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首页> 外文期刊>Polymers for advanced technologies >Regulating the Fluorescence Emission ofCdSeQuantum Dots Based on the Surface Ligand Exchange withMAA
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Regulating the Fluorescence Emission ofCdSeQuantum Dots Based on the Surface Ligand Exchange withMAA

机译：基于表面配体交换，调节CDSequantum点的荧光发射

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摘要

Cadmium selenide (CdSe) quantum dots (QDs) is a promising semiconductor and fluorescence nanocrystal with quantum size effect. To address the problem of fluorescence emission during the process of the ligand transformation of colloidal cluster CdSe QDs from nonpolar organic solvents to polar inorganic aqueous solutions, the surface ligand exchange with mercapto acetic acid (MAA) was proposed. It was attributed to the Cd-O bond breaking and the Cd-S bond formation. The intensity and wavelength of fluorescence emission spectra could be adjusted by controlling the concentration of MAA. The photoluminescence (PL) spectra and UV-Vis absorption spectra of colloidal cluster CdSe QDs indicated that the electronic properties of the interface varied with the exchange of the surface ligands. Moreover, the band-edge emission quenching occurred and the maximum redshift of the PL spectrum could reach 28 nm. The enhancement of the deep trap emission peaks of CdSe QDs appeared in 600-900 nm region, and the maximum blue shift of the defect peak in PL spectrum could reach 80 nm with the increase concentration of MAA. The absorption spectra and PL spectra on the surface of porous alumina thin film were used to further analyze the charge separation and capture of charge carriers. This novel organic-inorganic ligand exchange method provides an effective strategy for regulating fluorescence and electron transfer, which could be used on biological, solar cells or other practical applications.
机译：硒化镉（CdSe）量子点是一种具有量子尺寸效应的半导体和荧光纳米晶体。为了解决胶体簇CdSe量子点从非极性有机溶剂到极性无机水溶液的配体转化过程中的荧光发射问题，提出了巯基乙酸（MAA）表面配体交换的方法。这与Cd-O键断裂和Cd-S键形成有关。通过控制MAA的浓度可以调节荧光发射光谱的强度和波长。胶体簇CdSe量子点的光致发光（PL）光谱和紫外-可见吸收光谱表明，界面的电子性质随表面配体的交换而变化。此外，还发生了带边发射猝灭，PL光谱的最大红移可达28nm。CdSe量子点的深阱发射峰出现在600-900nm区域，随着MAA浓度的增加，荧光光谱中缺陷峰的最大蓝移可达80nm。利用多孔氧化铝薄膜表面的吸收光谱和光致发光光谱进一步分析了载流子的电荷分离和俘获。这种新型的有机-无机配体交换方法为调节荧光和电子转移提供了一种有效的策略，可用于生物、太阳能电池或其他实际应用。

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