Time-resolved luminescence study of 2-aminobenzophenone in rigid matrices at 77 K has revealed its fluorescence and phosphorescence. The Phosphorescence consisted of two components with different bond structures, triplet energies, lifetimes, and anisotropies. These behaviors were explained by the presence of two ground-state conformers of 2-ABP with different reactivities for the excited-state intramolecular proton transfer.