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<p>Room-temperature phosphorescence (RTP) materials play a vital role in security domain due to their unique optical properties. However, most average lifetimes of available RTP materials remain less than 1 s in aqueous-phase media, which is unfavorable to practical applications. Herein, an <i>ex-situ</i> covalent coupling strategy is proposed to fabricate liquid-phase long-lived RTP materials by combining SiO<sub>2</sub> microspheres with the feather-derived carbon dots (CDs). Astonishingly, the aqueous dispersion of the resulting CDs@SiO<sub>2</sub> microspheres exhibits a lifetime of up to 2.38 s with an absolute quantum yield of 22%. Moreover, the average lifetime of the solid CDs@SiO<sub>2</sub> is as long as 3.04 s, which is superior to that of existing RTP carbon-based materials. The striking enhancements in the RTP of the CDs@SiO<sub>2</sub> composites are mainly attributed to the immobilization of the formed Si–O–C covalent bonds and Si–O–Si rigid networks. The CDs@SiO<sub>2</sub> composites were subsequently applied in the fields of information encryption and anti-fake. Interestingly, the CDs@SiO<sub>2</sub> composites possess intriguing, reversible and stable optical properties, including water-responsive structural colors, blue fluorescence and cyan RTP, exhibiting excellent covert performance in applications of information encryption and decryption, and high-level anticounterfeiting. These findings provide not only a straightforward strategy for developing multiresponsive optical materials but also a more secure anticounterfeiting technology.</p>

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Water-unquenchable ultralong room-temperature phosphorescent CDs@SiO2 composites for information encryption and anticounterfeiting applications

  • 期刊论文

  • 发表日期：

    2025年7月11日

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  • Yuanfen Huang,
  • Xiaoyuan Zhang,
  • Jiajia Kong,
  • Yanqing Liu,
  • Xin Liu,
  • Dongzhi Chen

摘要

Room-temperature phosphorescence (RTP) materials play a vital role in security domain due to their unique optical properties. However, most average lifetimes of available RTP materials remain less than 1 s in aqueous-phase media, which is unfavorable to practical applications. Herein, an ex-situ covalent coupling strategy is proposed to fabricate liquid-phase long-lived RTP materials by combining SiO2 microspheres with the feather-derived carbon dots (CDs). Astonishingly, the aqueous dispersion of the resulting CDs@SiO2 microspheres exhibits a lifetime of up to 2.38 s with an absolute quantum yield of 22%. Moreover, the average lifetime of the solid CDs@SiO2 is as long as 3.04 s, which is superior to that of existing RTP carbon-based materials. The striking enhancements in the RTP of the CDs@SiO2 composites are mainly attributed to the immobilization of the formed Si–O–C covalent bonds and Si–O–Si rigid networks. The CDs@SiO2 composites were subsequently applied in the fields of information encryption and anti-fake. Interestingly, the CDs@SiO2 composites possess intriguing, reversible and stable optical properties, including water-responsive structural colors, blue fluorescence and cyan RTP, exhibiting excellent covert performance in applications of information encryption and decryption, and high-level anticounterfeiting. These findings provide not only a straightforward strategy for developing multiresponsive optical materials but also a more secure anticounterfeiting technology.