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Abstract
The β-Ca2SiO4: (Er3+, Yb3+) powders were synthesized by the simple solid-state process. The obtained samples were given characterizations of X-ray diffraction, Fourier-transform infrared, transmission electron microscopy, and luminescence. The samples have monoclinic parawollastonite phase and irregular morphology. Under the excitation at 980 nm, the obtained β-Ca2SiO4: (Er3+, Yb3+) samples show the intense upconversion (UC) emission. The dosage of Yb3+ has obvious influence on the emission intensities of β-Ca2SiO4: (Er3+, Yb3+) samples. Also, the emission intensity increases gradually with the increasing pump power from 350 to 600 mW. On the basis of luminescent properties of samples, we can conclude that the UC emission originates from the biphotonic process.