Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11006565 | Journal of Luminescence | 2018 | 26 Pages |
Abstract
Er3+/Tm3+/Yb3+ tri-doped YNO phosphors were obtained by the solid-state reaction method. X-ray diffraction, Raman spectroscopy, and FE-SEM were employed for characterization of the materials, and no significant structural changes have been noticed. The materials exhibited red, green and blue (RGB) upconversion emissions under 980â¯nm excitation. The increase of the Tm3+ concentration reduced the blue and green UC emissions due to possible Tm3+-Tm3+ and Er3+-Tm3+ energy transfer processes, respectively. White UC emission with CIE color coordinates equal to xâ¯=â¯0.31 and yâ¯=â¯0.35 has been obtained in the YNO:0.5%Er3+2.0%Tm3+20%Yb3+ composition under 64.5â¯mW/cm2. The tri-doped systems presented color tunability behavior indicating that multicolor, such as white light, can be easily achieved by adjusting of the Tm3+ and Yb3+ contents.
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Authors
Felipe F. do Carmo, João P.C. do Nascimento, Marcello X. Façanha, T.O. Sales, W.Q. Santos, Artur S. Gouveia-Neto, Carlos Jacinto, Antonio S.B. Sombra,