novel red phosphor NaLa₄(SiO₄)₃F: Eu

A novel red phosphor NaLa₄(SiO₄)₃F: Eu³⁺ was synthesized by the conventional solid-state reaction at 950°C for the first time. The luminescence properties of NaLa₄(SiO₄)₃F: Eu³⁺ were investigated, and the critical concentration of the activator concentration (Eu³⁺) was found to be 0.1mol per formula unit. The phosphor presented red luminescence under the ultraviolet excitation of 254 or 395nm, attributed to the transitions from ⁵D₀ excited states to ⁷FJ ( J=0–4) ground states of Eu³⁺ ions. The results indicated that this newly-developed phosphor could find applications in tricolor fluorescent lamp, phosphor-liquid crystal displays and white lighting devices utilizing GaN-based excitation in the near UV.