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The composition of Ba/Sr in Ba x Sr 1−x TiO 3 phosphors doped with Er 3+ has been varied to investigate the effect of phase structure on the upconversion photoluminescence properties. XRD results suggest that phase transition from tetragonal to cubic phase occurs at room temperature near x=0.7. Under the excitation of 980nm laser, the quenching of green upconversion...
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