Low-temperature synthesis and luminescent properties of lanthanum metaphosphate LaP3O9 : Tb

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Abstract

Promising for inorganic luminophores, terbium-doped lanthanum metaphosphates La1-xTbxP3O9 (x = 0.05, 0.1, 0.2, 0.3, 0.4) were synthesised by extraction-pyrolytic method at low temperature in comparison with known methods. The crystal structure and optical properties of the obtained samples were characterised by X-ray phase analysis, IR and luminescence spectroscopy, and the unit cell parameters were calculated. Сompounds having rhombic structure, pr. gr. C 222 1, were obtained in the temperature range of 500–900°C. All parameters of the unit cell decrease linearly with the introduction of terbium into lanthanum metaphosphate. La1-xTbxP3O9 compounds show intense luminescence in the region of 450–650 nm. The La0.8Tb0.2P3O9 sample obtained in one hour annealing at pyrolysis temperature of 900°C shows maximum luminescence intensity.

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About the authors

M. V. Belobeletskaya

Institute of Chemistry of the Far Eastern Branch of the Russian Academy of Sciences

Author for correspondence.
Email: rita@ich.dvo.ru
Russian Federation, Vladivostok, 690022

N. I. Steblevskaya

Institute of Chemistry of the Far Eastern Branch of the Russian Academy of Sciences

Email: rita@ich.dvo.ru
Russian Federation, Vladivostok, 690022

M. A. Medkov

Institute of Chemistry of the Far Eastern Branch of the Russian Academy of Sciences

Email: rita@ich.dvo.ru
Russian Federation, Vladivostok, 690022

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Supplementary files

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2. Fig. 1. Diffraction patterns of the compound LaP3O9 obtained at 400 (1), 500 (2), 900 (3) and 1100°C (4).

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3. Fig. 2. Diffraction patterns of samples of the composition La0.9Tb0.1P3O9 (1), La0.8Tb02P3O9 (2), La0.7Tb0.3P3O9 (3), La0.6Tb0.4P3O9 (4).

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4. Fig. 3. Luminescence excitation spectra of La1 – хTbхP3O9 samples at х = 0.05 (1), 0.1 (2), 0.2 (3), 0.3 (4), 0.4 (5), obtained at 900°С (a), and La0.8Tb0.2P3O9 sample obtained at 700 (1), 800 (2) and 900°С (3); λem = 545 nm, 300 K (b).

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5. Fig. 4. Luminescence spectra of La1 – хTbхP3O9 at х = 0.05 (1), 0.1 (2), 0.2 (3), 0.3 (4), 0.4 (5), obtained at 900°С (a); dependence of the luminescence intensity of compounds on the annealing temperature of precursors (1) and the concentration of Tb3+ ions (2); λex = 241 nm, 300 K (b).

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