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Degradation of Ir(ppy)2(dtb-bpy)PF6 iTMC OLEDs

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Abstract

Simplicity of construction and operation are advantages of iTMC (ionic transition metal complex) OLEDs compared with multi-layer OLED devices. Unfortunately, lifetimes do not compare favorably with the best multi-layer devices. We have previously shown for Ru(bpy)3(PF6 2 based iTMC OLEDs that electrical drive produces emission-quenching dimers of the active species. We report evidence here that a chemical process may also be implicated in degradation of devices based on Ir(ppy)2(dtb-bpy)PF6 albeit by a very different mechanism. It appears that degradation of operating devices made with this Ir-based complex is related to current-induced heating of the organic layer, resulting in loss of the dtb-bpy ligand. (The dtb-bpy ligand is labile compared with the cyclometallated ppy ligands.) Morphological changes observed in electrically driven Ir(ppy)2(dtb-bpy)PF6 OLEDs provide evidence of substantial heating during device operation. Evidence from UV-vis spectra in the presence of an electric field as well as MALDI-TOF mass spectra of the OLED materials before and after electrical drive add support for this model of the degradation process.

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References

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Authors and Affiliations

  1. Chemistry and Physics Departments, Simmons College, Boston, Massachusetts, USA

    Velda Goldberg, Michael D. Kaplan, Leonard Soltzberg, Dolly Armira, Megan Bigelow, Stephanie Bitzas, Rachel Brady, Shannon Browne, Bianca Dichiaro, Heather Foley, Lauren Hutchinson, Alison Inglis, Nicole Kawamoto, Amanda McLaughlin, Caitlin Millett, Hanah Nasri, Sarah Newsky, Cassandra Saikin, Mary Scharpf, Melissa Trieu & George G. Malliaras

  2. Materials Science & Engineering Department, Cornell University, Ithaca, New York, USA

    Tram Pham

  3. Chemistry Department, Princeton University, Princeton, New Jersey, USA

    Stefan Bernhard

Authors
  1. Velda Goldberg
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  2. Michael D. Kaplan
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  3. Leonard Soltzberg
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  4. Dolly Armira
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  5. Megan Bigelow
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  6. Stephanie Bitzas
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  7. Rachel Brady
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  8. Shannon Browne
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  9. Bianca Dichiaro
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  10. Heather Foley
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  11. Lauren Hutchinson
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  12. Alison Inglis
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  13. Nicole Kawamoto
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  14. Amanda McLaughlin
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  15. Caitlin Millett
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  16. Hanah Nasri
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  17. Sarah Newsky
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  18. Cassandra Saikin
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  19. Mary Scharpf
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  20. Melissa Trieu
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  21. George G. Malliaras
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  22. Tram Pham
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  23. Stefan Bernhard
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Goldberg, V., Kaplan, M.D., Soltzberg, L. et al. Degradation of Ir(ppy)2(dtb-bpy)PF6 iTMC OLEDs. MRS Online Proceedings Library 1154, 1038 (2008). https://doi.org/10.1557/PROC-1154-B10-38

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  • DOI: https://doi.org/10.1557/PROC-1154-B10-38

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