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Bi3+-Related Multimode Emission in Garnet: A First-Principles Study.

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  • 1College of Electronic and Information Engineering, West Anhui University, Lu'an 237012, China.

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Summary
This summary is machine-generated.

This study investigates multiband emissions in bismuth-doped Y3Ga(Al)5O12 phosphors. Calculations reveal violet emission from Bi3+ at Y sites, while visible emissions originate from Bi3+ dimers, not charge transfer at Ga/Al sites.

Keywords:
Bi3+ and Bi3+ dimerfirst-principlesmultiband emissiontransition process

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Luminescence

Background:

  • Bismuth-doped garnets are promising phosphors.
  • Understanding emission mechanisms is crucial for material optimization.

Purpose of the Study:

  • Investigate multiband emissions in Bi-doped Y3Ga(Al)5O12.
  • Clarify the origins of violet and visible emissions.
  • Analyze the relationship between coordination environment and luminescence.

Main Methods:

  • Systematic first-principles calculations.
  • Formation energy calculations.
  • Vacuum-referred binding energy (VRBE) model.

Main Results:

  • Violet emission attributed to 3P1-1S0 transition of Bi3+ at Y sites.
  • Visible emissions linked to Bi3+ dimers, not MMCT at Ga/Al sites.
  • VRBE model used to determine Bi3+ energy levels.

Conclusions:

  • Bismuth-doped garnet luminescence is site-dependent.
  • Coordination environment significantly impacts emission properties.
  • Findings aid in optimizing luminescent materials.