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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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Achieving Persistent Luminescence Performance Based on the Cation-Tunable Trap Distribution.

Tao Wang1, Rui Li2, Mengya Zhang2

  • 1College of Science, China University of Petroleum (East China), Qingdao 266580, China.

Materials (Basel, Switzerland)
|December 23, 2022
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Summary
This summary is machine-generated.

Researchers enhanced deep-red persistent luminescence (PersL) materials by doping Li₂ZnGe₃O₈:Cr³⁺ with Si⁴⁺ and Al³⁺ ions. This significantly boosted PersL intensity and duration for advanced anti-counterfeiting and tracking applications.

Keywords:
persistent luminescencephosphortrap regulationtunneling channel

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Luminescence

Background:

  • Deep-red persistent luminescence (PersL) materials are crucial for applications like fluorescence labeling and tracking.
  • Key performance metrics for PersL materials include spectral range and emission duration.
  • Optimizing the host material's electronic structure is vital for enhancing PersL properties.

Purpose of the Study:

  • To improve the performance of deep-red PersL materials, specifically intensity and duration.
  • To explore the effect of cation doping on the Li₂ZnGe₃O₈:Cr³⁺ host material.
  • To demonstrate the potential of optimized PersL materials in anti-counterfeiting and tracking applications.

Main Methods:

  • Systematic doping of Li₂ZnGe₃O₈:Cr³⁺ with silicon (Si⁴⁺) and aluminum (Al³⁺) ions.
  • Characterization of the doped materials to evaluate their persistent luminescence properties.
  • Application testing for multi-level anti-counterfeiting and tracking functionalities.

Main Results:

  • Achieved a 4.8-fold increase in PersL radiation spectrum intensity.
  • Extended PersL duration to over 47 hours, more than doubling the previous duration.
  • Demonstrated successful application of the optimized materials in multi-level anti-counterfeiting and tracking systems.

Conclusions:

  • Optimizing the host material, Li₂ZnGe₃O₈:Cr³⁺, through cation doping is an effective strategy for enhancing deep-red PersL performance.
  • The enhanced PersL materials exhibit significant potential for advanced security and tracking technologies.
  • Modulating the electronic structure of the PersL host provides a novel pathway for developing high-performance materials.