Lithium carbonate flux was introduced in the preparation of La2O2CO3: Eu3+ oxycarbonate phosphor particles to improve the photoluminescence intensities. The flux treatment brought increasing in the crystallinity of oxycarbonate phosphor accompanying the phase transition from the two-phase mixture of tetragonal and monoclinic forms to single hexagonal phase of rare earth oxycarbonate, resulting in the increase of the emission intensity.
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Tamura et al. (2003) studied this question.
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