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Artificial Light-Harvesting System with Three-Step Cascade Energy Transfer Process for Full-Color Luminescence

Hui-Cong Ge1, Shengsheng Yu1,2, Jian Zhu2

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ACS Applied Materials & Interfaces
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Researchers developed a novel artificial light-harvesting system (LHS) using cascade energy transfer. This system achieves full-visible spectrum multicolor and white light emission, advancing luminescent material applications.

Keywords:
fluorescence resonance energy transferlight-emitting deviceslight-harvesting systemmulticolor fluorescencesupramolecular complex

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Area of Science:

  • Materials Science
  • Photochemistry
  • Supramolecular Chemistry

Background:

  • Artificial light-harvesting systems (LHS) are crucial for tunable luminescence but achieving full-color regulation in a single system remains challenging.
  • Cascade fluorescence resonance energy transfer (FRET) offers a mechanism for regulating luminescent performance.
  • Existing LHS often struggle with comprehensive spectral coverage.

Purpose of the Study:

  • To design and construct a single artificial light-harvesting system (LHS) capable of full-color luminescent regulation.
  • To achieve effective white light and multicolor fluorescence emission within the visible spectrum.
  • To explore the potential of supramolecular complexes in advanced FRET-based systems.

Main Methods:

  • Preparation of a cationic 6-bromobenzo[de]isochromene-1,3-dione derivative (BNI).
  • Formation of a supramolecular complex between BNI and sulfobutylether-β-cyclodextrin (SBE-β-CD) via electrostatic interactions.
  • Construction of a three-step cascade energy transfer pathway using the BNI-SBE-β-CD complex as the energy donor and commercial dyes (Fluorescein, Rhodamine B, Sulforhodamine 101) as acceptors.

Main Results:

  • The BNI-SBE-β-CD supramolecular complex exhibited strong dark blue fluorescence.
  • A three-step sequential FRET process was successfully established, enabling energy transfer from blue to green, orange, and red wavelengths.
  • Precise control over acceptor ratios allowed for tunable multicolor fluorescence and white light emission across the visible spectrum.
  • The system demonstrated effective utilization in multicolor fluorescent light-emitting devices.

Conclusions:

  • A novel supramolecular artificial light-harvesting system was successfully designed and constructed.
  • The developed LHS achieves efficient multicolor and white light emission through a three-step cascade FRET mechanism.
  • This system shows significant potential for applications in advanced optoelectronic devices and information storage.