Er^(3+)及Er^(3+)/Yb^(3+)掺杂ZrO_2-Al_2O_3的制备及发光性质

Preparation and Luminescent Propeties of Er^(3+) and Er^(3+)/Yb^(3+)Codoped ZrO_2-Al_2O_3

采用共沉淀法制备了纳米晶ZrO2-Al2O3∶Er3+发光粉体.所制备的粉体室温下具有Er3+离子特征荧光发射,主发射在绿光,其中位于547nm、560nm的绿光最强,并得出稀土离子与基质之间有能量传递.对不同煅烧温度下的样品研究表明:因不同温度下所制得的样品晶相不同.研究了纳米晶ZrO2-Al2O3∶Er3+及ZrO2-Al2O3∶Er3+/Yb3+的上转换发光,并分析了上转换的跃迁机制.发现ZrO2-Al2O3∶Er3+的绿光为双光子过程,而ZrO2-Al2O3∶Er3+、Yb3+的上转换光谱中,红光和绿光也为双光子过程,而极弱的蓝光为三光子过程.讨论了Er3+的浓度猝灭现象.最适宜掺杂浓度的原子分数为2%(Er3+/Zr4+).

Nanocrystalline ZrO2-Al2O3∶Er3＋ luminescence powders are prepared by co-precipitation method.The room temperature sharp characteristics emissions of Er3＋ ions are observed,in which green light at 547,560 nm is the strongest.There exists the energy transfer between the matrix and rare earth ions Er3＋.Samples with different sintering temperature are studied.The results show the samples with different sintering temperature display different crystalline phase.The up-conversion luminescence of nanocrystalline ZrO2-Al2O3∶Er3＋ and ZrO2-Al2O3∶ Er3＋/ Yb3＋ are studied and the transition mechanism of the up-conversion are discussed.It is found that the red and green emissions of ZrO2-Al2O3∶Er3＋ are two-photon process.In the up-conversion spectrum of ZrO2-Al2O3∶ Er3＋ / Yb3＋ the red and green emissions are also two-photon process,but very weak blue emission is the three-photon process.Concentration quenching of the ions Er3＋ is discussed.The most appropriate doping concentration is 2%（Er3＋/ Zr＋4）.