Abstract
An efficient near-infrared (NIR) quantum cutting (QC) by converting ultraviolet into NIR via cooperative downconversion (DC) for the (Nd3+, Yb3+) couple in CaWO4 is studied since efficient two-step energy transfer occurs from the 4G9/2 level of Nd3+ to two neighboring Yb3+:2F5/2 level. The authors have analyzed the measured luminescence spectra and decay lifetimes for different Yb3+ concentrations and proposed a mechanism to rationalize the DC effect. The maximum quantum efficiency (QE) of Nd3+ is up to 164.03 %. Application of the broadband NIR-QC phosphors might enhance the performance of silicon-based solar cells.
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