Thermal & Humidity Stability of Mn4+ Doped Complex Fluoride Phosphors

Mn⁴⁺ doped complex fluoride based red phosphors have the potential to improve efficiency and color quality (CRI & R9) in LED lighting systems and enhance color gamut for LED displays. Owing to low absorption of Mn⁴⁺, high Mn⁴⁺ doping concentration is necessary to enable low CCT applications. One of the issues with Mn⁴⁺ doped phosphors is their high temperature and high humidity (HTHH) stability which is even more important for high Mn⁴⁺ doping. Here we will discuss the various post synthesis treatment techniques that help improve HTHH stability of Mn⁴⁺  doped fluoride phosphors.