Central European Journal of Chemistry

, 7:836

Investigation of FIrpic in PhOLEDs via LC/MS technique

Authors

    • Department Chemical EngineeringUniversity of Applied Sciences Münster
  • Florian Brodkorb
    • Department Chemical EngineeringUniversity of Applied Sciences Münster
  • Stephanie Hanning
    • Department Chemical EngineeringUniversity of Applied Sciences Münster
  • Hans Peter Loebl
    • Philips Technologie GmbH-Philips Research
  • Volker van Elsbergen
    • Philips Technologie GmbH-Philips Research
  • Herbert Boerner
    • Philips Technologie GmbH-Philips Research
  • Ullrich Scherf
    • Department of Macromolecular Chemistry and Technology of PolymersBergische University of Wuppertal
  • Martin Kreyenschmidt
    • Department Chemical EngineeringUniversity of Applied Sciences Münster
Research Article

DOI: 10.2478/s11532-009-0084-1

Cite this article as:
Sivasubramaniam, V., Brodkorb, F., Hanning, S. et al. cent.eur.j.chem. (2009) 7: 836. doi:10.2478/s11532-009-0084-1
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Abstract

The commercial breakthrough of phosphorescent organic white light sources is presently hampered due to the unavailability of a stable blue phosphorescent emitter material. Moreover, only few analytical investigations have been made regarding the chemical degradation of the phosphorescent emitter materials during the processing or the operation of the devices.

Organic light emitting devices (OLEDs) containing phosphorescent metal complexes with iridium as central ion were investigated. Special attention was paid to the chemical degradation of the material. The devices were analyzed by means of high performance liquid chromatography coupled with mass spectrometry (HPLC/MS). Electron spray ionization (ESI) was employed as ionization source. Isomerization phenomena of the blue-green emitting heteroleptic iridium complex FIrpic could be observed after the device manufacture and after operation. These findings could give hints on the mechanisms that influence the lifetime of PhOLEDs based on FIrpic or similar blue emitters.

https://static-content.springer.com/image/art%3A10.2478%2Fs11532-009-0084-1/MediaObjects/11532_2009_84_Fig1_HTML.jpg

Keywords

EmitterHPLC/MSPhOLED
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© © Versita Warsaw and Springer-Verlag Berlin Heidelberg 2009