Phys. Rev. Lett. 97, 143903 (2006) [3 pages]

Up-Conversion Fluorescence: Noncoherent Excitation by Sunlight

Abstract

References

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S. Baluschev^1,*, T. Miteva^2,†, V. Yakutkin¹, G. Nelles², A. Yasuda², and G. Wegner¹
¹Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
²Sony Deutschland GmbH, Materials Science Laboratory, Hedelfingerstrasse 61, 70327 Stuttgart, Germany

Received 2 May 2006; published 4 October 2006

See accompanying Physics Focus

We demonstrate up-conversion of noncoherent sunlight realized by ultralow excitation intensity. The bimolecular up-conversion process in our systems relies on the presence of a metastable triplet excited state, and thus has dramatically different photophysical characteristics relative to the other known methods for photon up-conversion (two-photon absorption, parametric processes, second harmonic generation, sequential multiphoton absorption, etc.).

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.97.143903

DOI:

10.1103/PhysRevLett.97.143903

PACS:

42.25.Kb, 42.65.Ky, 42.70.Jk, 42.79.Nv

^*Electronic address: balouche@mpip-mainz.mpg.de

^†Electronic address: miteva@sony.de

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Phys. Rev. Lett. 97, 143903 (2006) [3 pages]

Up-Conversion Fluorescence: Noncoherent Excitation by Sunlight