Exciplex Emission from Perylene- Doped 9-Cyanoanthracene Crystals

Abstract

Perylene-doped 9-cyanoanthracene crystals show exciplex emission at 520 nm with a decay time of about 120 nsec. Transfer of energy from excimer to exciplex is efficient at high temperatures despite the small trap depth. At 77°K the exciplex lies 1100 cm⁻¹ above the excimer and yet no transfer from exciplex to crystal occurs. The estimated excimer-exciton parameters are: t _H ≈ 10⁻¹¹ sec⁻¹, D _z = 8 × 10⁻⁵ cm²/sec, L_z = 330 Å.