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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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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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Intense Hydrochromic Photon Upconversion from Lead-Free 0D Metal Halides For Water Detection and Information

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New cesium gadolinium chloride metal halides show tunable hydrochromic upconversion luminescence. These materials enable sensitive water detection and advanced information encryption applications.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Nanotechnology

Background:

  • Hydrochromic materials change luminescence color with moisture, useful for sensing and encryption.
  • Existing materials often lack sufficient hydrochromic response and color tunability.

Purpose of the Study:

  • Develop novel hydrochromic materials with enhanced photon upconversion properties.
  • Investigate cesium gadolinium chloride (Cs3GdCl6) as a host for hydrochromic upconversion luminescence (UCL).

Main Methods:

  • Synthesized 0D Cs3GdCl6 metal halide in polycrystal (PC) and nanocrystal forms.
  • Co-doped the host material with lanthanides, specifically Yb3+ and Er3+.
  • Utilized 980 nm laser excitation to observe upconversion luminescence (UCL).

Main Results:

  • Co-doped Cs3GdCl6 PCs exhibited hydrochromic UCL, shifting from green to red upon moisture exposure.
  • Demonstrated sensitive water detection in tetrahydrofuran using UCL color changes.
  • Exploited hydrochromic UCL for stimuli-responsive information encryption.

Conclusions:

  • Developed a new class of bright, hydrochromic upconverting materials based on Cs3GdCl6.
  • The material shows potential for real-time, long-term water monitoring and anti-counterfeiting applications.
  • Findings advance the development of advanced hydrochromic upconverting materials for sensing and encryption.