Berlin 2005 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 15: Special techniques

CPP 15.2: Vortrag

Montag, 7. März 2005, 16:45–17:00, TU C230

Sub-microsecond molecular thermometry using thermal spin flips — •Joachim Stehr, John M. Lupton, Martin Reufer, Gunnar Raschke, Thomas A. Klar, and Jochen Feldmann — Photonics and Optoelectronics Group, Department of Physics and CeNS, Ludwig-Maximilians-Universität, 80799 Munich

We recently presented a highly sensitive molecular thermometer based on dual emission from the commonly used organic semiconductor platinum octaethyl porphyrin (PtOEP). This enables contact free optical thermometry of very thin films of conjugated polymers, such as in light-emitting diodes. [1]

We have now improved our detection scheme and are able to demonstrate the exceptional time resolution achievable with PtOEP molecular thermometers by measuring the instantaneous temperature of a conducting metallic strip line on the nanosecond time scale. As the molecular thermometer works by thermally activated emission from a long-lived meta-stable state, we are able to achieve fluorescence based thermal imaging without the potentially perturbing influence of the exciting light source. With its giant thermochromism PtOEP can also be used for direct non-contact thermal imaging. [2]

[1] J. M. Lupton, Appl. Phys. Lett. 81, 2478 (2002)

[2] J. Stehr et. al. Adv. Mater., in press