Abstract
Nanosized europium phosphates Eu3PO7, Eu(PO3)3, and Eu(PO3)3: Eu2+ have been prepared by low-temperature extraction-pyrolytic method. Optimal temperature and time of precursor pyrolysis for preparing luminophor containing europium in different oxidation states have been determined. Phosphate luminophore based on Eu3+ exhibit intense red luminescence with λmax ∼ 600–650 nm. Luminescence spectra of Eu(PO3)3: Eu2+ are characterized by emission bands in the region 400–700 nm typical for both Eu3+ (the bands of 5D0–7Fj(j = 0, 1, 2) transitions), and Eu2+ (the band of 4f65d → 8S7/2 transition). Luminescence-exciting wavelengths provide different contribution to the radiation intensity of both Eu2+ and Eu3+.
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