To convert ultraviolet (UV) light into near-infrared (NIR) light in phosphors is demanded for the development of solar cells. A series of NaYF4:Nd3+,Yb3+ white powder samples were prepared via the hydrothermal method. The crystal structure and photolu-minescence properties of the samples were carefully studied using X-ray diffractometry (XRD) and photoluminescence spectra. The excitation and emission spectra of NaYF4:Nd3+,Yb3+ samples and the luminescence decay curves of Nd3+ and Yb3+ revealed an effi-cient energy transfer process from Nd3+ to Yb3+. This process resulted in the Yb3+ NIR fluorescent emission at 980 nm. Moreover, the lifetime of the Nd3+4F3/2 level decreased with the increase of Yb3+ doping concentration. The build-up time of the decay curves of the Yb3+2F5/2 level further verified the energy transfer process. Meanwhile, energy transfer efficiency based on different Yb3+ doping concentrations was achieved.
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