While extinction coefficients are known (see the table above), quantum yields and life times are not.
It requires a chemical with a known quantum yield and easily analyzed reaction products.
The quantum yield of isomerization can be strongly dependent on conditions (see below).
This low quantum yield means that other photochemical processes are occurring.
The fluorescence shows especially in nonpolar solvents with a high quantum yield.
This design strategy has achieved luminescent quantum yields of 42% in the solid state.
The luminescence has a lifetime of several microseconds and the quantum yield below 0.1%.
Here, quantum yield is the emission efficiency of a given fluorophore.
Since not all photons are absorbed productively, the typical quantum yield will be less than 1.
Compounds with quantum yields of 0.10 are still considered quite fluorescent.