Luminescent properties of a novel reddish-orange phosphor Eu-activated KLaSiO₄

A novel reddish-orange emitting phosphor Eu-activated KLaSiO₄ was synthesized by the conventional solid-state reaction at 1200 °C. The luminescence properties of KLaSiO₄:Eu phosphor were investigated, and the critical concentration of the activator ion (Eu³⁺) was established as 0.02 mol per formula unit. Chromaticity coordinates of a typical KLa_0.98SiO₄:0.02Eu phosphor were x = 0.614 and y = 0.385. The phosphor exhibited reddish-orange luminescence with dominating emission at 612 nm, corresponding to ⁵D₀ → ⁷F₂ of Eu³⁺. Furthermore, the phosphor was characterized by excellent thermal stability, implying its potential use in white light emitting diodes.