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Degradation in iTMC OLEDs

Published online by Cambridge University Press:  01 February 2011

Leonard J. Soltzberg ,
Velda Goldberg ,
Michael D. Kaplan ,
Heather Bankowski ,
Shannon Browne ,
Heather Concannon ,
Megan Damour ,
Samantha Green ,
Elthea Hendrickson  and
HengLian Huang
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Leonard J. Soltzberg
Affiliation:
[email protected], Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA, 02115, United States, 617-521-2728, 617-521-3086
Velda Goldberg
Affiliation:
[email protected], Simmons College, Department of Physics, 300 The Fenway, Boston, MA, 02115, United States
Michael D. Kaplan
Affiliation:
[email protected], Simmons College, Department of Physics, 300 The Fenway, Boston, MA, 02115, United States
Heather Bankowski
Affiliation:
[email protected], Simmons College, Department of Physics, 300 The Fenway, Boston, MA, 02115, United States
Shannon Browne
Affiliation:
[email protected], Simmons College, Department of Physics, 300 The Fenway, Boston, MA, 02115, United States
Heather Concannon
Affiliation:
[email protected], Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA, 02115, United States
Megan Damour
Affiliation:
[email protected], Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA, 02115, United States
Samantha Green
Affiliation:
[email protected], Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA, 02115, United States
Elthea Hendrickson
Affiliation:
[email protected], Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA, 02115, United States
HengLian Huang
Affiliation:
[email protected], Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA, 02115, United States
Virginia Liu
Affiliation:
[email protected], Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA, 02115, United States
Lindsey Piirainen
Affiliation:
[email protected], Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA, 02115, United States
Suwathna Reel
Affiliation:
[email protected], Simmons College, Department of Physics, 300 The Fenway, Boston, MA, 02115, United States
George G. Malliaras
Affiliation:
[email protected], Cornell University, Materials Science & Engineering, Bard Hall, Ithaca, NY, 14853-1301, United States
Jason D. Slinker
Affiliation:
[email protected], Cornell University, Materials Science & Engineering, Bard Hall, Ithaca, NY, 14853-1301, United States
Stefan Bernhard
Affiliation:
[email protected], Princeton University, >Department of Chemistry, Frick Laboratory, Princeton, NJ, 08544, United States
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Abstract

The processes underlying degradation of organic light emitting diodes (OLEDs) are gradually becoming understood. In ruthenium-based ionic transition metal complex (iTMC) OLEDs, a dimeric species forms during device operation that quenches light emission [1]. Water has been implicated in this degradation process [2]. We report recent studies on degradation of OLEDs fabricated with Ir(ppy)2(dtb-bpy)PF6 [ppy = 2-phenylpyridine, dtb-bpy = 4,4'-di-tert-butyl 2,2'-bipyridine [3]. We have found that applying a thicker-than-usual metal electrode results in shorter turn-on times and higher light emission, though little improvement in lifetime. It appears that the degradation of these devices occurs by a different mechanism from that of the ruthenium-based devices and may involve local heating leading to chemical decomposition of the organic material.

Observation of recurring but often transient dark-colored substances in both the Ru(bpy)3(PF6)2 and Ir(ppy)2(dtb-bpy)PF6 systems, seen both in the solid state and in solution samples, may also be indicative of decomposition.

Keywords

optoelectronicmass spectroscopyoptical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1029: Symposium F – Interfaces in Organic and Molecular Electronics III , 2007 , 1029-F03-30
Copyright
Copyright © Materials Research Society 2008

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References

1.“Identification of a Quenching Species in Ruthenium Tris-Bipyridine Electroluminescent Devices” Soltzberg, L.J., Slinker, J.D., Flores-Torres, S., Bernards, D.A., Malliaras, G.G., Abruña, H.D., Kim, J-S., Friend, R.H., Kaplan, M.D. and Goldberg, V., J. Amer. Chem. Soc. 2006, 128, 7761–7764.10.1021/ja055782gGoogle Scholar
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