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Investigation of FIrpic in PhOLEDs via LC/MS technique |
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| Authors: | Varatharajan Sivasubramaniam Florian Brodkorb Stephanie Hanning Hans Peter Loebl Volker van Elsbergen Herbert Boerner Ullrich Scherf Martin Kreyenschmidt |
| Institution: | (1) Department of Biomedical Engineering, University of Michigan, 1101 Beal Ave., Lurie BME Bldg., No. 2122, Ann Arbor, MI 48109, USA;(2) Department of Oral and Maxillofacial Surgery, University of Michigan, Ann Arbor, MI, USA;(3) Department of Radiology, University of Michigan, Ann Arbor, MI, USA;(4) School of Dentistry, University of Michigan, Ann Arbor, MI, USA;(5) Sound Sight Research, Livonia, MI, USA |
| 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. |
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