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PHOTOPROCESSES IN THE ORGANIC SOLID STATE *
Author(s) -
Hochstrasser Robin M.
Publication year - 1964
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1964.tb08153.x
Subject(s) - intersystem crossing , chemical physics , excited state , exciton , relaxation (psychology) , molecule , annihilation , photochemistry , chemistry , excitation , molecular solid , organic molecules , triplet state , electron transfer , solid state , atomic physics , singlet state , condensed matter physics , physics , organic chemistry , psychology , social psychology , quantum mechanics
Summary The various known photo‐relaxation phenomena in organic crystals are reviewed. The discussion is confined to molecular crystals, and aggregates of organic molecules, in which the low‐lying excited electronic states are either πpgr;*, nπ*, or electron‐transfer type. The pathways for excitation in isolated molecules with these types of electronic states are compared with the corresponding process in solids. Particular emphasis is placed on the possible roles of intersystem crossing, triplet‐triplet energy transfer and annihilation in solid state photochemistry. Free and localized excitons, energy migration between impurity traps, and some aspects of photoconduction in organic materials are discussed.