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Advanced Materials

Sub-Microsecond Molecular Thermometry Using Thermal Spin Flips


  • The authors are indebted to the DFG for financial support through the SFB 486 and the Gottfried Wilhelm Leibniz Award, as well as to the BMBF through the OLAS collaboration. Technical assistance by A. Helfrich and W. Stadler is greatly appreciated.


The application of platinumporphyrin (an organic semiconductor) as a sensitive molecular thermometer is demonstrated. The instantaneous temperature controls the rate of reverse intersystem crossing after optical population of the triplet, so the ratio of triplet-to-singlet emission provides a measure of temperature (see Figure). Sudden electrical heating of a metallic electrode is monitored with sub-microsecond accuracy, providing input to display design considerations.

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