Abstract
Abstract Mn4+/Yb3+ co-doped CaGdAlO4 are prepared to achieve efficient spectral conversion. XRD Rietveld refinement analysis is performed to obtain the structural information of the synthesized materials. The results indicate the Al3+ and Gd3+ sites are substituted by the Mn4+ and Yb3+ ions, respectively. Intense NIR emission within the most sensitive response region of c-Si solar cells is observed under UV–visible excitation, indicating the existence of efficient energy transfer from Mn4+ to Yb3+ ions. The dipole-dipole interaction is verified to be the dominant energy transfer mechanism among the Mn4+-Yb3+ pair. The linear dependence of energy transfer rate on the Yb3+ concentration indicates that one NIR photon is generated with the absorption of one UV–visible photon. The broad excitation spanning from 250 to 600 nm monitored at NIR emission demonstrates that the Mn4+ ions in the CaGdAlO4 host can be efficient sensitizers for Yb3+ ions to enhance the performance of c-Si cells.
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