【摘 要】
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Near-infrared(NIR),particularly NIR-containing dual-/multi-mode afterglow,is very attractive in many fields of application,but it is still a great challenge to achieve such property of materials.Herein,we report a facile method to prepare green and NIR du
【机 构】
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College of Chemistry,Zhengzhou University,Zhengzhou 450001,People’s Republic of China;International
论文部分内容阅读
Near-infrared(NIR),particularly NIR-containing dual-/multi-mode afterglow,is very attractive in many fields of application,but it is still a great challenge to achieve such property of materials.Herein,we report a facile method to prepare green and NIR dual-mode afterglow of carbon dots(CDs)through in situ embedding o-CDs(being prepared from o-phe-nylenediamine)into cyanuric acid(CA)matrix(named o-CDs@CA).Further studies reveal that the green and NIR afterglows of o-CDs@CA originate from thermal activated delayed fluorescence(TADF)and room temperature phosphorescence(RTP)of o-CDs,respectively.In addition,the formation of covalent bonds between o-CDs and CA,and the presence of multiple fixation and rigid effects to the triplet states of o-CDs are confirmed to be critical for activating the observed dual-mode afterglow.Due to the shorter lifetime and insensitiveness to human vision of the NIR RTP of o-CDs@CA,it is com-pletely covered by the green TADF during directly observing.The NIR RTP signal,however,can be readily captured if an optical filter(cut-off wavelength of 600 nm)being used.By utilizing these unique features,the applications of o-CDs@CA in anti-counterfeiting and information encryption have been demonstrated with great confidentiality.Finally,the as-developed method was confirmed to be applicable to many other kinds of CDs for achieving or enhancing their afterglow performances.
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