Energy transfer, Langmuir-Blodgett films

Figure 48. TOF spectrum transformed to energy transfer distribution for the Langmuir-Blodgett film described in the text at 130 K. The jagged line corresponds to the helium scattering data, and the solid line is calculated from the Manson theoty as described in the text. The inset shows the initial energy spread in the helium atom beam. (Reproduced from Fig. 1 of Ref, 133, with permission.)...

The fluorescence for adsorbed molecules was apparently quenched due to the reduced lifetime of the excited state in a molecule adsorbed at the metal surface as discussed earlier. Quenching due to the energy transfer to the metal can also be observed in molecules that are desorbed but reside in the electrolyte layer near the electrode surface. According to the so-called Forster energy transfer mechanism, observed in the membrane studies [35,40] and in Langmuir-Blodgett films [41], the change of the fluorescence intensity with separation of the fluorescent molecule from the quencher (metal) is described by the formula... 

Aggregation and Energy Transfer in Langmuir-Blodgett Films of 5-(4-N-Octadecylpyridyl)-10,I5,20-tri-p-tolylporphyrin Studied by Ultraviolet-Visible and Fluorescence Spectroscopies, Langmuir Vi, 5726-5731 (1997). 

Yu, Q. Vuorimaa, E. Tkachenko, N. V. Lemmetyinen, H. Interlayer energy transfer between pyrene-dodecanoic acid and NBD-dodecanoic acid in Langmuir-Blodgett films. J. Lumin. 1997, 75, 245-253. 

Saint Pierre M and Dupeyrat M 1983 Measurement and meaning of the transfer prooess energy in the building up of Langmuir-Blodgett multilayers Thin Solid Films 99 205-13... 

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