delayed fluorescence

Also contains definition of: recombination fluorescence
Three types of delayed @F02453@ are known:
  1. E-type delayed @F02453@: The process in which the first excited @S05699@ becomes populated by a thermally activated @R05057@ from the first excited @T06503@. Since in this case the populations of the singlet and triplet states are in thermal equilibrium, the lifetimes of delayed @F02453@ and the concomitant @P04569@ are equal.
  2. P-type delayed @F02453@: The process in which the first excited @S05699@ is populated by interaction of two molecules in the @T06503@ (triplet-triplet @A00366@) thus producing one molecule in the excited @S05699@. In this @B00669@ the @L03515@ of delayed @F02453@ is half the value of the concomitant @P04569@.
  3. Recombination fluorescence: The first excited @S05699@ becomes populated by recombination of @R05073@ 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]
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2235 [Terms] [Paper]