摘要
采用热蒸发法成功制备了Al掺杂四针状ZnO纳米结构(T-AZO),利用扫描电子显微镜、X射线衍射仪、荧光光谱仪和场发射测试系统分别研究了不同Al摩尔分数对T-AZO纳米结构表面形貌、微结构、光致发光谱和场发射特性的影响。实验结果表明:T-AZO纳米结构呈现六角纤锌矿结构,Al掺杂对四针状ZnO纳米结构的形貌产生明显影响并且使紫外发射峰产生蓝移。实验中,当Al掺杂摩尔分数为3%时,场发射性能最好,其开启场强为1.33 V/μm,场增强因子为8 420。
High-quality tetrapod-shaped Al-doped ZnO( T-AZO) nanostructures were synthesized via thermal evaporation of mixed Zn and Al powders. The effects of Al dopant concentration on the morphology,microstructure,optical and field emission( FE) properties of T-AZO were investigated using scanning electronic microscopy( SEM),X-ray diffraction( XRD),photoluminescence( PL)spectra and FE measurement. It is found that the incorporation of Al increases the aspect ratio of the tetrapods,leads to blue-shift in the UV region,and significantly improves the FE performances. The results also show that tetrapod cathodes with 3% Al mole fraction have the best FE properties,with a turn-on field of 1. 33 V / μm,and a field enhancement factor as high as 8 420. The superior FE properties are mainly attributed to the high aspect ratio of the legs in the unique tetrapod-liked structures,and more electrons being induced in the conduction band by Al dopand.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2013年第11期1424-1429,共6页
Chinese Journal of Luminescence
基金
国家自然科学基金(61306071)
福建省教育厅项目(JK2012001)
福建省自然科学基金(2013J01236)资助项目
关键词
四针状ZnO
AL掺杂
热蒸发
光致发光
场致发射
ZnO tetrapods
Al doping
thermal evaporation
photoluminescence
field emission
