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Photoluminescence: Applications01:14

Photoluminescence: Applications

386
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...
386

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Micro-Inclusion Engineering via Sc Incompatibility for Luminescence and Photoconversion Control in Ce3+-Doped

Karol Bartosiewicz1, Robert Tomala2, Damian Szymański2

  • 1Faculty of Physics, Kazimierz Wielki University, Powstańców Wielkopolskich Street 2, 85-090 Bydgoszcz, Poland.

Materials (Basel, Switzerland)
|June 19, 2024
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Summary

This study engineered novel aluminum garnet crystals by substituting scandium (Sc) to control luminescence. The optimized crystal (x=2.0) achieved high luminous efficacy and daylight-like color temperature for advanced lighting applications.

Keywords:
Ce3+ luminescenceRaman spectroscopyTb3+ luminescenceenergy transfergarnetperovskitephotoconversionsingle crystalthermoluminescencewhite LED

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Luminescence

Background:

  • Aluminum garnets offer versatile platforms for synthesizing new materials.
  • Controlling material properties through atomic substitution is crucial for advanced applications.

Purpose of the Study:

  • To explore Ce3+-doped Tb3Al5-xScxO12 crystals and control luminescence via atomic size mismatch engineering.
  • To investigate the impact of scandium (Sc) substitution on crystal structure, phase formation, and optical properties.

Main Methods:

  • Synthesis of Ce3+-doped Tb3Al5-xScxO12 crystals with varying Sc concentrations (x = 0.5 to 3.0).
  • Characterization using Raman spectroscopy to analyze crystal phases and lattice dynamics.
  • Evaluation of luminescence properties, including luminous efficacy (LE), color rendering index (CRI), and correlated color temperature (CCT).

Main Results:

  • Raman spectroscopy confirmed coexistence of garnet and perovskite phases, with Sc substitution softening the A1g mode up to x = 2.0.
  • Sc substitution controlled inclusion formation and influenced energy transfer dynamics between Ce3+ and Tb3+ ions.
  • Optimized Sc concentration (x = 2.0) yielded the highest LE (114.6 lm/W) and a CCT of 4942 K, approximating daylight.

Conclusions:

  • Atomic size mismatch engineering using Sc substitution effectively tunes luminescence and photoconversion properties in aluminum garnets.
  • The developed Ce3+-doped Tb3Al5-xScxO12 crystals show promise for lighting technology, persistent phosphors, scintillators, and storage phosphors.