A Facile Co-Precipitation Synthesis and Luminescence Properties of Red-Emitting La₂O₂SO₄: x%Eu³⁺ Nanophosphors

Abstract:

A series of Eu³⁺ ions activated La₂O₂SO₄ nanophosphors had been prepared successfully by a facial co-precipitation route followed by a subsequent calcination treatment. The commercial Eu₂O₃, La₂O₃, HNO₃, (NH₄)₂SO₄ and NH₃·H₂O were used as the raw materials. The structural analyses and luminescence properties of as-prepared products were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and photoluminescence (PL) spectra. Pure La₂O₂SO₄ quasi-sphere nanoparticles with an average diameter of 40 nm were successfully prepared by calcining the precursor at 800 °C for 2 h in air. PL results reveal that the strongest red emission peak is centred at 617 nm upon 393 nm light excitation, corresponding to the ⁵D₀→⁷F₂ transition of Eu³⁺ ions. Its quenching concentration is 9 mol%, which can be attributed to the exchange interaction among Eu³⁺ ions and the corresponding decay process shows a double exponential decay behavior, with 0.310 μs for t₁ and 1.419 μs for t₂.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 679-685
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.679
• Online since: August 2018
• Authors: Fan Liu, Jing Bao Lian*, Guang Xi Xu, Nian Chu Wu
• Keywords: Co-Precipitation, Lanthanide Oxysulfates, Luminescence Properties, Nanophosphors

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