Structure of 4,4′-Dichlorobenzophenone: Implications for Low Temperature Transport of Triplet Excitations

Abstract

As inferred from our x-ray single-crystal diffraction data, the microscopic mechanism of the structural phase transition at 190 K in 4,4′-dichlorobenzophenone is such that certain structural imperfections must be inevitably present in the low-temperature phase. Taese defects can be the physical cause behind the shallow X-traps for triplet excitons, as observed in luminescence spectra.

Key Words:

• 4,4′-dichlorobenzophenone
• structure
• phase transition
• intrinsic defects
• exciton traps