Cocrystallization Boosted Performance of Room Temperature Phosphorescence Afterglows from Pure Organics
Pure organic materials with persistent room-temperature phosphorescent(p-RTP)have attracted extensive attention due to their unique photophysical properties,low cost,design flexibility,and promising applications in such areas as biomedical imaging,disease diagnosis and treatment,sensing,and anti-counterfeiting encryption.Achieving efficient,long-lived,and tunable p-RTP afterglows,however,remains a significant challenge.Herein,inspired by the clustering-triggered emission(CTE)mechanism,utilizing the cocrystallization strategy,cocrystals with stoichiometric ratio of 1∶1 were prepared by employing melamine(MA)and cyclic acylureas of hydantoin(HA)and dihydrouracil(DHU)as electron donor and acceptors,respectively.Compared to the single-component crystals of MA,HA,and DHU,the cocrystals exhibited better color-tunability and longer lifetimes for p-RTP emissions,which are attributable to the synergistic effects of the widespread presence of C=O groups,lone pair electrons,multiple hydrogen bonds,appropriate charge transfer,and multiple emissive clusters.Furthermore,advanced anti-counterfeiting and encryption applications of these cocrystalss were demonstrated.
persistent room temperature phosphorescenceafterglowscocrystallizationclustering-triggered emission
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