多孔结构ZnO及其电致发光性能

Hierarchically Porous ZnO and Its Electroluminescence Characteristics

利用Sol-gel法制备了含制孔剂P123的ZnO前驱体,通过无皂乳液聚合法和分步乳液聚合法制备了不同粒径的PS小球,采用共沉积法得到P123-PS-ZnO凝胶。高温煅烧去除有机模板剂P123和PS,从而制备出系列孔径可控的多孔ZnO电致发光材料。研究表明,多孔结构可以显著改善ZnO的电致发光性能;ZnO发光强度随PS粒度的改变而改变,当使用100nm PS小球为模板时,多孔ZnO材料的相对发光强度较未使用PS模板提高了4.03倍。

ZnO precursor with P123 was prepared by the method of sol-gel. By the means of emulsifier-free polymerization approach and two-step emulsion polymerization approach, PS spheres with different diameters were prepared. The PS spheres and ZnO precursor were mixed together to prepare the P123-PS-ZnO gel by the method of co-deposition. After removing the organic template P123 and PS of the P123-PS-ZnO gel by annealing, the hierarchical pore structure of ZnO could be obtained. The investigation of electroluminescence（EL） spectra shows that hierarchical pore structure is able to largely improve the ZnO EL performance. The luminous intensity alter with the change of diameter of PS spheres. When the diameter of PS sphere reaches 100nm, the relative luminous intensity of the hierarchical porous ZnO material is 4. 03 times more than that of the sample without PS template.