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Reversible switching of solid-state luminescence by heat-induced interconversion of molecular packing†
Molecular Systems Design & Engineering ( IF 3.6 ) Pub Date : 2017-10-23 00:00:00 , DOI: 10.1039/c7me00089h
Karattu Chali Naeem 1, 2, 3, 4, 5 , Vijayakumar C. Nair 1, 2, 3, 4, 5
Affiliation  

Dynamic switching of solid-sate luminescence with high contrast and reproducibility is a challenging task but important for several optoelectronic applications. One promising approach towards this end is to control the mode of solid-state packing of luminescent organic chromophores with an external stimulus. Herein, we present the heat-induced interconversion of molecular packing in acceptor–donor–acceptor type divinylbenzene derivatives. This interconversion is associated with the switching of solid-state luminescence from red to greenish-yellow (Δλ = 95 nm). A detailed investigation of the photophysical properties provided molecular and supramolecular level comprehension of the factors guiding the luminescence switching. The transition between different packing modes is associated with differential excited state coupling and excitation energy migration efficiencies due to the variance in the chromophore organization. Viewed more broadly, our findings illustrate that subtle control over energy migration processes in molecular assemblies by heating may result in functional organic materials with switchable luminescence.

中文翻译:

通过热诱导的分子堆积相互转换可逆转换固态发光

具有高对比度和可再现性的固态发光的动态切换是一项艰巨的任务,但对几种光电应用而言很重要。为此目的,一种有希望的方法是利用外部刺激来控制发光有机发色团的固态堆积模式。在这里,我们介绍了受主-供主-受主类型二乙烯基苯衍生物中分子堆积的热诱导互变。这种互变与固态发光的切换相关联从红色到绿色的黄色(Δ λ= 95 nm)。对光物理性质的详细研究提供了指导发光转换的分子和超分子水平的理解。由于生色团组织的变化,不同堆积模式之间的过渡与微分激发态耦合和激发能迁移效率有关。从更广泛的角度来看,我们的发现表明,通过加热对分子组件中的能量迁移过程进行微妙的控制可能会导致功能有机材料具有可切换的发光。
更新日期:2017-10-23
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