Prof. Dr. Hartmut Yersin
University of Regensburg

Prof. Dr. Mark E. Thompson
University of Southern California, Los Angeles
Department of Chemistry

Prof. Dr. Hartmut Yersin’s group (University of Regensburg, Germany) and Prof. Dr. Mark E. Thompson’s group (University of Southern California, Los Angeles, USA) established a cooperation on OLED material characterization as a basis for further material development. The OLED technology has a great potential to be applied in television screens, large area displays, flexible and/or transparent displays, large area light sources, etc.. For OLEDs, the emitter materials play a crucial role. In particular, organometallic triplet emitter complexes provide electro-phosphorescence with high brightness and power efficiency. The cooperation aims to deepen the understanding of photophysical properties of triplet emitters and their interactions with matrix materials. The obtained knowledge is aimed to be utilized for developing new materials which meet the requirements for being applied in OLED devices.

Final report:

In the scope of this project, new materials for OLEDs were synthesized and photophysically characterized. These compounds represent triplet emitters which can be applied for highly efficient OLEDs. The joint investigations resulted in seven publications in highly ranked international journals.

Rausch A. F., Thompson M. E., Yersin H.
Blue Light Emitting Ir(III) Compounds for OLEDs - New Insights into Ancillary Ligand Effects on the Emitting Triplet State
J. Phys. Chem. A, 113, 5927 (2009)

Rausch A. F., Thompson M. E., and Yersin H.
Matrix Effects on the Triplet State of the OLED Emitter Ir(4,6-dFppy)(pic) (FIrpic): Investigations by High-Resolution Optical Spectroscopy
Inorg. Chem., 48, 1928 (2009)

Rausch A. F., Thompson, M. E., Yersin, H.
Triplet state relaxation processes of the OLED emitter Pt(4,6-dFppy)(acac)
Chem. Phys. Lett., 468, 46 (2009)

Bauer R., Finkenzeller W. J., Bogner U., Thompson M. E., Yersin H.
Matrix influence on the OLED emitter Ir(btp)2(acac) in polymeric host materials - Studies by persistent spectral hole burning
Organic Electronics, 9(5), 641 (2008)

Rausch A. F., Homeier H. H. H., Djurovich P. I., Thompson M. E., Yersin H.
Spin-orbit coupling routes and OLED performance - Studies of blue light emitting Ir(III) and Pt(II) complexes in:
Organic Light Emitting Materials and Devices XI, eds. Z. H. Kafafi, F.So, Proceedings of SPIE, 6655, 66550F (2007)

Finkenzeller W. J., Thompson M. E., and Yersin H.
Phosphorescence dynamics and spin-lattice relaxation of the OLED emitter Ir(btp)2(acac)
Chem. Phys. Lett., 444, 273 (2007)

Finkenzeller W. J., Hofbeck T., Thompson M. E., and Yersin H.
Triplet state properties of the OLED emitter Ir(btp)2(acac) - Characterization by site-selective spectroscopy and application of high magnetic fields
Inorg. Chem., 46, 5076 (2007)