The photoluminescence adjustment of red phosphors ANaWO2F4:Mn4+ (A = Li, Na, K) by suitable tolerance factor designing.

Mn⁴⁺-activated perovskite-structured ANaWO₂F₄ (A = Li, Na, K) red phosphors were successfully prepared by a facile co-precipitation method. By changing the A-site ions, the tolerance factor (t) of host material ANaWO₂F₄ became adjustable. Red emissions in LiNaWO₂F₄:Mn⁴⁺, Na₂WO₂F₄:Mn⁴⁺ and KNaWO₂F₄:Mn⁴⁺ were found to be gradually increased. The relationship between the structure and their photoluminescence properties was discussed. The results suggested that a t-dependent photoluminescence behavior may exist in perovskite-structured phosphors. As the tolerance factor increases, the emission intensity of ANaWO₂F₄ (A = Li, Na, K) red phosphors increases. This work also provides a reference for the exploration and optimization of Mn⁴⁺-activated perovskite-structured red phosphors. [ABSTRACT FROM AUTHOR]