Metal-enhanced fluorescence profile

Spectral Profile Modifications In Metal-Enhanced Fluorescence... 

The EM theory of Metal Enhanced Fluorescence (MEF) was studied and developed extensively in the 70-80 s [2,3,4,5,6], All the EM mechanims involved in MEF can be understood within classical EM theory [3,4,5,6] as confirmed in the simplest cases by quantum studies [2,12,17,18], In most of these models, the emitter is depicted as a simple two- (or three-) level system, i.e. only one emission wavelength is considered. This is appropriate in general to understand modifications of absorption or emission rates, but it entirely ignores the spectral profile of the fluorescence emission. We will first review... 

Figure 14 Fluorescence enhancement associated to Zn" coordination to 4. Full triangles refer to the spectrofluorimetric titration by standard base in aqueous MeCN of the two-component system 4, plus 1 equiv. of Zn and excess acid the titration profile obtained for a metal-free solution (open-triangles) is reported for comparative purposes. Coordination to Zn", a pH > 4.5, interrupts the eT process from the amine group adjacent to the fluorophore and awakens the fluorescence.

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