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<p>As the market demand for green fluorescent materials with tunable emission performance continues to grow, traditional fluorescent materials exhibit inherent performance limitations, necessitating the development of novel luminescent materials with adjustable optical properties. In this work, carbon nitride materials with different carbon doping ratios [(C₄H₇N₅)ₓ-CN] (x = 0, 0.1, 0.3, 0.5) were synthesized via a one-pot strategy. The as-prepared (C₄H₇N₅)ₓ-CN was further introduced into waterborne polyurethane (WPU) molecular chains as a chain extender through a modified acetone method, and a series of fluorescent-tunable (C₄H₇N₅)ₓ-CN-WPU composites (x = 0, 0.1, 0.3, 0.5) were successfully fabricated. Structural and morphological characterizations confirm that (C₄H₇N₅)ₓ-CN is chemically bonded to WPU molecular chains, forming a uniformly dispersed composite system. By regulating the doping content of (C₄H₇N₅)ₓ-CN, the fluorescence emission wavelength of (C₄H₇N₅)ₓ-CN-WPU can be continuously modulated from 440&#xa0;nm to 491&#xa0;nm, achieving emission color transition from blue to green; meanwhile, the maximum enhancement of fluorescence lifetime reaches 112 ns. The obtained composites showed T₅% values above 250&#xa0;°C, suggesting acceptable initial thermal stability.The corresponding emulsion shows a Zeta potential absolute value higher than 40 mV and exhibits excellent storage stability without obvious agglomeration after 6 months of room-temperature storage. Using water as the dispersion medium, the prepared (C₄H₇N₅)ₓ-CN-WPU integrates tunable fluorescence behavior, good thermal stability and aqueous dispersion compatibility. This work provides a feasible synthetic strategy and candidate material for the application of WPU-based fluorescent composites in optoelectronic devices, bioimaging and anti-counterfeiting fields.</p>

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A fluorescent-tunable waterborne polyurethane modified by carbon-doped carbon nitride

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Shicong Pei,
  • Zhuqing Li,
  • Mengwei Sun,
  • Zihan Wang,
  • Gaosheng Chen,
  • Mingdi Yang,
  • Yuxi Xian,
  • Yunsheng Ding,
  • Xianhai Hu

摘要

As the market demand for green fluorescent materials with tunable emission performance continues to grow, traditional fluorescent materials exhibit inherent performance limitations, necessitating the development of novel luminescent materials with adjustable optical properties. In this work, carbon nitride materials with different carbon doping ratios [(C₄H₇N₅)ₓ-CN] (x = 0, 0.1, 0.3, 0.5) were synthesized via a one-pot strategy. The as-prepared (C₄H₇N₅)ₓ-CN was further introduced into waterborne polyurethane (WPU) molecular chains as a chain extender through a modified acetone method, and a series of fluorescent-tunable (C₄H₇N₅)ₓ-CN-WPU composites (x = 0, 0.1, 0.3, 0.5) were successfully fabricated. Structural and morphological characterizations confirm that (C₄H₇N₅)ₓ-CN is chemically bonded to WPU molecular chains, forming a uniformly dispersed composite system. By regulating the doping content of (C₄H₇N₅)ₓ-CN, the fluorescence emission wavelength of (C₄H₇N₅)ₓ-CN-WPU can be continuously modulated from 440 nm to 491 nm, achieving emission color transition from blue to green; meanwhile, the maximum enhancement of fluorescence lifetime reaches 112 ns. The obtained composites showed T₅% values above 250 °C, suggesting acceptable initial thermal stability.The corresponding emulsion shows a Zeta potential absolute value higher than 40 mV and exhibits excellent storage stability without obvious agglomeration after 6 months of room-temperature storage. Using water as the dispersion medium, the prepared (C₄H₇N₅)ₓ-CN-WPU integrates tunable fluorescence behavior, good thermal stability and aqueous dispersion compatibility. This work provides a feasible synthetic strategy and candidate material for the application of WPU-based fluorescent composites in optoelectronic devices, bioimaging and anti-counterfeiting fields.