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Scientific article
English

The quantum efficiency of the photo-excitation in a Fe(II) spin-crossover compound

Contributors

Enachescu, Cristian; Oetliker, Ulrich; Hauser, Andreas

Published in

Journal of Optoelectronics and Advanced Materials, vol. 5, no. 1, p. 267-272

Publication date

2003

Abstract

In this paper we discuss on the quantum efficiency in spin crossover compounds. Spin crossover solids are text-book examples of photo switchable materials that present a thermal spin transition from the diamagnetic low-spin state, thermodynamically stable at low temperatures, to the paramagnetic high-spin state becoming the thermodynamically stable state at elevated temperature. By irradiating them with an appropriate wavelength, they can pass from the stable low spin state to the metastable high spin state at temperatures below the thermal transition temperature. For the compound [Fe(pic)3]Cl2·EtOH, the question regarding the quantum efficiency of the photo-conversion process that is the number of molecules converted by one single photon and its possible dependency on irradiation intensity gave rise to a controversy. The experimental results presented in this paper demonstrate that the quantum efficiency of the photo-conversion at 11 K is on the order of unity, with no noticeable dependency of the quantum efficiency on light intensity. It does, however, depend to a small extent on the fraction of complexes already converted to the high-spin state.

Keywords

  • Spin transition
  • Quantum efficiency
  • Spin transition compounds

UNIGE affiliation entities

UNIGE research groups

Citation (ISO format)

ENACHESCU, Cristian, OETLIKER, Ulrich, HAUSER, Andreas. The quantum efficiency of the photo-excitation in a Fe(II) spin-crossover compound. In: Journal of Optoelectronics and Advanced Materials, 2003, vol. 5, n° 1, p. 267–272.

Identifiers

  • PID : unige:3690

Additional URL for this publication

http://inoe.inoe.ro/JOAM/pdf5_1/enachoet.pdf
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Technical informations

Creation

06/10/2009 11:58:45

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06/10/2009 11:58:45

Update

14/03/2023 15:16:01

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