The Photophysics of Dibenzo[a,j]phenazine

The photophysics of dibenzo[a,j]phenazine (DBPHZ) in solution was investigated by steady-state and time-resolved spectroscopy. The nature of the solvent (methanol, acetonitrile, dichloromethane and cyclohexane were considered) only weakly affects the photophysical properties. The first excited singlet state features a lifetime of the order of 1 ns. Its fluorescence emission is centered around 420 nm and occurs with moderate yields of approximate to 0.1. The lowest triplet state is populated with yields of approximate to 0.3. Quantum chemical computations suggest that a 3n pi* state energetically close to the primarily excited singlet state is responsible for the efficient intersystem crossing towards the triplet manifold.

Automated summary

The photophysics of DBPHZ in solution was studied through spectroscopic methods, showing that the solvent type has weak effects on the photophysical properties. The first excited singlet state has a short lifetime and moderate fluorescence yield, while the lowest triplet state is populated with higher yields. Quantum chemical computations suggest an efficient intersystem crossing mechanism towards the triplet manifold.