States)
Benoit Domercq, Georgia Institute of Technology (United States)
Asha Sharma, Georgia Institute of Technology (United States)
Richard D. Hreha, Univ. of Arizona (United States)
Jian-Yang Cho, Georgia Institute of Technology (United States)
Seth R. Marder, Georgia Institute of Technology (United States)
Bernard Kippelen, Georgia Institute of Technology (United States)


Published in SPIE Proceedings Vol. 7051:
Organic Light Emitting Materials and Devices XII
Franky So; Chihaya Adachi, Editor(s)

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