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O: Fachverband Oberflächenphysik
O 22: Organic-Inorganic Hybrid Systems and Organic Films
O 22.15: Poster
Montag, 7. März 2016, 18:15–20:30, Poster E
Triplet emitters for OLEDs investigated by STM and STS — •Anne Bakker1,2, Wu Xu3, Sebastian Wilde1,2, Shiyu Zhu3, Haiming Guo3, Shixuan Du3, Hong Ying Gao1,2, Hongjun Gao3, Cristian Strassert1,2, and Harald Fuchs1,2 — 1Physikalisches Institut, Westfälische Wilhelms-Universität, Münster, Germany — 2CeNTech, Westfälische Wilhelms-Universität, Münster, Germany — 3Institute of Physics, Chinese Academy of Sciences, Beijing, China
Pt(II)-triplet emitters are promising candidates for application in OLEDs. The heavy-metal atom with its large spin-orbit coupling enables emission via triplet states with high phosphorescence quantum yield. In previous work it has been shown that the HOMO-LUMO gap of such emitters can be tuned by adjusting the substituents in the periphery of the luminophoric pincer ligand coordinated to the metal centre [1,2].
Here we study the self-assembled nanostructures and electronic properties of a series of new triplet emitters by low-temperature scanning tunnelling microscopy and spectroscopy. In our case the metal-organic complex contains a platinum d8 cation and a tetradentate ligand. To systematically investigate the influence of different electron-withdrawing side groups on the alignment of the energy levels, ligands with 0, 2, 4, and 6 Fluor atoms are used. Our experiments can provide insight in the behaviour of Pt(II)-complexes on surfaces and the possibilities to specifically design new triplet emitters.
[1] P.R. Ewen et al., Physcal Review Letters 111, 267401, (2013)
[2] J. Sanning et al., Angewandte Chemie 54, 786-791, (2015)