Time-resolved emission studies of poly(n-v1nyl carbazole) using pulsed laser excitation

Time-resolved fluorescence spectroscope of poly(N-vinyl carbazole) in tetrahydrofuran solution has revealed the presence of three emitting species, namely a normal excimer emitting at λ_max = 420 nm, a higher-energy excimer site at λ_max = 370 nm which interconverts with the “normal” site, and a third species which emits at 370 nm but not at 420 nm. and which does not convert to the normal excimer. The identity of this species, and the kinetics of fluorescence of the polymer, are discussed.