Luminescence analysis of SrGa₂ Si₂ O₈ : RE³⁺ (RE = Dy, Tm) phosphors

This article reports on the luminescence properties of rare earth (Dy³⁺ and Tm³⁺ )ions doped SrGa₂ Si₂ O₈ phosphor were studied. SrGa₂ Si₂ O₈ phosphors weresynthesizedby employing solid state reaction method.From the measured X-ray diffraction (XRD) pattern of the samplemonoclinic phase structure has been observed. Thermoluminescenceand Mechanoluminescence properties of the γ-ray irradiated samples have been studied. Photoluminescence spectra of Dy³⁺ activated SrGa₂ Si₂ O₈ phosphor has been measured with an excitation wavelength at 348 nm,and it shows two emission bands at 483 and 574 nm due to ⁴ F_9/2  → ⁶ H_15/2 and ⁴ F_9/2  → ⁶ H_13/2 transitions respectively. Whereas the photoluminescence spectra of Tm³⁺ activated SrGa₂ Si₂ O₈ phosphor has been measured with an excitation wavelength at 359 nm and it exhibits two emission bands at 454 and 472 nm due to ¹ D₂  → ³ F₄ and¹ G₄  → ³ H₆ transitions respectively. In thermoluminescence study, γ-irradiatedthermoluminescence glow curve of SrGa₂ Si₂ O₈ :Dy³⁺ phosphor shows two well defined peaks at 293 °C (peak1)and 170 °C (peak2) whereas thermoluminescence glow curve of SrGa₂ Si₂ O₈ :Tm³⁺ phosphor shows peaks at 292 °C (peak1) and 184 °C (peak2) indicating that two sets of traps are being activated within the particular temperature range and the trapping parameters associated with the prominent glow peaks of SrGa₂ Si₂ O₈ :Dy³⁺ and SrGa₂ Si₂ O₈ :Tm³⁺ are calculated using Chen's peak shape and initial rise method.From the Mechanoluminescence study, only one glow peak has been observed. Copyright © 2016 John Wiley & Sons, Ltd.