Luminescence Properties of Nano-Sized Sr₂MgSiO₅:Eu²⁺, Mn²⁺ Phosphors Prepared by the Sol–Gel Method

Nano-sized Sr₂MgSiO₅:Eu²⁺, Mn²⁺ phosphor was synthesized by the sol–gel method. The preparation conditions of the precursor were determined. The effect of Eu²⁺ and Mn²⁺ content on the luminescence intensity was studied. X-ray diffraction (XRD), photoluminescence spectra (PL), and photoluminescence excitation spectra (PLE) were used to characterize the samples. The results showed that the excitation bands ranged from 250 to 450 nm, and their peaks positioned around 365 nm. The emission spectrum consists of three bands: blue, green, and red, respectively. The blue and green emission bands originate from the center of the Eu²⁺, while the red emission band is attributed to the energy transfer from Eu²⁺ to Mn²⁺. White light can be obtained by mixing the three emission colors. The experiment results show that the Sr₂MgSiO₅:Eu²⁺, Mn²⁺ is a single host phosphor with superior properties for use in white light emitting diodes (white LED).