Hostname: page-component-76fb5796d-2lccl Total loading time: 0 Render date: 2024-04-26T07:36:33.427Z Has data issue: false hasContentIssue false
  • English
  • Français

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
...Show all authors
Leonard J. Soltzberg
Affiliation:
lsoltzberg@simmons.edu, Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA, 02115, United States, 617-521-2728, 617-521-3086
Velda Goldberg
Affiliation:
velda.goldberg@simmons.edu, Simmons College, Department of Physics, 300 The Fenway, Boston, MA, 02115, United States
Michael D. Kaplan
Affiliation:
michael.kaplan@simmons.edu, Simmons College, Department of Physics, 300 The Fenway, Boston, MA, 02115, United States
Heather Bankowski
Affiliation:
heather.bankowski@simmons.edu, Simmons College, Department of Physics, 300 The Fenway, Boston, MA, 02115, United States
Shannon Browne
Affiliation:
shannon.browne@simmons.edu, Simmons College, Department of Physics, 300 The Fenway, Boston, MA, 02115, United States
Heather Concannon
Affiliation:
heather.concannon@simmons.edu, Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA, 02115, United States
Megan Damour
Affiliation:
megan.damour@simmons.edu, Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA, 02115, United States
Samantha Green
Affiliation:
samantha.green@simmons.edu, Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA, 02115, United States
Elthea Hendrickson
Affiliation:
elthea.hendrickson@simmons.edu, Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA, 02115, United States
HengLian Huang
Affiliation:
henglian.huang@simmons.edu, Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA, 02115, United States
Virginia Liu
Affiliation:
virginia.liu@simmons.edu, Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA, 02115, United States
Lindsey Piirainen
Affiliation:
lindsey.piirainen@simmons.edu, Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA, 02115, United States
Suwathna Reel
Affiliation:
suwathna.reel@simmons.edu, Simmons College, Department of Physics, 300 The Fenway, Boston, MA, 02115, United States
George G. Malliaras
Affiliation:
ggm1@cornell.edu, Cornell University, Materials Science & Engineering, Bard Hall, Ithaca, NY, 14853-1301, United States
Jason D. Slinker
Affiliation:
js395@cornell.edu, Cornell University, Materials Science & Engineering, Bard Hall, Ithaca, NY, 14853-1301, United States
Stefan Bernhard
Affiliation:
bern@princeton.edu, Princeton University, >Department of Chemistry, Frick Laboratory, Princeton, NJ, 08544, United States
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

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
2.“Stability of Thin-Film Solid-State Electroluminescent Devices Based on Tris (2,2'-bipyridine) Ruthenium (II) Complexes” Kalyuzhny, G., Buda, M., McNeill, J., Barbara, P., and Bard, A., J. Amer. Chem. Soc. 2003, 125, 6272–6283.10.1021/ja029550iGoogle Scholar
3.“Efficient Yellow Electroluminescence from a Single Layer of a Cyclometalated Iridium Complex” Slinker, J.D., Gorodetsky, A.A., Lowry, M.S., Wang, J., Parker, S., Rohl, R., Bernhard, S., and Malliaras, G.G., J. Amer. Chem. Soc. 2004, 126, 2763–2767.10.1021/ja0345221Google Scholar
4.“Extending the Solvent-free MALDI Sample Preparation Method” Hanton, S.D. and Parees, D.M., J. Amer. Soc. Mass Spectrom. 2005, 16, 90–93.Google Scholar