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Related Concept Videos

Photoluminescence: Applications01:14

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
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Rigid Graphene Nanoribbons Enable Efficient Near-Infrared Room-Temperature Phosphorescence Emission.

Yongfeng Zhang1, Kangyao Chen2, Wei Jiang3

  • 1Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.

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Summary

Researchers developed novel graphene nanoribbon materials for near-infrared (NIR) room-temperature phosphorescence (RTP). These materials offer efficient NIR emission and persistent afterglow, showing promise for advanced biophotonic applications.

Keywords:
bioimagingextended conjugationnear-infrared phosphorescence emissionorganic room temperature phosphorescencepolymer matrix rigidificationrigid graphene nanoribbons

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Area of Science:

  • Materials Science
  • Photophysics
  • Nanotechnology

Background:

  • Triggering near-infrared (NIR) room-temperature phosphorescence (RTP) is challenging due to nonradiative decay facilitated by thermal vibrations.
  • Developing efficient NIR RTP materials is crucial for advanced biophotonic applications, including bioimaging and sensing.

Purpose of the Study:

  • To design and synthesize high-performance NIR RTP materials based on graphene nanoribbons.
  • To investigate the relationship between molecular conjugation and NIR phosphorescence emission.
  • To evaluate the potential of these materials for in vivo applications.

Main Methods:

  • Synthesis of a series of graphene nanoribbons (nHBT, n = 1-4).
  • Doping nHBT in polyvinylpyrrolidone (PVP) to achieve NIR RTP.
  • Characterization of photophysical properties, including emission wavelength, quantum yield, and lifetime.
  • Preparation of NIR RTP nanoparticles using polystyrene-b-poly(ethylene glycol) (PS-PEG).
  • In vivo evaluation of signal-to-background ratio.

Main Results:

  • Enhanced molecular conjugation in graphene nanoribbons led to red-shifted phosphorescence and NIR emission.
  • NIR RTP with a maximum emission wavelength of 898 nm, quantum yield of 2.9%, and lifetime of 1.9 ms was achieved.
  • The rigid framework enabled persistent afterglow even at elevated temperatures (377 K).
  • Well-dispersed NIR RTP nanoparticles were successfully prepared.
  • In vivo studies showed a high signal-to-background ratio of 47.3 ± 4.2, effectively suppressing background fluorescence.

Conclusions:

  • Rigid graphene nanoribbons serve as a versatile platform for developing high-performance NIR RTP materials.
  • These materials exhibit excellent photophysical properties and stability for biophotonic applications.
  • The developed NIR RTP nanoparticles show significant potential for in vivo imaging with reduced background interference.