Efficient near-infrared quantum cutting in Tb3+,Yb3+ codoped LuPO4 phosphors

AM1.5G solar spectra (blue line) and spectral response of a single-junction Si solar cells (purple line) as the background (a); normalized excitation (PLE) spectra monitored at 1003 nm (blue line) and near infrared emission (PL) spectra (red line) of LuPO4:1%Tb3+,10%Yb3+ sample under 489 nm excitation (b)