A novel red emitting NaBa12B7O21F4:xEu3+phosphor: Synthesis, structure and luminescence properties
NaBa 12 B 7 O 21 F 4 : x Eu 3+ phosphors, where 0 < x ≤ 0.16, were obtained through the high temperature solid phase reaction method. The phosphors showed significant red fluorescence emission resulting from the dominant 5 D 0 → 7 F 2 transitions. The optimum doping concentration of Eu 3+ ions in the NaBa 12 B 7 O 21 F 4 matrix were estimated to be 14 mol%. The phenomenon of concentration quenching was researched, and the concentration quenching of NaBa 12 B 7 O 21 F 4 : x Eu 3+ phosphors maybe caused by the exchanging interaction of Eu 3+ ions. Moreover, it was found that the optimal-component NaBa 12 B 7 O 21 F 4 :0.14Eu 3+ phosphor showed high absolute luminescence quantum efficiency and had a millisecond fluorescence lifetime.
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