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Yb3+-doped langbeinite salts were prepared by the solid solution method. X-ray diffraction patterns and vibrational spectroscopy confirmed that all obtained phases are highly pure, iso-structural and they crystallize in the cubic system with the space group P213. The emission luminescence comes from the 2F5/2→2F7/2 transition of Yb3+ ions. Moreover, intense blue cooperative emission was observed at...
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