The Luminescence Properties and Thermal Stability of a Green-Blue Color Tunable Sr ₂ SiO ₄ :Tb ³⁺ , Ce ³⁺ Phosphor

Abstract: In this paper, green-blue emitting Sr ₂ SiO ₄ (SSO):0.03Tb ³⁺ , xCe ³⁺ (x = 0–0.005) materials were synthesized via a solid-state reaction method. The crystal structures, luminescence properties, decay time, and thermal stability were measured in this work. The as-prepared phosphors exhibit both an indigo emission of Ce ³⁺ and green emission of Tb ³⁺ with considerable intensity (λ _ex = 300 nm). Tb ³⁺ ion emission was intensified obviously with co-doping Ce ³⁺ . The luminescence spectra of Sr ₂ SiO ₄ (SSO):0.03Tb ³⁺ , Ce ³⁺ shows characteristic line of Tb ³⁺ ion transition ( ⁵ D ₄ → ⁷ F ₅ ). Tunable green-blue color can be obtained by the addition of Ce ³⁺ ions. An effective energy transfer process between Tb ³⁺ and Ce ³⁺ was supposed and confirmed from decay curves. In addition, the energy transfer mechanism from Ce ³⁺ to Tb ³⁺ ions in the Sr ₂ SiO ₄ (SSO) host is electric multipolar interaction. Sr ₂ SiO ₄ (SSO):Tb ³⁺ , Ce ³⁺ phosphor exhibits good thermal stability, the quantum yield was about 43.67%, indicating a potential candidate for solid-state lighting. Graphical Abstract: Sr2SiO4:Tb ³⁺ , Ce ³⁺ phosphor can obtain tunable green-blue emission based on the energy transfer between Ce ³⁺ and Tb ³⁺ ion. Almost 90% of the luminescence intensity of SSO:0.03Tb ³⁺ , 0.003Ce ³⁺ phosphor was retained after an increase in temperature to 200 °C.[Figure not available: see fulltext.].