Abstract: Ce-doped Y₃Al₅O₁₂(YAG:Ce) nanophosphor was synthesized by the co-precipitation method. X-ray powder diffraction (XRD), Scanning electron microscope (SEM) were used to characterize the powders. The temperature dependences of luminescence and decay time of YAG:Ce nanophosphor were investigated in the temperature range of 80-400K. The luminescence intensity decreases with the increase of temperature, which is caused by the increase of the non-radiative relaxation rate. The decay of YAG:Ce contains two exponential terms, the long component presents decay of Ce³⁺ in the body, the short component reflects decay of Ce³⁺ on the surface. The long component decreases with the increase of temperature, while the short component shows intricate behavior, which results from effect of surface.

Key words: decay time, YAG:Ce nanophosphor, temperature dependence, surface effect