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ABSTRACT Fluorapatite Ca9La(PO4)5(SiO4)F2: Eu with variable molar concentrations of Eu3+ (0.05–1.0 mol%) were synthesised by the solid-state reaction method and their photoluminescence (PL), thermoluminescence (TL) characteristics were studied after irradiating the… Click to show full abstract
ABSTRACT Fluorapatite Ca9La(PO4)5(SiO4)F2: Eu with variable molar concentrations of Eu3+ (0.05–1.0 mol%) were synthesised by the solid-state reaction method and their photoluminescence (PL), thermoluminescence (TL) characteristics were studied after irradiating the samples with γ-rays and 75 MeV O6+ ion beam. The formation of the material was confirmed using X-ray diffraction pattern followed by Scanning electron microscopy and Fourier transform infra-red (FTIR) spectrum. The morphology of the synthesised powder was observed to be polycrystalline constituted by microcrystalline particles. FTIR spectrum shows characteristic bands, 563 cm−1 for bending vibration υ4 and 1035 cm−1 for stretching vibration υ3. PL spectra show absorption bands at 395 and 466 nm corresponding to 7F0→5L6 and 7F0→5D2 transitions and the emission band was seen at around 595 and 616 nm describing 5D0→7Fj transitions (j = 1,2). Furthermore, TL glow curves of both γ-rays and 75 MeV O6+ ion beam irradiated samples show a prominent peak at around 145°C with a small hump at around 245°C. The concentration 0.2 and 1 mol% was found to be the best concentration for studying TL properties of Ca9La(PO4)5(SiO4)F2: Eu irradiated with γ-rays and 75 MeV O6+ ion-beam respectively.