Spectroscopic studies of chiral perovskite nanocrystals

He, Tingchao1,2; Li, Junzi1,2; Li, Xingrong1,2; Ren, Can1,2; Luo, Yu1,2; Zhao, Fenghuan3; Chen, Rui3; Lin, Xiaodong1,2; Zhang, Junmin1,2

2017-10-09

10.1063/1.5001151

APPLIED PHYSICS LETTERS   影响因子和分区

0003-6951

1077-3118

As an emerging type of optically active material, semiconductor nanocrystals (NCs) stabilized by chiral molecules have attracted much attention. Owing to the wide range of potential applications of chiral perovskite NCs, the development of these materials is of great importance, but there has been a lack of relevant studies. Here, we describe an investigation of the properties of chiral perovskite NCs obtained using post-synthetic ligand exchange (achiral ligand/chiral ligand). These are found to exhibit mirror-image circular dichroism spectra. It is the chirality of the ligand (enantiomeric 1,2-diaminocyclohexane, DACH) that is most likely responsible for the induction of chiroptical activity in these NCs. Furthermore, their chiroptical properties and the corresponding mechanisms are found to depend strongly on the amount of capping ligand. When excess DACH is used to cap the surface of the NCs, their chiroptical properties are induced mainly by aggregation of DACH on the surface in a chiral pattern. In contrast, when small amounts of DACH are used for the capping, it is mainly surface distortion (or defects) and electronic interaction mechanisms that contribute to the chiroptical behavior of the NCs. In both cases, the anisotropy factors of the NCs are of the order of 10(-3), which is comparable to or larger than the values reported for other chiral semiconductor and metal NCs. This work opens the door toward further understanding of chiroptical perovskite NCs and their potential applications. Published by AIP Publishing.

SCI ; EI

英语

NI期刊

其他

Shenzhen Basic Research Project of Science and Technology[JCYJ2015032414171163] ; Shenzhen Basic Research Project of Science and Technology[JCYJ20150324141711581]

Physics

Physics, Applied

WOS:000413196100002

AMER INST PHYSICS

20174304286689

Dichroism ; Ligands ; Nanocrystals ; Perovskite ; Spectroscopic analysis ; Surface defects

Minerals:482.2 ; Light/Optics:741.1 ; Nanotechnology:761 ; Chemistry:801 ; Physical Chemistry:801.4 ; Materials Science:951

PHYSICS

Web of Science

1.Shenzhen Univ, Coll Phys & Energy, Shenzhen 518060, Peoples R China
2.Shenzhen Univ, Coll Chem & Environm Engn, Shenzhen 518060, Peoples R China
3.South Univ Sci & Technol China, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China

He, Tingchao,Li, Junzi,Li, Xingrong,et al. Spectroscopic studies of chiral perovskite nanocrystals[J]. APPLIED PHYSICS LETTERS,2017,111(15).

He, Tingchao.,Li, Junzi.,Li, Xingrong.,Ren, Can.,Luo, Yu.,...&Zhang, Junmin.(2017).Spectroscopic studies of chiral perovskite nanocrystals.APPLIED PHYSICS LETTERS,111(15).

He, Tingchao,et al."Spectroscopic studies of chiral perovskite nanocrystals".APPLIED PHYSICS LETTERS 111.15(2017).