Structural properties and near-infrared light from Ce3+/Nd3+-co-doped LaPO4 nanophosphors for solar cell applications.

To enhance the spectral response of solar cells, an experimental study on LaPO₄:0.01Ce³⁺/xNd³⁺ (x = 0, 2, 4 mol%) was carried out, where structural and morphological properties of the prepared samples were well characterized by the means of X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electronic microscope. Additionally, the photoluminescence behavior of phosphors in ultraviolet–visible (UV–VIS) and Near-infrared (NIR) regions were investigated to confirm the energy transfer (ET) from Ce³⁺ to Nd³⁺. Moreover, the quantum efficiency of Ce³⁺/Nd³⁺-co-doped samples was estimated as high as ~ 172% and the possible ET process was described. Accordingly, the LaPO₄:Ce³⁺/Nd³⁺ phosphors can convert the UV light (275 nm) into NIR photons (approx. 1059 nm) through the possible two-pathway energy transfer processes from Ce³⁺ sensitizer ions to Nd³⁺ activators. Obtained NIR down-conversion emissions are suitable for improving the conversion efficiency of c-Si solar cells. [ABSTRACT FROM AUTHOR]