Regensburg 2004 – wissenschaftliches Programm

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SYOH: Organic and Hybrid Systems for Future Electronics

SYOH 5: Poster

SYOH 5.84: Poster

Donnerstag, 11. März 2004, 18:00–21:00, B

Time resolved temperature measurements using molecular thermometers — •Joachim Stehr, Gunnar Raschke, Thomas A. Klar, John M. Lupton, and Jochen Feldmann — Photonics and Optoelectronics Group, Department of Physics and CeNS, Ludwig-Maximilians-Universität, Amalienstrasse 54, 80799 Munich

Platin octaethyl porphyrin (PtOEP) shows a photoluminescence (PL) spectrum dominated by a red band at 650 nm and a thermally activatable band at 540 nm. Therefore, this molecule can be used as a molecular thermometer by taking the ratio between these two emission bands. A resolution of 0.25 K has been demonstrated [1]. We want to use these molecular thermometers to observe heating and cooling dynamics at the surface of micro and nano objects. Heating is accomplished either by pulsed electrical excitation of thin wires or by pulsed optical excitation of nanoparticles. The optical excitation of the PtOEP molecules is delayed with respect to the heating pulses. Towards the realisation of such a molecular thermometer we also investigate the internal dynamics of the PtOEP molecules following excitation.
J. M. Lupton, Appl. Phys. Lett. 81, 2478 (2002)