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 dibenzo[a,j]phenazine (DBPHZ) in solution was studied using steady-state and time-resolved spectroscopy. The solvent nature has a weak effect on the photophysical properties. The first excited singlet state has a lifetime of around 1 ns, fluorescence emission at 420 nm with a yield of about 0.1, and the lowest triplet state is populated with a yield of about 0.3. Quantum chemical computations suggest that an energetically close 3n pi* state is responsible for efficient intersystem crossing towards the triplet manifold.