Luminescence and Formation of Cubic and Hexagonal (K,Rb)₂SiF₆:Mn⁴.

ABSTRACT: The efficient red-emitting phosphor K₂SiF₆:Mn⁴⁺ (KSF) is widely used for low-power LED applications. The saturated red color and sharp line emission are ideal for application in backlight LEDs for displays. However, the long excited state lifetime lowers the external quantum yield (EQY) at high photon flux, limiting the application in (higher power density) lighting. Here, we report the synthesis of a new crystalline phase: hexagonal (K,Rb)SiF₆:Mn⁴⁺ (h-KRSF). Due to the lower local symmetry, the Mn⁴⁺ emission in this new host material shows a pronounced zero phonon line, which is different from Mn⁴⁺ in the cubic KSF. The lower symmetry reduces the excited state lifetime, and thus, the loss of EQY under high photon

SUBMITTER: van Bunningen AJ 

PROVIDER: S-EPMC10788833 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature