Ce^(3+)和Yb^(3+)共掺杂的Y_3Al_5O_(12)可见及量子剪裁近红外发光性质

Properties of Visible and NIR Emissions with Quantum Cutting in Ce^(3+)-Yb^(3+)-codoped Y_3Al_5O_(12) Powder Materials

室温下观察了YAG∶Ce和YAG∶Ce,Yb材料在可见以及近红外区域的发光特性,并通过对Ce3+的5d能级辐射跃迁寿命以及Yb3+的2F5/2能级布居时间和辐射跃迁寿命的比较研究,提出了光诱导的电荷转移态以及电荷转移辐射跃迁的能量传递机制,同时借助于能级图描述了从Ce3+到Yb3+的量子剪裁近红外发光过程。

Ce3+- and Yb3+-doped YAG powders were prepared and the energy transfer(ET) mechanism with(Ce3+)*-Yb3+ charge transfer transition in the powders was evaluated by the photoluminescence(PL),the photoluminescence excitation(PLE) and the lifetime.The possibility of the NIR emission of QC was also discussed because the 1 000 nm emission of Yb3+ just meets the largest spectral response of c-Si solar cells,which may have potential application in enhancing the conversion efficiency of c-Si solar cells.