摘要
有机室温磷光(RTP)材料在光电器件、生物成像、信息加密和防伪等领域极具应用前景,近年来获得了广泛关注.将纤维素转化为RTP材料可有效解决传统RTP材料合成复杂、成本高、难以大规模制备、加工性能低、缺乏可再生性及污染环境等一系列问题,同时为纤维素的高值化利用提供新途径.本文综述了纤维素基RTP材料的设计思路:纤维素中的杂原子或不饱和基团的簇聚自身可发射RTP,通过合理改性可增强其性能;纤维素中含有大量活性羟基,可形成氢键/共价键网络,提供刚性环境,是构建有机RTP材料的良好基质;纤维素可作为碳源转化为具有RTP性质的碳点(CDs).重点介绍了具有变色、刺激响应及圆偏振磷光等特殊磷光属性的纤维素基RTP材料体系,并讨论了其内在的构效关系及潜在应用价值,最后总结了纤维素基RTP材料在材料性能、功能性、应用方面的主要挑战并展望了未来发展前景.
Abstract
Organic room temperature phosphorescence(RTP)materials showed enormous application prospects in the fields of optoelectronic devices,bioimaging,information encryption and anti-counterfeiting,and had received extensive attention in recent years.Converting cellulose into RTP materials could effectively solve a series of problems of traditional RTP materials,such as complex synthesis,high cost,difficulty in large-scale preparation,low processing performance,lack of renewability and environmental pollution,and provided a new way for the high-value utilization of cellulose at the same time.This paper reviewed the design ideas of cellulose-based RTP materials,the aggregation of heteroatoms or unsaturated groups in cellulose that could emit RTP by themselves,and their properties that could be enhanced by reasonable modification.Cellulose contains a large number of active hydroxyl groups,which can form hydrogen bond/covalent bond networks,and provides a rigid environment,which is served as a good matrix for the construction of organic RTP materials.Cellulose could be converted into carbon dots(CDs)with RTP properties as a carbon source.The cellulose-based RTP systems with special phosphorescent properties such as color-changing,stimulus-responsive,and circularly polarized phosphorescence were mainly introduced,and their intrinsic structure-activity relationships and potential applications were also discussed.Finally,the key challenges of cellulose-based RTP materials in terms of material properties,functionality and applications were summarized and the future development prospects were prospected.
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