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<p>K<sub>3</sub>(PO<sub>3</sub>)F<sub>2</sub>:Ce<sup>3</sup>⁺ and K<sub>3</sub>(PO<sub>3</sub>)F<sub>2</sub>:Ce<sup>3</sup>⁺,Mn<sup>2</sup>⁺ phosphors were successfully synthesized through a citrate-assisted sol–gel route followed by calcination at 700&#xa0;°C for 24&#xa0;h under a charcoal-assisted reducing atmosphere. Structural characterization using X-ray diffraction suggests the formation of a single-phase fluorophosphate host without detectable impurity phases, while FTIR analysis verified the presence of characteristic phosphate vibrational groups. Thermal studies performed using TG–DTG–DTA revealed excellent thermal stability of the synthesized phosphors with negligible weight loss at elevated temperatures. Photoluminescence investigations demonstrated that Ce<sup>3</sup>⁺ ions exhibit an intense blue emission centered at 423&#xa0;nm originating from the allowed 5d → 4f transition, whereas Mn<sup>2</sup>⁺ ions produce a broad green emission band around 540&#xa0;nm corresponding to the <sup>4</sup>&#xa0;T<sub>₁</sub>(<sup>4</sup>G) → <sup>6</sup>A<sub>1</sub>(<sup>6</sup>S) transition. In the co-doped phosphors, a progressive decrease in Ce<sup>3</sup>⁺ emission accompanied by a significant enhancement of Mn<sup>2</sup>⁺ emission was observed with increasing Mn<sup>2</sup>⁺ concentration, confirming efficient Ce<sup>3</sup>⁺ → Mn<sup>2</sup>⁺ energy transfer. The maximum energy transfer efficiency was found to be approximately 57% for the highest investigated Mn<sup>2</sup>⁺ concentration. The calculated CIE chromaticity coordinates revealed a systematic shift of the emission color from the blue region toward the green region, demonstrating effective color tunability under near-ultraviolet excitation. The combination of structural stability, efficient energy transfer, and controllable emission characteristics highlights the potential of K<sub>3</sub>(PO<sub>3</sub>)F<sub>2</sub>:Ce<sup>3</sup>⁺,Mn<sup>2</sup>⁺ phosphors for near-ultraviolet excited solid-state lighting and display applications.</p>

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Efficient Ce3+ → Mn2+ energy transfer and tunable blue-to-green emission in K3(PO3)F2 fluorophosphate phosphors for near-UV excited solid-state lighting

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • Sandip V. Shinde,
  • Prashant P. Jadhav,
  • Prashant N. Parale,
  • N. P. Tendolkar,
  • Meera R. Kale,
  • S. J. Dhoble

摘要

K3(PO3)F2:Ce3⁺ and K3(PO3)F2:Ce3⁺,Mn2⁺ phosphors were successfully synthesized through a citrate-assisted sol–gel route followed by calcination at 700 °C for 24 h under a charcoal-assisted reducing atmosphere. Structural characterization using X-ray diffraction suggests the formation of a single-phase fluorophosphate host without detectable impurity phases, while FTIR analysis verified the presence of characteristic phosphate vibrational groups. Thermal studies performed using TG–DTG–DTA revealed excellent thermal stability of the synthesized phosphors with negligible weight loss at elevated temperatures. Photoluminescence investigations demonstrated that Ce3⁺ ions exhibit an intense blue emission centered at 423 nm originating from the allowed 5d → 4f transition, whereas Mn2⁺ ions produce a broad green emission band around 540 nm corresponding to the 4 T₁(4G) → 6A1(6S) transition. In the co-doped phosphors, a progressive decrease in Ce3⁺ emission accompanied by a significant enhancement of Mn2⁺ emission was observed with increasing Mn2⁺ concentration, confirming efficient Ce3⁺ → Mn2⁺ energy transfer. The maximum energy transfer efficiency was found to be approximately 57% for the highest investigated Mn2⁺ concentration. The calculated CIE chromaticity coordinates revealed a systematic shift of the emission color from the blue region toward the green region, demonstrating effective color tunability under near-ultraviolet excitation. The combination of structural stability, efficient energy transfer, and controllable emission characteristics highlights the potential of K3(PO3)F2:Ce3⁺,Mn2⁺ phosphors for near-ultraviolet excited solid-state lighting and display applications.