光诱导电子掺杂下氧化锌纳米晶体的光学特性

Sekika Yamamoto, Tenta Ushida
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引用次数: 0

摘要

在室温下分步光掺杂过程中,测量了分散在乙醇中的负向光掺杂氧化锌纳米晶体的吸收光谱和光致发光(PL)光谱。几乎同时测量了每个光掺杂水平的光谱,并进行了详细比较,以讨论光谱变化的起源。在光掺杂的早期阶段,可以清楚地观察到 PL 光谱的红移及其强度的增加,这归因于三离子发光。对于高度光掺杂的纳米晶体,PL 光谱会分裂成两个峰值。我们从与纳米晶体尺寸的关系角度讨论了分裂的原因。
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Optical properties of ZnO nanocrystals under photo-induced electron doping
The absorption and photoluminescence (PL) spectra of negatively photodoped ZnO nanocrystals dispersed in ethanol are measured under a stepwise photodoping process at room temperature. The spectra are measured almost simultaneously at each photodoping level and compared in detail to discuss the origin of the spectral change. The redshift of the PL spectrum and the increase of its intensity are clearly observed in the early stage of photodoping and are attributed to the trion luminescence. The PL spectrum is found to split into two peaks for highly photodoped nanocrystals. The cause of the splitting is discussed in terms of its dependence on the nanocrystal size.
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