Recently, there have been extensive studies on luminescent materials-based lanthanide ions for solar cells application. Down-conversion (DC) luminescent materials have been proposed to enhance the energy conversion efficiency of solar cells through photon conversion process. DC converts single high energy photons into two near-infrared photons. DC materials are actively explored for reducing the spectrum mismatch loss and enhancing the efficiency of solar cells. The most studied couple for c-Si solar cells are Ln3+ -Yb3+ (Ln = Pr, Er, Ho, Tb, Nd and Tm) activated different host materials.