An efficient light converter YAB:Cr 3+ ,Yb 3+ /Nd 3+ with broadband excitation and strong NIR emission for harvesting c-Si-based solar cells

The Cr 3+ –Yb 3+ co-doped YAB could convert almost high-energy UV-Vis photons into low-energy NIR photons efficiently, which benefits the enhancement of silicon solar photovoltaic conversion efficiency.