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A new series of CaYb2−xErxGe3O10 (x = 0–2) germanates has been prepared by conventional solid state reaction and an EDTA-assisted precursor route. Strong upconversion luminescence has been detected under 980 nm diode laser excitation. Concentration dependencies study shows that the highest intensity of the lines around 408 nm (2H9/2 → 4I15/2), 524 nm (2H11/2 → 4I15/2), 548 nm (4S3/2 → 4I15/2) and...
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