Discovery of narrow-band emitting phosphor Na5Al3F14:Eu2+ using local structure similarity

Abstract

Narrow-band emitting phosphors are utilized to improve the color purity and expand the color gamut of display. Data-driven approach is an effective technique to search the host material of the narrow-band emitting phosphors. Herein, we discover a new narrow-band emitting phosphor Na₅Al₃F₁₄:Eu²⁺ by a local structure similarity. 2D scatter plot of the structural similarity revealed that the local structure of Na1-site of the Na₅Al₃F₁₄ located to near the Sr-sites of the narrow-band emitting phosphor SrLiAl₃N₄:Eu²⁺. A powder of the narrow-band emitting phosphor Na₅Al₃F₁₄:Eu²⁺ was successfully synthesized by a solid-state reaction method. The Na₅Al₃F₁₄:Eu²⁺ phosphor exhibited a narrow-band emission at 393 nm with a full width at half-maximum of 30 nm (1549 cm^-1). The internal and external quantum efficiency was 56.0% and 45.0%, respectively. The photoluminescence intensity at 200°C was maintained at 63.0% of room temperature. This approach accelerates the discovery of new phosphors with specific luminescence properties.