Ag增强ZnO微米棒偏振发光

Ag Enhanced Polarization Fluorescence of ZnO Microrod

摘要: 为了提高各向异性形貌的ZnO微米棒的偏振发光，通过水热法制备出了ZnO微米棒，再采用柠檬酸钠还原法制备出了ZnO/Ag微米棒。实验结果表明，制备出的微米棒呈哑铃型，横纵比约为6，ZnO微米棒中不含其它杂质。光致发光图表明，ZnO微米棒紫外发光峰峰形呈高斯对称，发光在380 nm左右，而在可见光区，在540 nm左右观测到一个较弱的宽发光峰。在与Ag复合后，ZnO微米棒的光致发光以及光吸收都获得提高。在325 nm He-Cd激光器激发下，通过计算ZnO微米棒的偏振度为0.31，ZnO/Ag微米棒的偏振度为0.44，表明与Ag复合后，ZnO微米棒的偏振获得提高，这使得其在紫外偏振探测等领域具有良好的应用前景。

Abstract: In order to improve the polarization luminescence of ZnO microrods with anisotropic morphology, ZnO microrods were prepared by hydrothermal method, and ZnO/Ag microrods were prepared by reduction method using sodium citrate. The experimental results show that the prepared microrods are dumbbell shaped. The transverse to longitudinal ratio is about 6. No obvious impurities were found in ZnO microrods. Photoluminescence characterization shows that the UV luminescence of ZnO microrods is Gaussian symmetric with a peak center at 380 nm. In the visible region, a weak and wide luminescence peak was observed at about 540 nm. The introduction of Ag improves the luminescence and absorption of ZnO microrods. Under the excitation of 325 nm linearly polarized light, the polarization ratio of ZnO microrods is 0.31. The polarization ratio of ZnO/Ag microrods is 0.44. The enhancement in polarization indicates that the ZnO/Ag composites have a good application prospect in the field of ultraviolet polarization detection.