Delayed fluorescence in a pyrene-doped naphthalene crystal: homofusion and heterofusion of triplet excitons

✍ Scribed by A.J. Pal; T.N. Misra

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 462 KB
• Volume: 130
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(86)80500-0

✦ Synopsis

Prompt and delayed emissions from a naphthalene crystal doped with pyrene have been investigated in the temperature range 77-300 K. It is shown that delayed fluorescence (DF) in this crystal originates from heterofusion and homofusion of two different types of trap triplets at low temperature (T< 130 K) and from homofusion of pyrene triplets at high temperature ( T> 200 K). Pyrene concentration effects on DF suggest that free triplet excitons are trapped more efftciently at monomeric pyrene sites than at nascent excimeric pyrene sites.