White light upconversion emission and color tunability in Er3+/Tm3+/Yb3+ tri-doped YNbO4 phosphor
| Autor: | Marcello X. Façanha, Antonio Sergio Bezerra Sombra, Carlos Jacinto, Felipe F. do Carmo, Artur S. Gouveia-Neto, W.Q. Santos, Tasso O. Sales, João P.C. do Nascimento |
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| Rok vydání: | 2018 |
| Předmět: |
Diffraction
Materials science Doping Biophysics Analytical chemistry Phosphor 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Atomic and Molecular Physics and Optics Photon upconversion 0104 chemical sciences symbols.namesake White light symbols RGB color model 0210 nano-technology Raman spectroscopy Excitation |
| Zdroj: | Journal of Luminescence. 204:676-684 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2018.08.079 |
| Popis: | 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 980 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 x = 0.31 and y = 0.35 has been obtained in the YNO:0.5%Er3+2.0%Tm3+20%Yb3+ composition under 64.5 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. |
| Databáze: | OpenAIRE |
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