4.6 Article

Optical Haze Nanopaper Enhanced Ultraviolet Harvesting for Direct Soft-Fluorescent Emission Based on Lanthanide Complex Assembly and Oxidized Cellulose Nanofibrils

Journal

ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 11, Pages 9966-9975

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b00970

Keywords

Oxidized cellulose nanofibrils; Lanthanide complexes; Optical haze with light diffusion; Ultraviolet harvesting; Soft-fluorescent LED

Funding

  1. Key scientific research plan (Key Laboratory) of Shaanxi Provincial Education Department [17JS016]
  2. National Natural Science Foundation of China [21703131]
  3. Doctoral Scientific Research Foundation of Shaanxi University of Science Technology [2016BJ-40]
  4. State Key Laboratory of Pulp and Paper Engineering [201821]
  5. Shaanxi Provincial Department of Education [18JK0122]
  6. Chinese Postdoctoral Science Foundation [2018M643707]

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Optical haze nanopapers were fabricated based on a self-assembly process of lanthanide complexes with tris(2-benzimidazolylmethyl) amine (NTB) [(Tb(NTB)Cl-3 and/or Eu(NTB)Cl-3] and TEMPO-oxidized cellulose nanofibrils (tCNFs), using a subsequent simple blending-vacuum filtration method. These optical haze nanopapers were characterized in terms of visible light transmittance, efficiency of ultraviolet (UV) light harvesting, and soft-fluorescence emission. The lanthanide complexes acted as a light-scattering source to enhance optical haze (similar to 100%) and a light emitter to emit soft-fluorescence under a UV light-emitting diode (UV-LED, lambda(ex), 365 nm). Due to excellent light-scattering behavior induced by the optical haze nanopaper, UV harvesting efficiency was increased from 53% to 98%, and the absolute quantum efficiency was enhanced from 21% to 25%. The optical haze nanopaper with high efficiency UV harvesting and soft-fluorescent emission presented potential applications in solar cells, lampshades, light diffusers, UV-blocking devices, anticounterfeiting devices, and organic light-emitting diodes.

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