Quadruple Anticounterfeiting Encryption: Anion-Modulated Forward and Reverse Excitation-Dependent Multicolor Afterglow in Two-Component Ionic Crystals,ACS Applied Materials & Interfaces

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Quadruple Anticounterfeiting Encryption: Anion-Modulated Forward and Reverse Excitation-Dependent Multicolor Afterglow in Two-Component Ionic Crystals
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-06-22 , DOI: 10.1021/acsami.2c08379
Guowei Xiao ₁ , Yu-Juan Ma ₁ , Xiaoyu Fang ₁ , Dongpeng Yan ₁

Affiliation

Molecule-based afterglow materials with ultralong-lived excited states have attracted great attention owing to their unique applications in light-emitting devices, information storage, and anticounterfeiting. Herein, a series of new types of two-component ionic crystalline materials were fabricated by the self-assembly of cytosine and different anions under ambient conditions. The multiple intermolecular interactions of cytosine with phosphate and halogens anions can lead to abundant energy levels and different crystal stacking modes to control molecular aggregation and excited-state intermolecular proton transfer (ESIPT) process. Interestingly, H-aggregation-induced green to yellow room-temperature phosphorescence (RTP) and ESIPT-dominated cyan RTP to deep blue thermally activated delayed fluorescence (TADF) emission can be generated by tuning excitation wavelength, time evolution, and temperature. Furthermore, the combination of two-component ionic crystals can be used as multicolored candidates for quadruple information encryption. Therefore, this work not only develops an anion-modulated strategy to achieve color-tunable afterglow from both static and dynamic fashions but also provides a guideline for designing forward/reverse excitation-dependent luminescent materials.

中文翻译：

四重防伪加密：双组分离子晶体中的阴离子调制正向和反向激发依赖的多色余辉

具有超长寿命激发态的分子基余辉材料由于其在发光器件、信息存储和防伪等方面的独特应用而备受关注。在此，通过胞嘧啶和不同阴离子在环境条件下的自组装制备了一系列新型双组分离子晶体材料。胞嘧啶与磷酸根和卤素阴离子的多种分子间相互作用可导致丰富的能级和不同的晶体堆叠模式来控制分子聚集和激发态分子间质子转移 (ESIPT) 过程。有趣的是，通过调节激发波长、时间演化和温度，可以产生 H 聚集诱导的绿色至黄色室温磷光 (RTP) 和以 ESIPT 为主的青色 RTP 至深蓝色热激活延迟荧光 (TADF) 发射。此外，双组分离子晶体的组合可用作四重信息加密的多色候选。因此，这项工作不仅开发了一种阴离子调制策略，以实现静态和动态模式的颜色可调余辉，而且还为设计正向/反向激发相关的发光材料提供了指导。

更新日期：2022-06-22

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