Investigation of FIrpic in PhOLEDs via LC/MS technique

• Authors: Varatharajan Sivasubramaniam , Florian Brodkorb , Stephanie Hanning , Hans Loebl , Volker Elsbergen , Herbert Boerner , Ullrich Scherf , Martin Kreyenschmidt
• Languages of publication: EN

Abstracts

EN

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. [...]

Keywords

EN

Emitter; HPLC/MS; PhOLED

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2009
• Volume: 7
• Issue: 4
• Pages: 836-845

Dates

published

1 - 12 - 2009

online

6 - 10 - 2009

Contributors

author

Varatharajan Sivasubramaniam

• Department Chemical Engineering, University of Applied Sciences Münster, Steinfurt, 48565, Germany

author

Florian Brodkorb

• Department Chemical Engineering, University of Applied Sciences Münster, Steinfurt, 48565, Germany

author

Stephanie Hanning

• Department Chemical Engineering, University of Applied Sciences Münster, Steinfurt, 48565, Germany

author

Hans Loebl

• Philips Technologie GmbH-Philips Research, Aachen, 52066, Germany

author

Volker Elsbergen

• Philips Technologie GmbH-Philips Research, Aachen, 52066, Germany

author

Herbert Boerner

• Philips Technologie GmbH-Philips Research, Aachen, 52066, Germany

author

Ullrich Scherf

• Department of Macromolecular Chemistry and Technology of Polymers, Bergische University of Wuppertal, Wuppertal, 42097, Germany

author

Martin Kreyenschmidt

• Department Chemical Engineering, University of Applied Sciences Münster, Steinfurt, 48565, Germany

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Identifiers

DOI

10.2478/s11532-009-0084-1