Key Takeaways & Executive Findings
- •• • Single-fluorophore MFPMs eliminate the need for multiple chromophores, reducing synthesis complexity and purification steps, as evidenced by the review's focus on recent advances (e.g., refs. 136-137). • • Color conversion mechanisms such as AIE, ESIPT, and TICT enable emission tuning across the visible spectrum, with examples showing ratiometric emission changes in supramolecular adhesive gels (ref. 136). • • The strategy has been applied in anti-counterfeiting and encryption, with high-contrast color/fluorescence dual-mode stimuli-responsive polymers achieving stable performance (ref. 124). • • Dynamic lanthanide coordination allows finely manipulated room temperature phosphorescence, enabling multi-level information security (ref. 126).
Abstract
Multicolor fluorescent polymer materials (MFPMs) are of significant value in biomaterials and display technologies due to their rich color palette. Traditional construction methods rely on incorporating multiple fluorescent molecules of different colors, which introduces complexities in structural design, synthesis, purification, and practical operability. To overcome these challenges, a strategy employing a single fluorophore that exhibits multiple fluorescent colors has been developed and integrated into MFPMs. This approach has advanced fields such as information anti-counterfeiting and optoelectronic materials. This review summarizes recent developments in MFPMs based on a single fluorescent molecule, elucidates preparation methods and color conversion mechanisms, and analyzes application prospects. Key mechanisms include aggregation-induced emission (AIE), excited-state intramolecular proton transfer (ESIPT), and twisted intramolecular charge transfer (TICT), which enable color tuning through environmental stimuli or assembly. The review highlights the potential of this strategy to simplify fabrication processes while achieving tunable emission colors. It provides guidance for designing novel multicolor fluorescent materials and fosters progress in fluorescent materials, polymer science, and materials science.
1. Introduction
Traditional organic fluorescent materials, such as rhodamine and coumarin, suffer from aggregation-caused quenching (ACQ), which suppresses emission in the solid or aggregated state, limiting their practical use. The discovery of aggregation-induced emission (AIE) by Tang's group in 2001 overcame this drawback, enabling intense fluorescence in aggregates. However, most AIE systems emit a single color, which is insufficient for applications requiring multiple emission colors, such as multiplexed bioimaging and anti-counterfeiting. Conventional multicolor systems rely on blending multiple fluorophores, leading to complex synthesis, purification, and potential energy transfer issues.
This review addresses the bottleneck by focusing on single-fluorophore systems that exhibit multicolor emission through environmental responsiveness or supramolecular assembly. By leveraging mechanisms like AIE, ESIPT, and TICT, these systems achieve color tunability without the need for multiple chromophores. This approach simplifies material fabrication and enhances operational flexibility, making it attractive for scalable production and advanced applications. The review systematically summarizes recent progress, preparation methods, and color conversion mechanisms, offering a roadmap for designing next-generation multicolor fluorescent polymers.
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LI Qingyun, LU Anji, LYU Yongli, JI Xiaofan (2026). Construction of Multicolor Fluorescent Polymer Materials Based on a Single Fluorophore. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-4013-y
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Frequently Asked Questions
What are the main mechanisms enabling a single fluorophore to emit multiple colors, and how do they compare in terms of color tunability and environmental sensitivity?
The primary mechanisms include AIE, ESIPT, and TICT. AIE induces emission upon aggregation, with color changes depending on molecular packing. ESIPT involves excited-state proton transfer, leading to large Stokes shifts and dual emission. TICT results in twisted intramolecular charge transfer, producing red-shifted emission in polar environments. Each offers distinct tunability: AIE is sensitive to aggregation state, ESIPT to pH or solvent, and TICT to polarity. The choice depends on desired application and environmental stimuli.
How does the single-fluorophore strategy reduce synthesis complexity compared to traditional multi-fluorophore approaches?
Traditional approaches require synthesizing and purifying multiple distinct fluorophores, each with its own structural design and compatibility issues. The single-fluorophore strategy uses one molecular entity, simplifying synthesis to a single route, reducing purification steps, and avoiding potential energy transfer or phase separation problems. This streamlines production and lowers cost, as highlighted in the review's rationale.
What are the practical limitations of single-fluorophore MFPMs in terms of photostability and quantum yield, and how do they compare to multi-fluorophore systems?
Single-fluorophore systems can exhibit high quantum yields, especially in AIE-active molecules, but photostability may vary. The review does not provide specific comparative data, but it notes that dynamic lanthanide coordination can achieve finely manipulated room temperature phosphorescence, suggesting potential for high stability. However, further studies are needed to benchmark against multi-fluorophore systems.
Can the single-fluorophore approach be scaled up for industrial production, and what are the key bottlenecks?
Scalability depends on the synthesis route and the stability of the fluorophore under processing conditions. The review emphasizes simplified synthesis, which is favorable for scale-up. Key bottlenecks include ensuring uniform color emission in large-scale batches and maintaining performance in polymer matrices. The use of supramolecular assembly may require precise control of host-guest interactions, which could be challenging at scale.
What are the most promising application areas for single-fluorophore MFPMs, and what performance metrics are critical for adoption?
Promising areas include anti-counterfeiting, encryption, and optoelectronic devices. Critical metrics include emission color purity, quantum yield, photostability, and response time to stimuli. For anti-counterfeiting, high contrast and dual-mode responses are essential, as demonstrated by poly(imino sulfone) systems (ref. 124). For optoelectronics, efficiency and color gamut are key.
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