首页|A host-guest organic afterglow system with significant guest induced enhancement of phosphorescence
A host-guest organic afterglow system with significant guest induced enhancement of phosphorescence
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NSTL
In this article,an effective host-guest system with intense afterglow and stimuli-responsive properties is described.Br-BID-Py(host)crystals emit weak phosphorescence and NMe2-BID-Py(guest)crystals are not phosphorescent.However,when NMe2-BID-Py is doped into the Br-BID-Py crystals,the afterglow of the host is enhanced.The afterglow exhibits a unique thermally activated property,which is due to the effective intersystem crossing from the guest to the host via energy transfer.Br-BID-Py(host)and NMe2-BID-Py(guest)show small structural differences,which facilitate energy transfer with each other in the crystal state.The energy transfer process is evidenced by excitation photoluminescence spectra and UV-vis absorption spectra.To date,the host-guest afterglow organic system where the guest enhances the intrinsic afterglow of the host is rarely reported.Moreover,both Br-BID-Py and NMe2-BID-Py display stimuli-responsive properties because of protonation of pyridine,which is inherited by the hybrid host-guest crystals.The host-guest crystals demonstrate rare proton-induced afterglow shift observed by direct visualization by eye.Finally,the application of the host-guest afterglow material and its stimulus-responsive property in information encryption is displayed.To our best knowledge,this example is a rare stimulus-responsive organic afterglow material fabricated via the strategy of a host-guest doping system.
Stimulus-responsive propertyOrganic afterglowHost-guest dopingThermal activationEnergy transfer
Jiayao Sun、Chen Qian、Zhimin Ma
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Beijing Advanced Innovation Center for Soft Matter Science and Engineering,College of Chemical Engineering,Beijing State Key Laboratory of Organic-Inorganic Composites,College of Chemical Engineering,Beijing University of Chemical Technology,Beijing,100029,China
College of Engineering,Peking University,Beijing,100871,China
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