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Molecular vibration assisted triplet-triplet annihilation nir-upconversion luminescence of fluorescein

机译:分子振动辅助三重态-三重态an灭荧光素的nir上转换发光

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摘要

Here we report the near-infrared-upconversion (NIR-UC) luminescence of the organic dye fluorescein, without the need of metal-based NIR-UC materials or the use of high-energy and high-cost two-photon absorption excitation (TPA) systems. Fluorescein upconverts NIR light (lambda = 920 nm) to visible light (lambda = 545 nm) in aqueous solutions, with a pH-dependent light-intensity, by using a low-energy and low-cost nanosecond pulsed laser. The NIR-UC of fluorescein is explained with a triplet-triplet annihilation (TTA) mechanism, assisted by molecular vibrations. This work opens the door for deep-penetration bioimaging and photodynamic therapy, as well for NIR-excited TTA, photocatalysis and photovoltaics, by using solely high quantum yield organic molecules.
机译:在这里,我们报告了有机染料荧光素的近红外上转换(NIR-UC)发光,不需要金属基NIR-UC材料或使用高能量和高成本的两光子吸收激发(TPA) )系统。荧光素通过使用低能量和低成本的纳秒脉冲激光,将pH依赖的光强度将水溶液中的NIR光(λ= 920 nm)上转换为可见光(λ= 545 nm)。荧光素的NIR-UC通过三重态-三重态an灭(TTA)机制进行了解释,并借助分子振动进行了解释。仅使用高量子产率的有机分子,这项工作为深穿透生物成像和光动力疗法以及近红外激发的TTA,光催化和光伏技术打开了大门。

著录项

  • 来源
    《Optical Materials》 |2019年第10期|109286.1-109286.5|共5页
  • 作者单位

    Indian Sch Mines Dhanbad Dept Appl Phys Opt Mat & Bio Imaging Res Lab Indian Inst Technol Dhanbad 826004 Jharkhand India|Univ Porto Ctr Invest Quim CIQ UP Fac Ciencias Rua Campo Alegre S-N P-4169007 Porto Portugal;

    Univ Porto Ctr Invest Quim CIQ UP Fac Ciencias Rua Campo Alegre S-N P-4169007 Porto Portugal|Univ Porto Dept Geosci Environm & Terr Planning GreenUPorto LACOMEPHI Fac Sci R Campo Alegre 697 P-4169007 Porto Portugal;

    Indian Sch Mines Dhanbad Dept Appl Phys Opt Mat & Bio Imaging Res Lab Indian Inst Technol Dhanbad 826004 Jharkhand India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Upconversion; Organic dye; Fluorescein; Triplet-triplet annihilation (TTA) etc;

    机译:上转换;有机染料;荧光素;三重态-三重态an灭(TTA)等;

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