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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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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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Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
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Stable, Full-Color, Long-Lasting Aqueous Room-Temperature Phosphorescent Materials.

Zhaorun Tang1,2, Jianwen Zeng1,2, Zhihao Guan1,2

  • 1Hubei Engineering Technology Research Center of Spectrum and Imaging Instrument, School of Electronic Information, Wuhan University, Wuhan, 430072, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|December 16, 2024
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Summary

Researchers developed new full-color aqueous ultralong room-temperature phosphorescent (URTP) materials using a rapid microwave method. These stable URTP materials show potential for anti-counterfeiting and advanced displays, even in water.

Keywords:
full‐color illuminated displaylong‐lasting aftergloworganic room‐temperature phosphorescentwater‐enhanced luminescence

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Area of Science:

  • Materials Science
  • Chemistry
  • Optics

Background:

  • Ultralong room-temperature phosphorescent (URTP) materials offer unique optical properties for applications like anti-counterfeiting and bio-imaging.
  • Challenges include weak emission and quenching in aqueous solutions for many existing URTP materials.

Purpose of the Study:

  • To develop a simple and effective method for creating full-color URTP materials that are stable and functional in aqueous environments.
  • To investigate the phosphorescent properties and potential applications of these novel materials.

Main Methods:

  • A one-step microwave-assisted synthesis was employed to embed guest molecules within a rigid cyanuric acid (CA) matrix derived from urea.
  • The conjugation of guest molecules was enhanced to achieve a full-color emission spectrum.

Main Results:

  • A series of full-color aqueous URTP materials with excellent phosphorescent properties, including a maximum phosphorescent lifetime of 7.96 s, were successfully synthesized.
  • The CA matrix protected the phosphorescence in water, with visible afterglow exceeding 30 s.
  • Exceptional water-enhanced properties were observed, reaching a phosphorescence quantum yield (PhQY) of 40.4% under low water content.

Conclusions:

  • The developed one-step microwave method provides a rapid (5 min) and efficient route to produce stable, full-color aqueous URTP materials.
  • These materials demonstrate significant potential for applications in information encryption and advanced afterglow display technologies.