ZnO纳米棒的低温溶液法制备、光电特性研究及其在有机/无机复合电致发光中的应用

Optoelectronic properties of ZnO nanorods fabricated by hydrothermal decomposition and its applications in organic/inorganic electroluminescence heterostructure

利用水热法制备了垂直于衬底的定向生长的ZnO纳米棒,利用扫描电子显微镜及光致发光的方法对其形貌及光学特性进行了表征,利用场发射性能测试装置对ZnO纳米棒的场发射性能进行了测试.结果表明:利用水热法在较低的温度(95℃)下生长了具有较好形貌和结构的ZnO纳米棒,并表现出了较好的场发射特性,当电流密度为1μA/cm2时,开启电场是2.8V/μm,当电场为6.4V/μm时,电流密度可以达到0.67mA/cm2,场增强因子为3360.稳定性测试表明,在5h内,4.5V/μm的电场下,其波动不超过25%.将制备的ZnO纳米棒应用到有机/无机电致发光中,其中ZnO纳米棒为电子传输层,m-MTDATA(4,4′,4″-tris{N,(3-methylphenyl)-N-phenylamino}-triphenylamine)为空穴传输层,得到了ZnO的342nm的紫外电致发光,此发光较ZnO纳米棒光致发光的紫外发射有约40nm的蓝移.

The ZnO nanorods, primarily aligned perpendicular to the substrate, have been fabricated by hydrothermal decomposition. The scanning electron microscopy and photoluminescence method were used to characterize their morphology and optical properties,respectively. The field emission properties were also studied. The results indicate that the ZnO nanorods present good morphology,structure and good field emission property. The on-set field is 2. 8 V /μm at a current density of 1 μA /cm2. The emission current density can reach 0. 67 mA /cm2 at 6. 4 V /μm. The field emission enhancement factor is 3660. Fluctuation of the current density is less than 25% at 4. 5 V /μm for 5 hours. In the organic / inorganic electroluminescence heterostructure,with the ZnO nanorods as the electron transport layer and the m-MTDATA （4,4′,4″-tris { N,（ 3-methylphenyl）-N-phenylamino}-triphenylamine） as the hole transport layer,the ultra-violet emission of ZnO nanorods was obtained with a 40 nm blue-shift compared with the photoluminescence of the ZnO nanorods.