delayed fluorescence

Also contains definition of: recombination fluorescence
Three types of delayed @[email protected] are known:
  1. E-type delayed @[email protected]: The process in which the first excited @[email protected] becomes populated by a thermally activated @[email protected] from the first excited @[email protected] Since in this case the populations of the singlet and triplet states are in thermal equilibrium, the lifetimes of delayed @[email protected] and the concomitant @[email protected] are equal.
  2. P-type delayed @[email protected]: The process in which the first excited @[email protected] is populated by interaction of two molecules in the @[email protected] (triplet-triplet @[email protected] ) thus producing one molecule in the excited @[email protected] In this @[email protected] the @[email protected] of delayed @[email protected] is half the value of the concomitant @[email protected]
  3. Recombination fluorescence: The first excited @[email protected] becomes populated by recombination of @[email protected] with electrons or by recombination of radical ions of opposite charge.
See also:
delayed luminescence
PAC, 1984, 56, 231. (Nomenclature, symbols, units and their usage in spectrochemical analysis-Part VI: molecular luminescence spectroscopy) on page 233 [Terms] [Paper]
See also:
Orange Book, 2nd ed., p. 185 [Terms] [Book]
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2235 [Terms] [Paper]