Photoluminescence properties of Eu2+-activated thiogallate phosphors

Abstract

This work analyzes the crystal structural properties and photoluminescence properties of six Eu²⁺-activated thiogallates: CaGa₂S₄:Eu²⁺, SrGa₂S₄:Eu²⁺, EuGa₂S₄, BaGa₂S₄:Eu²⁺, Sr₂Ga₂S₅:Eu²⁺, and Eu₂Ga₂S₅. Photoluminescence parameters such as the absorption energy (E_abs), emission energy (E_em), zero-phonon line energy (E₀), Stokes shift (ΔS), and red shift (D) are discussed. This work is the first report on the photoluminescence parameters of these six Eu²⁺-activated thiogallates and therefore provides important information about these materials.