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• W2609989542 abstract "Praseodymium (Pr3+) doped mixed lanthanum yttrium oxyorthosilicate (LaYSiO5) powder phosphors were synthesized using urea-assisted combustion method. The molar ratio of La:Y were varied in the following manner: La2-xYxSiO5 (x = 0, 0.5, 1, 1.5, 2), were x = 0 is pure La2SiO5, x = 2 is pure Y2SiO5 and x = 0.5, 1, and 1.5 are the admixtures of the two compounds. The X-ray diffractometer results showed that the La2SiO5 and Y2SiO5 crystalized in their pure monoclinic phases, while their admixtures are both present in the same phase. The Burstein–Moss (BM) shift was used to explain the increase observed in the band gap after doping. The influence of the host crystal field on the branching ratios of the photoluminescence emission intensities of the 3P0 and 1D2 energy levels of Pr3+ were studied. The electronic transition from the 3P0 transition dominated the emission spectra when x = 0, while the 1D2 electronic transition dominated when x = 2. The variation in the branching ratios of the 3P0 and 1D2 emission with the change in the molar ratio of La:Y could be due to 3P0 → 1D2 non-radiative transitions, which increased with the crystal field of the host as the value of x increased (i.e., as the molar ratio of Y increases). Furthermore, it was shown that the 3P0 emission lines emerged from Pr3+ ions occupying La1 and Y1 sites of La2SiO5 and Y2SiO5 respectively, while the 1D2 emission lines emerged from Pr3+ ions occupying La2 and Y2 sites. The decay curve showed three lifetime components from both 3P0 and 1D2 emission lines, with the 1D2 lines having higher lifetimes in all cases." @default.
• W2609989542 created "2017-05-05" @default.
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• W2609989542 date "2017-10-01" @default.
• W2609989542 modified "2023-10-18" @default.
• W2609989542 title "The dynamics of the photoluminescence of Pr 3+ in mixed lanthanum yttrium oxyorthosilicate hosts" @default.
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• W2609989542 doi "https://doi.org/10.1016/j.snb.2017.04.181" @default.
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