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Applied Physics Letters / Volume 90 / Issue 2 / DEVICE PHYSICS

Appl. Phys. Lett. 90, 023506 (2007); doi:10.1063/1.2430926 (3 pages)

Highly efficient near-infrared organic excimer electrophosphorescent diodes

M. Cocchi1, D. Virgili1, V. Fattori1, J. A. G. Williams2, and J. Kalinowski3

1Institute of Organic Synthesis and Photoreactivity, National Research Council of Italy (ISOF-CNR), I-40129 Bologna, Italy
2Department of Chemistry, University of Durham, Durham DH1 3LE, United Kingdom
3Department of Molecular Physics, Gdańsk University of Technology, 80-952 Gdańsk, Poland

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(Received 18 October 2006; accepted 5 December 2006; published online 11 January 2007)

The authors report the fabrication of very high efficiency near-infrared (NIR) organic light-emitting diodes (LEDs) based on a series of terdentate cyclometallated phosphorescent Pt(II) complexes PtLCl as the emitting layer. The LEDs exhibit exclusive NIR excimeric phosphorescence peaking between 705 and 720 nm for three different organic ligands (L). Due to the high excimer emission quantum yields of these Pt complexes and to confinement of the recombination zone within the emission layer, unusually high external quantum efficiencies from 9.8% to 10.7% photons/electron and a high forward light output exceeding 15 mW/cm2 were achieved.

© 2007 American Institute of Physics

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KEYWORDS and PACS

Keywords

organic light emitting diodes, phosphorescence

PACS

ARTICLE DATA

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http://link.aip.org/link/doi/10.1063/1.2430926

PUBLICATION DATA

ISSN:

0003-6951 (print)  
1077-3118 (online)

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$abstract.society.value is a Member of CrossRef American Institute of Physics

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