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首页> 外文期刊>ACS applied materials & interfaces >Effect of Lateral Size and Surface Passivation on the Near-Band-Edge Excitonic Emission from Quasi-Two-Dimensional CdSe Nanoplatelets
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Effect of Lateral Size and Surface Passivation on the Near-Band-Edge Excitonic Emission from Quasi-Two-Dimensional CdSe Nanoplatelets

机译：横向尺寸和表面钝化对近二维CDSE纳米孔近边缘探康发射的影响

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摘要

As a new type of quasi-two-dimensional nanomaterial, CdSe nanoplatelets (NPLs) possess excellent properties such as narrow emission peak, large absorption cross section, and a low threshold of amplified spontaneous emission. However, the origin of emission especially at low temperatures has not been studied clearly up till now. Here, we study the temperature-dependent photoluminescence of CdSe NPLs which show two emission peaks at low temperatures. It is interesting to note that the intensity of the low-energy peak shows a correlation with laser irradiation time. Moreover, the low-temperature PL spectra of four CdSe NPLs with different lateral sizes demonstrate the relationship of low-energy peaks with the surface. It has been confirmed that CdSe NPLs with larger surface areas to volume ratio have stronger low-energy emissions, which is ascribed to the surface-state-related emission. Finally, surface passivation of CdSe NPLs attenuates the intensity of the low-energy peak, which further verifies our model. Our results demonstrate the critical significance of surface in CdSe NPLs for their optical properties, which is crucial for the application of optoelectronic devices.
机译：作为一种新型的准二维纳米材料，CDSE纳米片（NPLS）具有优异的性质，例如窄的发射峰，大吸收横截面和低扩增的自发发射的低阈值。然而，尤其是在低温下的发射起源尚未清楚地研究到目前为止。在这里，我们研究了在低温下显示出两个发射峰的CDSE NPLS的温度依赖性光致发光。值得注意的是，低能量峰的强度显示与激光照射时间的相关性。此外，具有不同横向尺寸的四个CDSE NPLS的低温PL光谱证明了低能量峰与表面的关系。已经证实，具有较大表面积的CDSE NPLS对体积比具有较强的低能量排放，其归因于与表面相关的发射。最后，CDSE NPLS的表面钝化衰减低能量峰的强度，进一步验证了我们的模型。我们的结果表明了表面CDSE NPLS的致力显着性，对于它们的光学性质至关重要，这对于应用光电器件至关重要。

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