Influence of co-doping of divalent ions on the photoluminescence intensity of Mn4+ doped CaAl12O19

Umar Zafari, Musashi Sagayama, Mekhrdod Subhoni, Alok M. Srivastava, William W. Beers, William E. Cohen, Chong Geng Ma, Michal Piasecki, Mikhail G. Brik, Tomoyuki Yamamoto*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Influence of co-dopings of divalent ions such as Mg2+, Zn2+, Cd2+ and Sr2+ ions in Mn4+-doped CaAl12O19 red phosphor on its photoluminescence characteristics has been investigated. Samples of Mn4+-doped CaAl12O19 and co-doped with Mg2+, Zn2+, Cd2+ and Sr2+ ions were synthesized by a solid-state reaction method. Significant enhancement of photoluminescence intensity was observed, when Mg2+ and Zn2+ were co-doped in Mn4+-doped CaAl12O19, while only slight enhancement was seen with Cd2+ and Sr2+ co-dopings. To investigate these differences in photoluminescence enhancement, change in local environment of Mn4+ ions due to co-dopings of divalent ions was examined by electron spin resonance (ESR) measurements and first principles calculations within a density functional theory. From these experimental and theoretical analysis, it has been confirmed that the local environment of Mn4+ changes significantly with Mg2+ and Zn2+ co-dopings, while Cd2+ and Sr2+ alter minimally the local environment of Mn4+ due to different substitution site.

Original languageEnglish
Article number100197
JournalOptical Materials: X
Publication statusPublished - 2022 Oct


  • CaAlO
  • ESR
  • First principles calculation
  • Local environment
  • Mn
  • Red phosphor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering


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