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Pr3+/Yb3+:NaGdF4@ Yb3+:NaYF4 Core/ Shell Nanocrystals: Synthesis, Microstructure and Quantum-Cutting Luminescence

One of the major issues restricting energy efficiency of the c-Si solar cell is the mismatch between the solar spectrum and the bandgap of silicon semiconductor (~1.1 eV). For the photon with energy higher than the bandgap, the excess energy is dissipated through thermalization of charge carriers [1,2]. One promising solution to reduce this energy loss is the spectral modulation via quantum-cutting (QC), i.e., “cutting” one blue incident photon into two near-infrared (NIR) ones to match with the c-Si bandgap.[3,4] To this end, Pr/Yb:NaGdF4@Yb:NaYF4 core/shell nano-structure is designed and fabricated to achieve efficient QC luminescence in the present work.