On the Nonconfirmation of the Dual Emission Properties of Biphenylene

Abstract
It is shown that the previously reported dual emission properties of biphenylene are most likely caused by an impurity that absorbs around 2800 Å, and emits fluorescence at 3000 Å and phosphorescence at 4100 Å. The first two electronically excited states of biphenylene are discussed briefly in terms of low‐temperature mixed‐crystal studies in polarized light.