Abstract:

A series of Eu²⁺ single doped and Tm³⁺ co-doped CaAlSiN₃ phosphors were synthesized by high temperature solid-reaction method. Photoluminescence, afterglow emission and thermoluminescence glow curve investigations indicate that CaAlSiN₃:0.1%Eu²⁺ sample possesses excellent photoluminescence properties with broad emission band located at about 630 nm. The introduction of Tm³⁺ codopant creates new emission bands located 654 nm and 800 nm, respectively, which are originated from Tm³⁺ in CaAlSiN₃ matrix. However, the Tm³⁺ codopant causes the disappearance of 89.0 ℃ thermoluminescence glow peak, which indicates that the introduction of Tm³⁺ has changed the defect distribution and their concentrations, thus deceasing the visible 630 nm red light afterglow of CaAlSiN₃:Eu²⁺.

Key words: CaAlSiN3: Eu²⁺, rare earth co-doped, persistent luminescence, traps