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Degradation in iTMC OLEDs

  • Leonard J. Soltzberg (a1), Velda Goldberg (a2), Michael D. Kaplan (a3), Heather Bankowski (a4), Shannon Browne (a5), Heather Concannon (a6), Megan Damour (a7), Samantha Green (a8), Elthea Hendrickson (a9), HengLian Huang (a10), Virginia Liu (a11), Lindsey Piirainen (a12), Suwathna Reel (a13), George G. Malliaras (a14), Jason D. Slinker (a15) and Stefan Bernhard (a16)...
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.

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1.Identification of a Quenching Species in Ruthenium Tris-Bipyridine Electroluminescent DevicesSoltzberg, 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, 77617764.
2.Stability of Thin-Film Solid-State Electroluminescent Devices Based on Tris (2,2'-bipyridine) Ruthenium (II) ComplexesKalyuzhny, G., Buda, M., McNeill, J., Barbara, P., and Bard, A., J. Amer. Chem. Soc. 2003, 125, 62726283.
3.Efficient Yellow Electroluminescence from a Single Layer of a Cyclometalated Iridium ComplexSlinker, 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, 27632767.
4.Extending the Solvent-free MALDI Sample Preparation MethodHanton, S.D. and Parees, D.M., J. Amer. Soc. Mass Spectrom. 2005, 16, 9093.
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MRS Online Proceedings Library (OPL)
  • ISSN: -
  • EISSN: 1946-4274
  • URL: /core/journals/mrs-online-proceedings-library-archive
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