Luminescence study and dosimetry approach of Ce on an α‐Sr₂P₂O₇ phosphor synthesized by a high‐temperature combustion method

Abstract

We report synthesis of a cerium-activated strontium pyrophosphate (Sr2 P2 O7 ) phosphor using a high-temperature combustion method. Samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), photoluminescence (PL) and thermoluminescence (TL). The XRD pattern reveals that Sr2 P2 O7 has an α-phase with crystallization in the orthorhombic space group of Pnam. The IR spectrum of α-Sr2 P2 O7 displays characteristic bands at 746 and 1190 cm(-1) corresponding to the absorption of (P2 O7 )(-4) . PL emission spectra exhibit a broad emission band around 376 nm in the near-UV region due to the allowed 5d-4f transition of cerium and suggest its applications in a UV light-emitting diode (LED) source. PL also reveals that the emission originates from 5d-4f transition of Ce(3+) and intensity increases with doping concentration. TL measurements made after X-ray irradiation, manifest a single intense glow peak at around 192°C, which suggests that this is an outstanding candidate for dosimetry applications. The kinetic parameters, activation energy and frequency factor of the glow curve were calculated using different analysis methods.

Tunable Luminescence and Energy Transfer in Novel Blue-Green-Emitting BaGd2Si3O10:Ce3+,Tb3+ Phosphors for Near-UV-Based White LEDs

“…In sharp contrast, Ce 3+ ions show broad absorption in the near-UV wavelength range due to spin- and parity-allowed 4f → 5d transition. Furthermore, the emission of Ce 3+ ions due to 5d → 4f transition can vary from long-wavelength UV to red depending on the factors like the crystal structure, lattice symmetry, and nature of the host composition. , To intensify the Tb 3+ absorption in the near-UV region, Ce 3+ ions can be introduced as sensitizers for Tb 3+ activators, which thus can enhance the emission intensity of Tb 3+ ions through Ce 3+ → Tb 3+ energy transfer mechanism. This could be favorable for improving the luminescence efficiency of phosphors used in LED applications. , …”

Origin of Blue-Green Emission in α-Zn2P2O7 and Local Structure of Ln3+ Ion in α-Zn2P2O7:Ln3+ (Ln = Sm, Eu): Time-Resolved Photoluminescence, EXAFS, and DFT Measurements

“…These materials need to have a sufficiently wide band gap, low phonon frequency, high thermochemical stability, easy availability, ease of synthesis, environmental benignness, etc. In fact, recently we have realized the potential of oxide-based hosts not only for lanthanide-doped luminescence but also as strong candidates to be used in future generations of rare-earth-free luminescence materials either due to the presence of defects in the band gap or because of intrinsic charge transfer transitions. − Pyrophosphate hosts belong to the category of ideal oxide-based hosts and have been explored extensively from a luminescence point of view in the field of lanthanide-activated phosphors, persistent phosphors, dosimetry, UV-emitting phosphors for biocidal applications, contrast agents for nuclear magnetic resonance imaging (MRI), − etc.…”

Sonochemical preparation and characterization of Sm‐doped GO/KSrPO4 nanocomposite photocatalyst for degradation of methylene blue dye

“…In fact, it is attached to GO by interacting with the oxygen functionalities. Further, the peak at 1003 cm −1 is a characteristic of antisymmetric stretching mode of P–O bond representing the (PO 4 ) −3 in KSrPO 4 (Patel et al, 2015). Also, the peak at 555 cm −1 is a characteristic of antisymmetric bending vibration of P–O bond representing the (PO 4 ) −3 in KSrPO 4 (Patel et al, 2015).…”

“…Further, the peak at 1003 cm −1 is a characteristic of antisymmetric stretching mode of P–O bond representing the (PO 4 ) −3 in KSrPO 4 (Patel et al, 2015). Also, the peak at 555 cm −1 is a characteristic of antisymmetric bending vibration of P–O bond representing the (PO 4 ) −3 in KSrPO 4 (Patel et al, 2015). However, this peak also represents the Sm–O bond with no other peak confirming the undisturbed FTIR spectrum (Wattanathana et al, 2017).…”