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NASICON-type Na3.6Y1.8-xScx(PO4)3 solid solutions: structure and luminescence.

Nataliya Krutyak1, Damian Wlodarczyk2, Irina Kudryavtseva1

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This study investigates novel Na3.6Y1.8-xScx(PO4)3 phosphors, revealing a NASICON structure and intense UV emission from self-trapped excitons. Enhanced luminescence and thermal stability are linked to structural disorder in these new materials.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Luminescence

Background:

  • Phosphor materials are crucial for various optical applications.
  • Understanding structure-property relationships is key to developing advanced phosphors.
  • Scandium-substituted sodium yttrium phosphate phosphors (Na3.6Y1.8-xScx(PO4)3) are novel materials.

Purpose of the Study:

  • To synthesize and characterize single-phase Na3.6Y1.8-xScx(PO4)3 phosphors for the first time.
  • To investigate their structural, thermal, and luminescence properties.
  • To explore the impact of scandium substitution on phosphor performance.

Main Methods:

  • X-ray diffraction (XRD) for structural analysis.
  • Raman spectroscopy to study phase transitions across a temperature range (88–873 K).
  • VUV, synchrotron, and electron beam excitation to examine luminescence properties.

Main Results:

  • Formation of a homogeneous solid solution with a NASICON-type structure.
  • No phase transitions observed within the studied temperature range.
  • Intense UV emission attributed to 2pO-3dSc self-trapped excitons under VUV/synchrotron excitation.
  • Bandgap estimated at ~8 eV, independent of composition.
  • Enhanced luminescence intensity and thermal stability in solid solutions due to structural disorder.

Conclusions:

  • Na3.6Y1.8-xScx(PO4)3 phosphors exhibit promising luminescence properties.
  • Structural disorder plays a significant role in enhancing exciton emission and thermal stability.
  • These findings suggest potential applications in areas requiring efficient UV-emitting materials.