Sulfate-Ion Pillared Layered Hydroxide of Eu₂(OH)₄SO₄·nH₂O: Controlled Hydrothermal Processing, Thermal Decomposition, and Photoluminescence

Abstract:

Sulfate-ion pillared layered hydroxide of Eu₂(OH)₄SO₄·nH₂O (n~2, SO₄^2--LEuH) was synthesized through controlled hydrothermal reaction, and the phase evolution of which upon calcination in the air and hydrogen was studied in detail. It was found that annealing in the air produced orthorhombic Eu₂O₂SO₄ in the temperature range of 300-1000 °C while in flowing H₂ hexagonal Eu₂O₂S was resulted in the 600-1000 °C range. Strong red emissions were found at 621 nm for the SO₄^2--LEuH and 627 nm for Eu₂O₂S under excitation at 396 nm (the ⁷F₀-⁵L₆ transition of Eu³⁺). Improved luminescence intensity was also observed for the Eu₂O₂S powder calcined at a higher temperature.

• Periodical: Key Engineering Materials (Volume 633)
• Pages: 98-102
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.633.98
• Online since: November 2014
• Authors: Xue Jiao Wang, Ji Guang Li*, Qi Zhu, Xu Dong Sun
• Keywords: Eu₂(OH)₄SO₄·nH₂O, Hydrothermal Synthesis, Phase Evolution, Photoluminescence (PL)

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