Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11006546 | Journal of Luminescence | 2018 | 34 Pages |
Abstract
BaBi2Nb2O9:Li+/Tm3+/Er3+/Yb3+ phosphors were successfully synthesized by the high-temperature solid-state method and up-conversion white-light emission has been achieved by tuning of the Tm3+ and Li+ contents. X-ray diffraction and room temperature photoluminescence were used, respectively, to investigate the structural and optical properties of the luminescent systems. Decay dynamics of 4F9/2 levels in BBN:Tm3+/Er3+/Yb3+ and BBN:Er3+/Yb3+ phosphors have been analyzed to study the energy-transfer mechanism between Er3+ and Tm3+ ions. The introduction of Li+ ions into the BBN:0.5%Tm3+0.05%Er3+8%Yb3+ has induced an adjustment of tristimulus values shifting the chromaticity color coordinates of the phosphor towards to the ideal white region (xâ¯=â¯0.31 and yâ¯=â¯0.34). Furthermore, the high color purity white-light coming from the BBN:2%Li+0.5%Tm3+0.05%Er3+8%Yb3+ composition was obtained under moderate power density establishing the BBN phase as a host matrix able to generate RGB with energy saving.
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Authors
Marcello X. Façanha, Felipe F. do Carmo, João P.C. do Nascimento, Tasso O. Sales, Weslley Q. Santos, Artur S. Gouveia-Neto, Carlos J. da Silva, Antonio S.B. Sombra,