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Cited by 260Photochemistry and Electron Transfer StudiesSpectroscopy and Quantum Chemical StudiesLanthanide and Transition Metal Complexes

Variation of the Fluorescence Decay Time of a Molecule in Front of a Mirror

Drexhage, K. H., Kuhn, H., Schäfer, F. P.·1968·Berichte der Bunsengesellschaft für physikalische Chemie
DOI 10.1002/bbpc.19680720261
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Abstract

The out‐going wave‐front of a radiating oscillator (e. g. a Hertzian dipole) is disturbed by a reflecting surface. The resulting interference phenomenon affects the radiated power, which thus depends on the distance between oscillator and mirror. If this concept is applied to the emission of light by molecules, a dependence of the fluorescence decay time on the distance between excited molecule and mirror is to be expected. This effect has been investigated for the case of monomolecular layers of an europium dibenzoylmethane complex, which are kept in a definite distance from an evaporated metal surface (gold, silver or aluminum) by cadmiumarachidate layers. Exciting with a flash of 366 nm light the intense red fluorescence (λ = 612 nm) of the europium ion is observed. The fluorescence follows an exponential decay law over at least two decades with a decay time of roughly 1 msec. The expected variation of the decay time with distance from the mirror is verified by the experiment. The decay time is lengthened or shortened in close agreement with the above theory, except for small distances, where energy transfer processes occur. The mirror affects only the radiating process, while the probabilities for non‐radiating desactivation processes remain unaltered. Thus the quantum yield of fluorescence of the emitting state can be determined, which is an otherwise hardly accessible quantity.

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  • First experimental demonstrations of the inhibition and enhancement of a spontaneous emission rate were carried out in the 1970s with molecules such as europium complexes in Langmuir-Blodgett films deposited on metallic mirrors.

    “First experimental demonstrations of the inhibition and enhancement of a spontaneous emission rate were carried out in the 1970s with molecules such as europium complexes in Langmuir-Blodgett films deposited on metallic mirrors (Drexhage et al 1968, Kuhn 1970, Chance et al 1974).”

    From Single-photon sources (2005) · cites this paper as Drexhage et al 1968

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Authors
Drexhage, K. H., Kuhn, H., & Schäfer, F. P.
Affiliations
Philipps University of Marburg (DE)
ORCID
Schäfer, F. P.
Venue
Berichte der Bunsengesellschaft für physikalische Chemie
Publisher
Wiley
Published
1968-03
Volume
72
Issue
2
Pages
329-329
ISSN
0005-9021 (ISSN-L)
DOI
10.1002/bbpc.19680720261
OpenAlex
W1847381154
Cited by
260
References
0
Citations by year
2026: 5 · 2025: 6 · 2024: 4 · 2023: 8 · 2022: 31 · 2021: 10 · 2020: 7 · 2019: 9 · 2018: 14 · 2017: 9 · 2016: 5 · 2015: 17 · 2014: 8 · 2013: 7 · 2012: 8
FWCI
2.61
Type
journal article
Language
en
Open access
closed
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor, 15404 d)
Locations
Berichte der Bunsengesellschaft für physikalische Chemie (publishedVersion)
Topics
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Spectroscopy and Quantum Chemical Studies
  • Physical Sciences › Materials Science › Materials Chemistry › Lanthanide and Transition Metal Complexes
Keywords
fluorescence lifetime, specular reflection, europium complexes, monomolecular layers, cadmium arachidate, quantum yield, energy transfer, non-radiative deactivation, Hertzian dipole

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