Abstract
LaF3 Crystalline powders doped with Ho3+and Yb3+ were prepared by co-precipitation method.The samples were characterized by XRD.Single-phase LaF3∶Ho3+,Yb3+ powders with hexagon structure were obtained in our experimental process.Excitation spectra,emission spectra,and decay curves were used to characterize the samples at room temperature.The energy transfer from Ho3+ to Yb3+ was confirmed.Further it is recognized as a resonant energy transfer process.Through the process,the samples could absorb ultraviolet photons with 300~360 nm band and emit two near-infrared photons around 1 μm.This result reveals the possibility of violet to near-infrared quantum cutting with a quantum efficiency larger than 100% in Ho3+/ Yb3+ co-doped fluorides,suggesting the possible application in modifying the solar spectrum to enhance the efficiency of silicon solar cells.
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