Frankfurt 2006 – scientific programme
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Q: Quantenoptik und Photonik
Q 72: Poster Laserspektroskopie
Q 72.3: Poster
Thursday, March 16, 2006, 16:30–18:30, Labsaal
Absorption and Emission Spectroscopic Characterisation of OLED Material PtOEP — •Ashu Kumar Bansal1, Wolfgang Holzer1, Alfons Penzkofer1, and Taiju Tsuboi2 — 1Institut II - Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany — 2Kyoto Sangyo University, Faculty of Engineering, Kamigamo, Kita-ku, Kyoto 603-8555, Japan
The absorption and emission spectroscopic behaviour of the platinium complexed porphyrine PtOEP (platinium-octaethyl-porphyrine) is studied at room temperature. Liquid solutions, doped films, and a neat film are investigated. The absorption cross-section spectra including singlet-triplet absorption, the triplet-singlet stimulated emission cross-section spectra, the phosphorescence quantum distributions, the phosphorescence quantum yields and the phosphorescence signal decays are determined. In neat films phosphorescence self-quenching occurs. In polystyrene and dicarbazole-biphenyl (CBP) films as well as in de-aerated liquid solutions (tetrahydrofuran, toluene, chloroform) high phosphorescence quantum yields are obtained (e.g. 38 % in CBP film). In air-saturated liquid solutions the phosphorescence efficiency is reduced by oxygen quenching (e.g. 0.13 % in toluene). In the case of intense picosecond laser pulse excitation, the phosphorescence lifetime is shortened by triplet-triplet annihilation.