Synthesis and luminescence properties of RE3+ (re = eu3+, Dy3+) activated CaSr2(PO4)2 phosphors for lighting and dosimetric applications. (November 2020)

• Record Type: Journal Article
• Authors: Parauha, Yatish R.; Chopra, Vibha; Dhoble, S.J.
• Is Part Of: Materials research bulletin. Volume 131(2020)
• Publication Date: 2020-11
• Subjects: Solid state diffusion method -- XRD pattern -- Photoluminescence -- Phosphor -- Thermoluminescence; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2020.110971
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: Synthesis of RE 3+ (RE = Eu 3+, Dy 3+ ) activated CaSr2 (PO4 )2 phosphors using solid state reaction method Study of Luminescence properties of CaSr2 (PO4 )2 material irradiated with γ-ray & 75 MeV O 6+ beam Explanation of luminescence properties using PL, FTIR, TL studies Abstract: A series of RE 3+ (RE = Eu 3+, Dy 3+ ) activated CaSr2 (PO4 )2 phosphors were successfully synthesized by the Solid-State Diffusion method at high temperature. X-ray diffraction (XRD) pattern and Fourier transform infrared (FT-IR) spectra explained the structural properties and crystalline nature of the prepared sample. The Scanning Electron Microscopy (SEM) study represents particle size and morphological behavior of the prepared sample. The luminescence properties of the prepared phosphor were investigated by Photoluminescence (PL) and Thermoluminescence (TL) techniques. The PL properties of Eu 3+ activated CaSr2 (PO4 )2 phosphors monitored under near-ultraviolet excitation at 395 nm, exhibited two strong, orange and red emission peaks at 593 nm and 615 nm respectively corresponding to the characteristic 5 D0 → 7 F1 and 5 D0 → 7 F2 transitions of Eu 3+ ions. Further, Dy 3+ activated CaSr2 (PO4 )2 phosphors monitored under 350 nm excitation wavelength, exhibited two strong, blue, and yellow emission peaks at 481 nm and 572 nm respectively, corresponding to the characteristic 4 F9/2 → 6 H15/2 and 4 F9/2 → 6 H13/2 transitions of Dy 3+ ion. The CIE chromaticity diagram shows high color purity and excellent chromaticity coordinates and it also shows the presence of emission bands in the visible spectrum. The TL properties of (RE = Eu 3+, Dy 3+ ) activated CaSr2 (PO4 )2 phosphors were investigated after irradiating the samples with 75 MeV Oxygen ion beam and Gamma rays. CaSr2 (PO4 )2 :Eu samples show TL response linearity in the fluence range 5 × 10 10 ions/cm 2 to 1 × 10 11 ions/cm 2 whereas CaSr2 (PO4 )2 :Dy samples show linearity in the range 5 × 10 10 ions/cm 2 to 5 × 10 11 ions/cm 2 when irradiated with 75 MeV O 6+ ion beam. Further γ-ray irradiated CaSr2 (PO4 )2 samples show TL response linearity for dose range 1.75 kGy to 21.06 kGy when activated by Eu and 0.116 kGy to 2.32 kGy when activated by Dy. So, CaSr2 (PO4 )2 activated by RE 3+ (RE = Eu 3+, Dy 3+ ) phosphor is a promising candidate for lighting and dosimetric applications.