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 � 0.1. The lowest triplet state is populated with yields of � 0.3. Quantum chemical computations suggest that a 3 np * state energetically close to the primarily excited singlet state is responsible for the efficient intersystem crossing towards the triplet manifold.
The front cover artwork is provided by the research groups of Peter Gilch, Oliver Weingart (both HHU Düsseldorf, Germany) and Youhei Takeda (Osaka University, Japan). The image shows a comic style artwork of Kristoffer Thom – the first author of the paper – explaining the results of the study with the help of a blackboard. Read the full text of the Article at 10.1002/cptc.2020000250.
The Front Cover depicts the first author Kristoffer Thom explaining, with the aid of a blackboard, the results of a collaboration between HHU Düsseldorf (Germany) and Osaka University (Japan) on the photophysics of dibenzo[a,j]phenazine. This compound is of great interest for organic electronics and photonics. More information can be found in the Article by Oliver Weingart, Youhei Takeda, Peter Gilch and co‐workers.
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