Abstract
An efficient near-infrared (NIR) quantum cutting (QC) phosphor, CaNb2O6:Yb3+, has been developed to realize broadband downconversion from ultraviolet (UV) into NIR. Upon the excitation of UV light in the broad absorption band of niobate groups, an intense NIR emission of Yb3+ ion around 1μm, matching the maximum spectral response of Si-based solar cells very well, was obtained. Through the analyses of the measured luminescence spectra and decay lifetimes, a mechanism of energy transfer from niobate groups to Yb3+ ions was proposed to rationalize the downconversion process. This broadband NIR QC phosphor might have potential application in enhancing response of Si-based solar cells via spectral modification.
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