Er3+及Er3+/Yb3+掺杂ZrO2-Al2O3的制备及发光性质

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547 nm、560 nm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⁺）.

Preparation and Luminescent Propeties of Er3+and Er3+/Yb3+ Codoped ZrO2-Al2O3

NanocrystallineZrO₂-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⁺/ Zr⁴⁺).