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Reversible Mechanochromic Delayed Fluorescence in 2D Metal–Organic Micro/Nanosheets: Switching Singlet–Triplet States through Transformation between Exciplex and Excimer
Advanced Science ( IF 14.3 ) Pub Date : 2018-09-27 , DOI: 10.1002/advs.201801187 Yongsheng Yang 1, 2 , Xiaogang Yang 1 , Xiaoyu Fang 1 , Ke-Zhi Wang 1 , Dongpeng Yan 1, 3
Advanced Science ( IF 14.3 ) Pub Date : 2018-09-27 , DOI: 10.1002/advs.201801187 Yongsheng Yang 1, 2 , Xiaogang Yang 1 , Xiaoyu Fang 1 , Ke-Zhi Wang 1 , Dongpeng Yan 1, 3
Affiliation
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Mechanochromic luminescent materials have attracted much attention and present a variety of applications in information security, data recording, and storage devices. However, most of these smart luminescent systems are based on typical fluorescence and/or phosphorescence mechanisms; the mechanochromic delayed fluorescence (MCDF) materials involving switching singlet and triplet states are rarely studied to date. Herein, new 2D layered metal–organic micro/nanosheets, [Cd(9‐AC)2(BIM)2] (named as MCDF‐1; 9‐AC = anthracene‐9‐carboxylate and BIM = benzimidazole) and its solvate form containing interlayer CH3CN (named as MCDF‐2), which exhibit reversible mechanochromic delayed fluorescence characteristics, are presented. With applying the mechanical force, the luminescent center of MCDF‐1 can be converted from 9‐AC/BIM exciplex to 9‐AC/9‐AC excimer, resulting in alternations of delayed fluorescence. Such luminescent change can be further recovered by CH3CN fumigation, accompanied by the structural transformation from MCDF‐1 to MCDF‐2. Furthermore, the force‐responsive process also refers to the energy redistribution between singlet and triplet states as inferred by both temperature‐dependent photophysics and theoretical calculations. Therefore, this work not only develops new 2D micro/nanosheets as MCDF materials, but also supplies a singlet–triplet energy switching mechanism on their reversible mechanochromic process.
中文翻译：
二维金属有机微米/纳米片中的可逆力致变色延迟荧光：通过激基复合物和准分子之间的转换切换单线态-三线态
力致变色发光材料引起了人们的广泛关注，并在信息安全、数据记录和存储设备等领域有着广泛的应用。然而，大多数这些智能发光系统都是基于典型的荧光和/或磷光机制；迄今为止，涉及单线态和三线态转换的力致变色延迟荧光（MCDF）材料的研究很少。在此，新型二维层状金属有机微/纳米片，[Cd(9-AC) 2 (BIM) 2 ]（命名为MCDF-1；9-AC = 蒽-9-羧酸盐和BIM = 苯并咪唑）及其溶剂化物形式提出了含有中间层CH 3 CN（称为MCDF-2）的材料，其表现出可逆的力致变色延迟荧光特性。通过施加机械力，MCDF-1的发光中心可以从9-AC/BIM激基复合物转变为9-AC/9-AC准分子，导致延迟荧光的交替。这种发光变化可以通过CH 3 CN熏蒸进一步恢复，伴随着从MCDF-1到MCDF-2的结构转变。此外，力响应过程还指通过温度依赖性光物理学和理论计算推断出的单重态和三重态之间的能量重新分配。因此，这项工作不仅开发了新型二维微/纳米片作为MCDF材料，而且还为其可逆力致变色过程提供了单线态-三线态能量转换机制。
更新日期：2018-09-27
中文翻译：
二维金属有机微米/纳米片中的可逆力致变色延迟荧光：通过激基复合物和准分子之间的转换切换单线态-三线态
力致变色发光材料引起了人们的广泛关注，并在信息安全、数据记录和存储设备等领域有着广泛的应用。然而，大多数这些智能发光系统都是基于典型的荧光和/或磷光机制；迄今为止，涉及单线态和三线态转换的力致变色延迟荧光（MCDF）材料的研究很少。在此，新型二维层状金属有机微/纳米片，[Cd(9-AC) 2 (BIM) 2 ]（命名为MCDF-1；9-AC = 蒽-9-羧酸盐和BIM = 苯并咪唑）及其溶剂化物形式提出了含有中间层CH 3 CN（称为MCDF-2）的材料，其表现出可逆的力致变色延迟荧光特性。通过施加机械力，MCDF-1的发光中心可以从9-AC/BIM激基复合物转变为9-AC/9-AC准分子，导致延迟荧光的交替。这种发光变化可以通过CH 3 CN熏蒸进一步恢复，伴随着从MCDF-1到MCDF-2的结构转变。此外，力响应过程还指通过温度依赖性光物理学和理论计算推断出的单重态和三重态之间的能量重新分配。因此，这项工作不仅开发了新型二维微/纳米片作为MCDF材料，而且还为其可逆力致变色过程提供了单线态-三线态能量转换机制。
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