Impregnation of Ce³⁺ in YPO₄ Lattice for Enhanced Green Emission for Biomedical Applications

Abstract:

Green light-emitting YPO₄:Tb³⁺ and YPO₄:Tb³⁺: Ce³⁺ nanoparticles were synthesised at low temperatures using the polyol method. The phase purity, micromorphology and luminescence characteristics were studied using Transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier Transfer Infrared absorption spectroscopy (FT-IR) and Photoluminescence spectroscopy (PL). Combined XRD and TEM analysis showed that the YPO₄ nanoparticles crystallised into a single phase of tetragonal (I41/amd) structure. For all samples, the emission intensity at λ_em=543 nm assigned to ⁵D₄→⁷F₅ is more prominent than ⁵D₄→⁷F₆ with a maximum at λ_em=488 nm, and the asymmetric ratio was calculated and analysed. The asymmetric ratio is strongly correlated with the symmetry around the local environment of Tb³⁺ ions. A significant increase in the asymmetric ratio is observed with an increase in annealing temperature. The energy transfer from Ce³⁺ ions to Tb³⁺ ions was tested by studying the photoluminescence properties of YPO₄:Tb³⁺ and YPO₄:Tb³⁺: Ce³⁺ nanoparticles and how it results in the improvement of the luminescence intensity. The Ce³⁺ 5d−4f and Tb^{3+ 5}D₄→⁷F_J (J = 6 − 3) transitions were observed.

• Periodical: Advanced Materials Research (Volume 1180)
• Pages: 53-65
• DOI: https://doi.org/10.4028/p-fSrx56
• Online since: August 2024
• Authors: Davidson Pyngrope*, Phlegon Syndai, Amresh I. Prasad
• Keywords: Annealing, Emission Intensity, Energy Transfer, Excitation, Polyol Method

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