https://doi.org/10.1351/goldbook.D01580
Luminescence decaying more slowly than that expected from the rate of decay of the emitting state. The following mechanisms of luminescence provide examples:
- triplet-triplet or singlet-singlet annihilation to form one molecular entity in its excited singlet state and another molecular entity in its electronic ground state (sometime referred to as P type),
- thermally activated delayed fluorescence involving reversible intersystem crossing (sometimes referred to as E type), and
- combination of oppositely charged ions or of an electron and a cation. For emission to be referred to in this case as delayed luminescence at least one of the two reaction partners must be generated in a photochemical process.
See also: delayed fluorescence