Luminescent and UR-spectral studies of doped polycrystalline triptycene

Abstract

The luminescent and excitation spectra of polycrystalline triptycene doped by diphenyl and triazole have been studied. In triptycene—diphenyl systems sensitized luminescence was observed when the excitation of the matrix (triptycene) led to luminiscence of the energy acceptor — the dopant. For the latter system the maximum luminescence of the donor and that of the excitation band of the energy acceptor differ by 10 nm, unlike the triptycene—triazole system where differences amount to 75 nm and the sensitized luminescence was not detected. This result is consistent with the notion that effective electronic excitation energy transfer occurs in systems with the greatest overlap of the emission spectrum of energy donor with the excitation spectrum of the acceptor. The IR study of triptycene films deposited at 77 K reveals irreversible structural changes upon raising the temperature indicating a possible effect of recrystallization on the luminescence spectra. Refs 12. Figs 7. Tables 1.