(School of Materials Science and Engineering, Central South University, Changsha 410083, China)
摘 要: 采用聚丙烯酰胺凝胶法制备Al掺杂ZnO(AZO)前驱体，在500和600 ℃下煅烧获得AZO粉体。采用DSC、XRD、SEM、UV-vis吸收和荧光发光(PL)对粉体进行表征，研究Al掺杂浓度对AZO粉体光学性能的影响。结果表明：在600 ℃煅烧温度下，Al3+的固溶度可高达8%(摩尔分数)，掺杂后的AZO粉体晶粒尺寸明显减小；随着掺杂浓度提高，AZO粉体的紫外吸收波长先“蓝移”而后“红移”，当Al掺杂浓度为5.5%(摩尔分数)时，紫外吸收波长最短，为367 nm(3.38 eV)；未掺杂与Al掺杂的ZnO粉体均具有406 nm的近边紫外峰和430 nm的蓝光发射峰。
关键字: AZO粉体；UV-vis吸收；光致发光；聚丙烯酰胺凝胶法；紫外发射；蓝光发射
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Al-doping-ZnO (AZO) precursors were successfully synthesized by the polyacrylamide gel rout. The AZO powders were obtained at the calcining temperatures of 500 and 600 ℃. The powders were characterized with DSC, XRD, SEM, UV-vis spectrometer and luminescent spectrometer. The influence of Al concentration in the solution on optical properties of AZO powders was investigated. The results show that Al doping concentration in the solution is 8% (mole fraction) at the calcining temperature of 600 ℃. The grain size of powders decreases with increasing Al concentration. A blue shift of the UV-vis absorbance wavelength is observed firstly, and then a red shift later with increasing Al concentration. While the Al concentration reaches 5.5% (mole fraction), the shortest absorbance wavelength is 367 nm (3.38 eV). The UV peak of 406 nm and blue emission peak of 430 nm are detected in both non-doped and doped samples.
Key words: AZO powder; UV-vis absorbance; photoluminescence; polyacrylamide gel rout; ultraviolet emission; blue emission
