Exciton trapping and self-trapping in molecular crystals

✍ Scribed by D.P. Craig; L.A. Dissado; S.H. Walmsley

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 646 KB
• Volume: 46
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(77)85194-4

✦ Synopsis

Exciton traps in molecular crystals at low temperature are discussed for three types: chemical traps formed by fareign molecules, physical traps formed by structural disturbance of the host or pure crystal and self-traps. Self-traps are redefïned in terms of intra-and ïntermolecular processes which slow the rate of exciton transfer below the rate for rigid moIecuIes in a rigid lattice. Trapping rates from initially delocalized exciton states into trap states depend on elciton-photcn coupIing_ Expressions are given for these rates.