Covalent organic polymers with solid-state dual-color fluorescence tunable by ultraviolet irradiation

Abstract

An aldol condensation-based strategy is developed for preparing covalent organic polymers (COPs) with strong solution and solid-state dual fluorescence. Moreover, the fluorescence property can be facilely tuned by two ways:...

Multistep Continuous Synthesis of a Highly Fluorescent Tröger’s Base-Derived Benzoxazine: Its Thermal Conversion into Intrinsic Microporosity Polymers

“…Fluorescent materials in the solid state hold paramount importance across diverse domains due to their versatile properties. 93,94 These materials serve a crucial role in optical applications such as LED technology and displays, facilitating the development of bright and efficient lighting systems. 95 Moreover, they assume a pivotal function in the fields of biomedical imaging, medication administration, and chemical sensing, hence facilitating diagnostics and monitoring of biological mechanisms.…”

“…Fluorescent materials in the solid state hold paramount importance across diverse domains due to their versatile properties. , These materials serve a crucial role in optical applications such as LED technology and displays, facilitating the development of bright and efficient lighting systems . Moreover, they assume a pivotal function in the fields of biomedical imaging, medication administration, and chemical sensing, hence facilitating diagnostics and monitoring of biological mechanisms. − The distinctive luminous characteristics of these substances are employed in security measures to combat counterfeiting, while their inclusion in materials science investigations helps to advance novel materials with customized properties.…”

“Eliminating the False and Preserving the True”: An Discussion on the Experiment of a Covalent Organic Polymer Fluorescence AntiCounterfeiting Material

“…2.1 引导学生获取相关背景知识，形成完备的理论体系 提示：荧光的起源、荧光产生的机理、荧光材料的种类及特点、荧光材料在生活中的应用及意义。 指导学生学会查阅文献，获取相关背景知识，了解荧光的起源、荧光产生的机理，形成完备的 理论体系。荧光材料主要分为无机荧光材料和有机荧光材料，其中无机荧光材料以掺杂稀土元素的 荧光材料为代表，以碱土金属作为基质，稀土元素作为激活剂，具有丰富的能级和4f电子跃迁特性， 转化率高，但稀土元素成本高，金属基质生物毒害性大，同时带来环境污染，且难以灵活设计 [2] 。有 机荧光材料中，有机小分子种类多，易设计调整发光性质，但在固态易发生荧光猝灭现象，而高分 子聚合物内部空隙的存在能对发光物质的发光性能产生影响，对发光强度、发光效率有所促进，还 可以抑制荧光淬灭现象。有机高分子荧光材料又分为接入发光基团的侧链型、全共轭主链型和部分 共轭主链型。有机荧光聚合物的开发对获得性能良好、环境友好的荧光材料具有重要意义。 如今，荧光材料在化学、生物和医学等领域已经引起广泛关注，如：传感检测、生物成像、药 物示踪、光电装置、防伪加密等荧光技术已被广泛应用 [3][4][5][6][7][8] 。其中，随着科技的日益发展，信息安全 在人们的日常生活和工作中显得越来越重要。而伪劣品也已经不再局限于品牌性、易于伪造的产品， 而已经遍及制药、食品、饮料、玩具、医疗设备和汽车零件等各个领域。目前，伪造依然是世界各 地的公司、政府和消费者面临的最严峻的问题之一。因此，信息加密和防伪技术在减少经济损失、 保障公共安全方面发挥着重要作用。发光材料因其高隐蔽性、易操作、高通量、设计方便等优点而 受到广泛关注，成为加密防伪领域不可缺少的材料。刺激致色(光致色、水致色、热致色)和光致发光 (荧光、磷光)化合物是开发安全性高、认证速度快的信息加密技术最适用的材料，可以达到高安全性 和高效性。由于荧光材料能够在紫外灯照射下显示高强度的明亮荧光发射，在防伪应用中得到了广 泛的关注 [7,8] [2] Shamsi, J.; Urban, A. S.; Imran, M.; De, T. L.; Manna, L. Chem. Rev.…”

A fluorescent sp2c-covalent organic polymer with an aggregation-induced emission unit to suppress aggregation-induced quenching for sensing furazolidone

“…15,16 In addition, they can interact well with other molecules through non-covalent interactions, so they can be widely used in gas separation and storage, energy storage, catalysis, energy conversion and sensing. 17,18 Compared with metal-organic frameworks (MOFs), 19 COPs connected by covalent bonds have higher stability. In addition, COPs are metal-free materials with excellent biocompatibility and low biotoxicity.…”