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Cross-linking enhanced room-temperature phosphorescence of carbon dots

SmartMat 2022年第2期3卷 337-348页

作者： Boyang Wang Zhen Sun Jingkun Yu Geoffrey I.N.Waterhouse Siyu Lu Bai Yang Green Catalysis Center College of ChemistryZhengzhou UniversityZhengzhouChina School of Chemical Sciences The University of AucklandAucklandNew Zealand State Key Lab of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchunChina

Currently,there is a strong drive to discover alternative materials that exhibit room-temperature phosphorescence(RTP)for displays,bioimaging,and data ***,these materials should be nontoxic,cheap,and possess controllable photoluminescent *** dots(CDs)possess each of these characteristics,but to date,less attention has been paid to their RTP ***,we synthesized a series of CDs by self-crosslinking and carbonization of *** resultant CDs were luminescent and exhibited a bright,micro-second afterglow *** increase the RTP,a second microwave processing step was used to coat the CDs with polyvinyl alcohol(PVA),polyacrylamide(PAM),or tetraethyl orthosilicate(TEOS),producing CDs@PVA,CDs@PAM,and CDs@TEOS *** core-shell structure acted to enhance crosslinking at the surface of the CDs to boost the RTP,creating abundant energy levels for intersystem *** situ X-ray photoelectron spectroscopy verified electron transfer during ***,we present a design rule that can be used to tune the quantum yields and RTP lifetime of CDs,based on the effective stabilization of triplet excited states through the extent and strength of *** simple strategy provides a flexible route for guiding the further development of CDs with tailored RTP properties for various applications.

关键词： carbon dots crosslink-enhanced emission effect phosphorescence mechanism polymers room-temperature phosphorescence

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Aggregation and luminescence in carbonized polymer dots

Aggregate

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Aggregate 2022年第2期3卷 107-124页

作者： Chunyuan Kang Songyuan Tao Fan Yang Bai Yang State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchunP.R.China

The aggregate luminescence behavior of organic luminescent materials has been studied *** a new kind of luminescent nanomaterials,carbonized polymer dots(CPDs)not only inherit the stability and biocompatibility of carbon materials,but also possess the luminescence tunability,water solubility,and high photoluminescence quantum yield of organic luminescent materials,rendering them a strong candidate for the next generation of light-emitting ***,people mainly understood its luminescence from the perspective of carbon materials,but some luminescence mechanisms are still *** this review,we discuss the luminescence mechanism by referring to organic luminescent materials with emphasis on their aggregation ***,three representative aggregate luminescence phenomena of organic luminescent materials are briefly *** present in CPDs are elaborated to further discuss the potential interactions between them,with emphasis on the role of crosslinked polymer *** this basis,some special luminescence phenomena of CPDs in the aggregate state are summarized,and relevant mechanisms are discussed in detail to consolidate relevant statements.

关键词： aggregation-induced emission carbon dots carbonized polymer dots crosslink-enhanced emission effect luminescence

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