Synthesis and luminescence properties of a Cyan‐blue thiosilicate‐based Phosphor SrSi ₂ S ₅ :Eu ²⁺

Abstract A series of Sr‐Si‐S compounds was synthesized using an advanced chemical method in which the use of one solution‐based process uniformly dispersed the Eu2+ activators in the host crystals, to find new compositions that would suit phosphor applications. Particular focus was given to the Si‐rich region. This led to the synthesis of a single‐phase compound that showed an unknown X‐ray diffraction pattern. This compound had a composition close to that of SrSi2S5. When this compound is activated with Eu2+ (SrSi2S5:Eu2+), it shows a cyan‐blue emission with a main luminescence peak at 495 nm. This emission is excited by wavelengths of 250–440 nm and has a maximum excitation at 350 nm.