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Fluorescence Quantum Yield (h_Fl)

One of the most important properties of a dye is the fluorescence quantum yield (h_Fl). The quantum yield is defined as the quotient of the number of emitted (n_Fl) and the number of absorbed photons (n_Abs).

h_Fl = n_Fl / n_Abs

It should be noted that the quantum yield can never exceed 100%. 

Obviously a high quantum yield is benificial if a dye is to be observed via fluorescence.

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