Integrated Surface Modification to Enhance the Luminescence Properties of K₂TiF₆:Mn⁴⁺ Phosphor and Its Application in White-Light-Emitting Diodes

Abstract

Narrow-band Mn⁴⁺-doped fluoride phosphors have become a research hotspot worldwide. In this study, we propose integrated surface modification processes to enhance the performance and stability of the luminescence properties of K₂TiF₆:Mn⁴⁺ (KTF) phosphor. These integrated process are applied in the initial synthesis step, coating of the as-synthesized powder post-treatment process, and during the application of the phosphor in the white-light-emitting diode (WLED) device. Surface etching is conducted to remove impurities and small particles in KTF. Double-shell coating forms a stable protective layer outside the KTF. Atomic layer deposition is employed for the surface of the WLED device.