Abstract：
Development of luminescent segmented heterostructures featuring multiple spatial-responsive blocks is important to achieve miniaturized photonic barcodes toward anti-counterfeit applications. Unfortunately, dynamic manipulation of the spatial color at micro/nanoscale still remains a formidable challenge. Here, a straightforward strategy is proposed to construct spatially varied heterostructures through amplifying the conformation-driven response in flexible lanthanide-metal-organic frameworks (Ln-MOFs), where the thermally induced minor conformational changes in organic donors dramatically modulate the photoluminescence of Ln acceptors. Notably, compositionally and structurally distinct heterostructures (1D and 2D) are further constructed through epitaxial growth of multiple responsive MOF blocks benefiting from the isomorphous Ln-MOF structures. The thermally controlled emissive colors with distinguishable spectra carry the fingerprint information of a specific heterostructure, thus allowing for the effective construction of smart photonic barcodes with spatially responsive characteristics. The results will deepen the understanding of the conformation-driven responsive mechanism and also provide guidance to fabricate complex stimuli-responsive hierarchical microstructures for advanced optical recording and high-security labels.
摘要：
具有多个空间响应块的发光分段异质结构的开发对于实现针对防伪应用的小型化光子条形码是重要的。不幸的是,在微/纳米尺度的空间颜色的动态操纵仍然是一个巨大的挑战。这里,提出了一种简单的策略，通过放大柔性镧系元素-金属-有机框架（Ln-MOFs）中的构象驱动响应来构建空间变化的异质结构，其中有机供体中热诱导的微小构象变化会极大地调节Ln受体的光致发光。值得注意的是,通过受益于同晶Ln-MOF结构的多个响应性MOF嵌段的外延生长，进一步构建了成分和结构上不同的异质结构（1D和2D）。具有可区分光谱的热控制发射颜色携带特定异质结构的指纹信息，从而允许有效构建具有空间响应特性的智能光子条形码。结果将加深对构象驱动响应机制的理解，并为制造用于高级光学记录和高安全性标签的复杂刺激响应分层微结构提供指导。
