Migration of electronic excitation energy in the charge-transfer crystal of pyromellitic dianhydride-phenanthrene

✍ Scribed by B. Kozankiewicz; J. Al-Abbas; J. Prochorow

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 618 KB
• Volume: 235
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(95)00162-w

✦ Synopsis

Singlet and triplet exciton energy migration in the charge-transfer crystal of pyromellitie dianhydride-phenanthrene, undoped and doped with anthracene (10-4-10-2 M/M), have been studied in the 5-300 K temperature range. At low temperatures singlet and triplet excitons are self-trapped. They become mobile with increasing temperature with activation energies of 380 2:70 and 400 2:80 cm-z for singlet and triplet excitons, respectively. The motion of triplet excitons in the temperature range 50-100 K can !~' described by one-dimensional hopping within cages, limited by structural defects of the host crystal, Mobile singlet excitons are observed for temperatures above 100 K and their motion is well described by a time-independent excitation transfer rate constant,