Highly efficient green phosphorescent organic light-emitting diodes with hybrid device geometry

Andreas Haldi; Benoit Domercq; Asha Sharma; Richard D. Hreha; Jian-Yang Cho; Seth R. Marder; Bernard Kippelen

doi:10.1117/12.795363

2 September 2008 Highly efficient green phosphorescent organic light-emitting diodes with hybrid device geometry

Andreas Haldi, Benoit Domercq, Asha Sharma, Richard D. Hreha, Jian-Yang Cho, Seth R. Marder, Bernard Kippelen

Proceedings Volume 7051, Organic Light Emitting Materials and Devices XII; 70510B (2008) https://doi.org/10.1117/12.795363
Event: Photonic Devices + Applications, 2008, San Diego, California, United States

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,C^2,) 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.

Citation Download Citation

Andreas Haldi, Benoit Domercq, Asha Sharma, Richard D. Hreha, Jian-Yang Cho, Seth R. Marder, and Bernard Kippelen "Highly efficient green phosphorescent organic light-emitting diodes with hybrid device geometry", Proc. SPIE 7051, Organic Light Emitting Materials and Devices XII, 70510B (2 September 2008); https://doi.org/10.1117/12.795363

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