微量钛掺杂的纳米二氧化锆相变过程中的光学性质

Influence of Phase Transition on Photoluminescence Properties of Trace Ti Doped Nano-zirconia

微量钛掺杂的纳米氧化锆由于纳米"小尺寸效应"的影响,在材料中产生了过量的氧空位缺陷,这些氧空位缺陷使得氧化锆在室温下呈现出高温的四方相。这种晶相的变化对氧化锆的光学性质产生了很大的影响。在氧化锆从四方相向单斜相的转变过程中,位于470 nm位置的Ti发光中心的宽带发光以及相同位置的余辉发光得到了增强。

Trace Ti doped nano-zirconia was prepared via the one-pot reaction,and its phase transition and luminescence properties were characterized.It is believed that generation of excess oxygen vacancies within the trace Ti doped ZrO2 nanocrystalline is primarily responsible for the room temperature tetragonal phase stabilization below a critical size.Luminescent properties of ZrO2 are greatly affected by the oxygen vacancies in the phase transition process,leading to the enhancement of the 470 nm phosphorescence and the identical color long afterglow.