期刊
ACS NANO
卷 13, 期 5, 页码 5326-5334出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b09794
关键词
nanoplatelets; ligands; strain; photoluminescence; halides
类别
资金
- Region Ile-de-France
- French state funds [ANR-11-IDEX-0004-02]
- ERC [756225]
- European Research Council (ERC) [756225] Funding Source: European Research Council (ERC)
Zinc blende II-VI semiconductor nano-platelets (NPLs) are defined at the atomic scale along the thickness of the nanoparticle and are initially capped with carboxylates on the top and bottom [001] facets. These ligands are exchanged on CdSe NPLs with halides that act as X-L-type ligands. These CdSe NPLs are costabilized by amines to provide colloidal stability in nonpolar solvents. The hydrogen from the amine can participate in a hydrogen bond with the lone pair electrons of surface halides. After ligand exchange, the optical features are red-shifted. Thus, ligand tuning is another way, in addition to improved surface passivation leads to an increase in the fluorescence quantum efficiency of up to 70% in bromide. However, for chloride and iodide, the surface coverage is incomplete, and thus, the fluorescence quantum efficiency is lower. This ligand exchange is associated with a decrease in stress that leads to unfolding of the NPLs, which is particularly noticeable for iodide-capped NPLs.
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