Er^(3+)掺杂氧化铝的微结构调制对发光性能的影响

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。

The Al2O3 powders doped with different mole fractions of Er3＋ and those co-doped with Er3＋ 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 micro-structure 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 Er3＋ by doping with different quantities of Y3＋ ion.