Influence of Microstructure Modulation of Er~（3＋）-Doped Al_2O_3 on the Photoluminescence Performance

采用溶胶–凝胶法分别制备了掺不同摩尔分数Er3＋的Er3＋：Al2O3粉末和不同摩尔分数Y3＋的0.5%Er3＋：Al2O3（Y3＋：0.5%Er3＋：Al2O3）粉末。利用Y3＋与Al3＋的半径差异,通过共掺不同掺量的Y3＋来调制Al2O3的微结构,用X射线衍射和透射电子显微镜分析样品的结构特征,并通过光致发光光谱研究样品的光致发光特性。结果表明：不同Y3＋和Er3＋共掺杂的Y3＋：Er3＋：Al2O3样品均以-Al2O3为主相;随着Y3＋掺量的增加,Al2O3的晶格缺陷逐渐增多;样品的荧光强度、发射谱宽度及荧光寿命也都随着Y3＋掺量增大而增大。通过Y3＋掺量调制Er3＋所处微结构环境的方法有效地改善了Er3＋：Al2O3材料的发光特性。

Influence of Microstructure Modulation of Er3+-Doped Al2O3 on the Photoluminescence Performance

The Al2O3 powders doped with different mole fractions of Er 3+ and those co-doped with Er 3+ ion of 0.5% and different mole fractions of Y3+ ion were prepared by a sol–gel method. Due to the radius difference between Y3+ ion and Al3+ ion, the microstructure of Al2O3 could be modulated by co-doping with different mole fractions of Y3+ . The structure of the powder samples were determined by X-ray diffraction and transmission electron microscopy, respectively, and the photoluminescence (PL) characteristics were analyzed via the PL spectra. The results show that the primary phase of Y3+ and Er3+ co-doped Al2O3 samples is δ-Al2O3 . The lattice defects, the PL intensity, spectral width and PL lifetime of samples increased with increasing the doping quantity of Y3+ ion. The PL property of Er3+ -doped Al2O3 powders was improved effectively via the modulation of the microstructure environment of Er 3+ by doping with different quantities of Y 3+ ion.