The development of photo-responsive room temperature phosphorescence(RTP)materials has attracted more and more attention for their broad application pro-spects.Until now,it is still difficult to obtain the related ma-terials with both high efficiency and long lifetime.And the lacking of emission in blue and red regions also largely re-stricts their further applications.In this work,we reported a new strategy to maintain both high efficiency and long lifetime in RTP luminogens through the integration of phenothiazine to facilitate n-π*transition and polycyclic aromatic hydro-carbons(PAHs)dominated byπ-π*transition.When they were doped into polymer matrix,full color photo-induced RTP materials were obtained for the changedπ-conjugation of PAHs.Among them,PTri@PVP showed the best RTP per-formance with phosphorescence efficiency of 20.73%and lifetime up to 819 ms.Specifically,after turning off the ul-traviolet-visible(UV)irradiation upon this system,time-de-pendent phosphorescence afterglow from green to blue was exhibited,which was found to originate from two distinct molecular conformations and could be further regulated by thermal stimulus.Accordingly,multiple anti-counterfeiting applications,including screen printing,multi-color patterns and multi-dimensional information encryption,were suc-cessfully demonstrated.
Jiayi LiangJie YangYunsheng WangMingda ShanZhenjiang LiuJia RenManman FangZhen Li
