Bright persistent luminescence from pure organic molecules through a moderate intermolecular heavy atom effect.

ABSTRACT: Generally, strong phosphorescence always implies a short luminescence lifetime. So, pure organic molecules with strong persistent phosphorescence at room temperature are rarely explored. Here, a new strategy is used to explore strong persistent phosphorescence of carbazole derivatives through an intermolecular moderate heavy atom effect. Flexible alkyl chains were inserted between the heavy atom and carbazole moieties so as to avoid a strong internal heavy atom affect. The results indicate that the photoluminescence properties of crystals strongly depend on molecular stacking in crystal states. Moreover, seven molecules among eight carbazole derivatives exhibit persistent room-temperature phosphorescence in their crystals and the Φ_P values of three compounds exceed 9.5%.

SUBMITTER: Xue P 

PROVIDER: S-EPMC5625585 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature