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Co-Precipitation Synthesis of La₂O₂SO₄:Tb³⁺ Phosphor and its Conversion to La₂O₂S:Tb³⁺ Ceramic Scintillator via Pressureless Sintering in Hydrogen

G.X. Xu, J.B. Lian, N.C. Wu, X. Zhang, J. He

Journal of Ceramic Science and Technology, Vol. 9, No. 3 (2018), pp. 345-352

DOI: 10.4416/JCST2018-00018

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Abstract

This research reports on the synthesis of a series of lanthanum compounds. As an intermediate product, La2O2SO4:Tb3+phosphors were prepared with a co-precipitation method. La2O2S:Tb3+ ceramic scintillator was then synthesized by means of pressureless reaction sintering in a hydrogen atmosphere. XRD patterns show that the crystal structure of the precursor is unidentified, and it can be transformed into pure La2O2SO4 phase after calcination at 800 °C in air. Compared with the Tb3+-ions-doped precursor, the La2O2SO4:Tb3+ phosphor has a stronger green emission peak at around 542 nm, which is attributed to 5D4→7F5 transition of Tb3+ ions. The La2O2SO4:Tb3+ phosphor exhibits the highest green luminescence when the concentration of Tb3+ is 12 %. The corresponding decay process (5D4→7F4) of the La2O2SO4:12%Tb3+ phosphor can be fitted into a double exponential function with 0.217 μs and 2.212 μs for t1 and t2, respectively. La2O2S:Tb3+ ceramic scintillator could be fabricated by sintering the La2O2SO4:Tb3+ phosphor in a hydrogen atmosphere. It appears greenish yellow with good translucency and light output performance.

Keywords

Lanthanum compounds, co-precipitation, pressureless sintering, photoluminescence, ceramic scintillator

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