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

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 % of room temperature. This approach accelerates the discovery of new phosphors with specific luminescence properties. [Display omitted] •Narrow-band emitting phosphor Na5Al3F14:Eu2+ was discovered by a local structure similarity and a data-driven approach.•Powder of the Na5Al3F14:Eu2+ was synthesized by a solid-state reaction method.•The Na5Al3F14:Eu2+ phosphor exhibited a narrow-band emission at 393 nm with a FWHM of 30 nm (1549 cm−1).•The internal and external quantum efficiency was 56.0 % and 45.0 %, respectively.