Designing New Oxyfluoride Phosphor Materials with Anti-Perovskite Structures

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Eirin Sullivan

Mentor Department



The oxyfluoride family of materials Sr3-xAxMO4F (A = Ca, Sr, Ba; M = Al, Ga) crystallize in anti-perovskite related structures. These phases are promising host lattices for new phosphors and have three crystallographically distinct sites available for incorporation of activator cations: 10-coordinate A(1), 8 co-ordinate A(2), and tetrahedrally-coordinated M. Non rare-earth activators such as In3+, P5+, and Bi3+ have been substituted on the M and A(1) sites respectively to form the photoluminescent materials Sr3-xBaxAl1-cIncO4-αF1-δ (0 ≤ x ≤ 0.6; 0 ≤ c ≤ 0.2; 0 ≤ α ≤ 0.05; ; 0 ≤ δ ≤ 0.05) [1], Sr2.5-xBa0.5Al1-xPxO4F (0 ≤ x ≤ 0.15) [2] and Sr3-xBi2x/3MO4F (0 ≤ x ≤ 0.048; M = Al, Ga) [3]. All these materials absorb in the UV region of the electromagnetic spectrum and have broad emissions of visible light, with the In3+-doped materials emitting in the yellow-orange region and the P5+ and Bi3+-doped materials emitting in the blue region. This research explores the synthesis of the Ga-analog Sr2.5-xBa0.5Ga1-xPxO4F (0 ≤ x ≤ 0.15) and examines the feasibility of whether the Sr3-xAxMO4F structure is amenable to co-doping of In3+ on the M site and Bi3+ on the A(1) site to form phases of the composition Sr2.976Bi0.16M1-xInxO4F (0 ≤ x ≤ 0.25; M = Al, Ga). This synthetic approach aims to combine the yellow emission of In3+ on the M site and the blue emission of Bi3+ on the A(1) site to produce a rare earth-free phosphor which yields an overall white light emission. 1. S. Park and T. Vogt, J. Phys. Chem. C., (2010), 114, 26, 11576-11583. 2. S. T. Keil, J. Chhoeun, M. Avdeev and E. Sullivan (2018) in preparation 3. C. D. Quilty, M. Avdeev, J. D. Driskell and E. Sullivan, Dalton Trans., (2017), 46, 4055-4065.



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