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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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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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Photoluminescence: Fluorescence and Phosphorescence01:23

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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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Mixed-Layered Lead Halide Frameworks with High Stability and Efficient Room-Temperature Phosphorescence.

Chen Sun1, Dongyang Li1, Wenyan Dan1

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|August 9, 2024
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New lead halide frameworks offer stable, long-lasting room-temperature phosphorescence for advanced optical anticounterfeiting. These materials exhibit robust structure and efficient green afterglow, enhancing information security applications.

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Area of Science:

  • Materials Science
  • Photophysics
  • Chemical Engineering

Background:

  • Room-temperature phosphorescent (RTP) materials are vital for optical anticounterfeiting and information security.
  • Organic metal halides show promise for RTP but suffer from instability, limiting practical use.

Purpose of the Study:

  • To develop stable and efficient RTP materials for anticounterfeiting applications.
  • To synthesize novel layered lead halide frameworks with enhanced photophysical properties and structural integrity.

Main Methods:

  • Coordination-driven synthesis using organocarboxylates to create isostructural layered lead halide frameworks.
  • Characterization of the frameworks' mixed-layered topology and photophysical properties, including afterglow lifetime and photoluminescence quantum yield (PLQY).
  • Assessment of structural robustness under ambient conditions and stability in various aqueous environments (boiling water, acidic, basic).

Main Results:

  • Two isostructural layered lead halide frameworks with a novel mixed-layered topology were synthesized.
  • The frameworks exhibit long-lived green afterglow (up to 45.89 ms) and high PLQY (up to 43.13%).
  • The materials demonstrated excellent structural robustness (over 12 months) and stability in diverse chemical environments.

Conclusions:

  • The synthesized lead halide frameworks offer a promising solution for stable and efficient room-temperature phosphorescence.
  • The coordination strategy enhances light-harvesting, charge transfer, and spin-orbit coupling, leading to superior phosphorescent properties.
  • The materials' stability and efficient afterglow enable versatile anticounterfeiting applications across various conditions.