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• Introduction
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Delayed Fluorescence

Kinetic components of delayed fluorescence

At each moment the DF intensity is determined by the number (concentration) of reaction centres in a state capable of producing charge recombination. The kinetics of the DF decay follows the depletion (deactivation) of these states:

dc_i / dt = −k_i c_i

or, in integral form:

c_i (t) = c₀ e^−k_it,

where c_i is the concentration of reaction centres in the i-th state and k_i is the sum of the rate constants of the forward and reverse electron transfer reactions of this state.

The DF intensity can then be expressed as a sum of exponents (Lavorel, 1975):

L (t) = Σ L_i e^−t/τ_i,

where L_i is the amplitude and τ_i is the characteristic time of the i-th component.

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