Inside Back Cover: Fast and Tunable Phosphorescence from Organic Ionic Crystals (Angew. Chem. Int. Ed. 36/2023).

In their Research Article (e202305108), Andreas Steffen, Andrey Belyaev, Pi-Tai Chou, Igor O. Koshevoy et al. show that the anion- interactions in crystalline diphosphonium iodides induce unusually fast room temperature triplet emission, which is associated with the external heavy atom effect and anion- charge-transfer character of the excited states. Anion- Interactions, Charge Transfer, Crystal Engineering, Phosphonium Salt, Phosphorescence Keywords: Anion- Interactions; Charge Transfer; Crystal Engineering; Phosphonium Salt; Phosphorescence EN Anion- Interactions Charge Transfer Crystal Engineering Phosphonium Salt Phosphorescence 1 1 1 09/01/23 20230904 NES 230904 B Harvesting organic phosphorescence b is essential for many fields in energy and materials sciences related to light generation. [Extracted from the article]