ENERGY-STATE OF LEAD PHTHALOCYANINE IN TH E SINGLET-TRIPLET TRANSITION BAND

Absorption spectra of single crystals of the triclinic structure and p hoto-emf spectra of polycrystalline films of lead phthalocyanine (PbPc ) with different content of the crystallites of monoclinic and triclin ic modification In the region of singlet triplet (S0 - T1) transition were investigated. The existence of three states with the energy of 0. 95 (E1), 1.02 (E2) and 1.1 eV (E3) was shown. The E2 state is connecte d with S0 - T1 transition, while the E1 and E3 states are caused by th e excitation of the complexes of molecules PbPc with oxygen in crystal lites of different modifications.