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Multi-component smart organic materials (MCSOMs) with stimuli-chromic behaviors have attracted significant attention due to their easily switchable photophysical properties and advanced applications. This review highlights the latest developments in multi-component stimuli-chromic organic materials activated by various stimuli, including light, heat, mechanical force, vapor, pH, and chemicals. Herein, we discuss the design strategies, stimuli-chromic mechanisms, and their potential applications in fields such as information encryption, sensors, biological imaging, and green printing. Also, the review provides a detailed classification and discussion of exciting stimuli-chromic properties of stimuli-chromic MCSOMs. Lastly, the current achievements, limitations, key challenges, and future prospects are summarized and discussed. This review may inspire further innovative research on multi-component stimuli-responsive smart organic materials, thus fostering further development of smart materials and devices. [ABSTRACT FROM AUTHOR]

Smart materials based on stimuli-fluorochromic π-conjugated solids (SFCSs) have aroused significant interest due to their versatile and exciting properties, leading to advanced applications. In this review, we highlight the recent developments in SFCS-based smart materials, expanding beyond organometallic compounds and light-responsive organic luminescent materials, with a discussion on the design strategies, exciting properties and stimuli-fluorochromic mechanisms along with their potential applications in the exciting fields of encryption, sensors, data storage, display, green printing, etc. The review comprehensively covers single-component and multi-component SFCSs as well as their stimuli-fluorochromic behaviors under external stimuli. We also provide insights into current achievements, limitations, and major challenges as well as future opportunities, aiming to inspire further investigation in this field in the near future. We expect this review to inspire more innovative research on SFCSs and their advanced applications so as to promote further development of smart materials and devices. [ABSTRACT FROM AUTHOR]

Förster resonance energy transfer (FRET) plays a critical role in organic optoelectronic materials. However, developing facile and effective strategies to achieve high‐efficiency energy harvesting of chromophores with aggregation‐caused quenching (ACQ) remains an appealing yet challenging task, that has not yet been explored. Herein, a subtly strategy, crystallization‐induced precise co‐assembly (CIPCA) involving a molecular “lightening agent,” to effectively improve FRET efficiency of ACQ chromophores is developed. Bis(phenylethynyl)anthracene (BPA) and bis(phenylethynyl)naphthacene (BPN) with significant ACQ effect are chosen as representative FRET donor and acceptor, respectively, and weakly‐fluorescent octafluoronaphthalene (OFN) acted as the “lightening agent.” Thanks to precise co‐assembly with OFN, the PLQY of solid BPA is enhanced by 107%, and the BPN powder can be unprecedentedly lighted. More importantly, through such powerful CIPCA, the monotonous and weak emission for BPA@BPN can be remarkably regulated to colorful and much brighter ones with FRET efficiency improvement of as high as 180–270%. An in‐depth understanding of FRET regulation is elucidated through a precise correlation of the supramolecular structures and properties. Such achievements allow to successfully fabricate distinct multi‐stimuli‐responsive fluorescent patterns and highly‐emissive colorful flowers with high flexibility. This research provides an efficient strategy to improve the FRET efficiency of ACQ pairs. [ABSTRACT FROM AUTHOR]