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Er 3+ -doped gallium tellurite glasses have been fabricated and characterized. Efficient green and red upconversion luminescence, and strong infrared fluorescence at 1.53 μm wavelength were observed under the excitation of a 975 nm diode laser at room temperature. The visible upconversion emission bands centered at 524, 546 and 669 nm have been confirmed that two photons contribute to the...
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