紫外光激发下氧化锌纳米线的发光特性研究

室温条件下，用355 nm的激光激发氧化锌纳米线，测量了其发光光谱.观察到半宽度较小、峰值波长约382 nm的紫光峰和半宽度较宽、峰值波长约507 nm的绿光峰；两峰的发光强度随激发光功率密度的变化而变化，且均存在饱和效应，但各自的变化规律及饱和值的大小不同；紫光峰的中心波长随激发光功率密度的增加而发生了明显的红移.对两峰产生的机理、强度饱和值存在的原由、强度随激发光功率密度变化及紫光峰红移的起因进行了分析.

Photoluminescence Properties of ZnO Nanowires Exited with Ultraviolet Light

Photoluminescence (PL) spectra of ZnO nanowires exited with 355nm laser pulse at room temperature were measured .The narrow violet band (peaking at 382 nm) and a broad green band (peaking at 507 nm) were observed in the PL spectrum . The intensity of luminescence depends on the excitation power density and the saturation effect of luminescence was also observed. But the variation and saturation value are different for these two luminescence peaks. It is shown in experiment that the violet peak of ZnO nanowires appear red-shift as excitation power density increases. The mechanism, which includes luminescence peaks appearance, saturation value, luminescence intensity variation, wavelength red-shift, have been analyzed.