## delayed luminescence

https://doi.org/10.1351/goldbook.D01580
@L03641@ decaying more slowly than that expected from the rate of decay of the emitting state. The following mechanisms of @L03641@ provide examples:
1. triplet-triplet or @S05697@ to form one molecular entity in its excited @S05699@ and another molecular entity in its electronic @G02704@ (sometime referred to as P type),
2. @T06305@ involving reversible @I03123@ (sometimes referred to as E type), and
3. combination of oppositely charged ions or of an electron and a @C00907@. For emission to be referred to in this case as delayed @L03641@ at least one of the two reaction partners must be generated in a photochemical process.