Lateral surface passivation of CdSe nanoplatelets through crown management

Liu，Huan1,2; Chen，Peixian3; Zhang，Xuanyu2; Wang，Xiongbin2; He，Tingchao3; Chen，Rui2

2023-08-10

10.1039/d3nr03133k

Nanoscale   Impact Factor & Quartile

2040-3364

2040-3372

Two-dimensional colloidal CdSe nanoplatelets (NPLs) have been considered as ideal emitting materials for high performance light-emitting devices due to their excellent optical properties. However, the understanding of defect related radiative and nonradiative recombination centers in CdSe NPLs is still far from sufficient, especially their physical distribution locations. In this work, CdSe core and CdSe/CdS core/crown NPLs have been successfully synthesized and their optical properties have been characterized by laser spectroscopies. It is found that the photoluminescence quantum yield of CdSe NPLs is improved by a factor of 4 after the growth of the CdS crown. At low temperatures, the change in the ratio of low and high energy emission intensities from NPLs suggests that the radiative recombination centers are mainly located on the lateral surface of the samples. This finding is further confirmed by the surface passivation experiment. Meanwhile, the nonradiative recombination centers of NPLs located on the lateral surface are also confirmed by ligand exchange. These results demonstrate the importance of understanding the optical properties of the lateral surface of NPLs, which are important for the design of material structures for optoelectronic applications.

SCI

English

Corresponding

National Natural Science Foundation of China[62174079] ; Science, Technology and Innovation Commission of Shenzhen Municipality["JCYJ20220530113015035","JCYJ20210324120204011","JCYJ20190808121211510","KQTD2015071710313656"]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:001048316400001

ROYAL SOC CHEMISTRY

2-s2.0-85169503378

Scopus

1.Harbin Institute of Technology,Harbin,150001,China
2.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen,518060,China

Liu，Huan,Chen，Peixian,Zhang，Xuanyu,et al. Lateral surface passivation of CdSe nanoplatelets through crown management[J]. Nanoscale,2023,15(34):14140-14145.

Liu，Huan,Chen，Peixian,Zhang，Xuanyu,Wang，Xiongbin,He，Tingchao,&Chen，Rui.(2023).Lateral surface passivation of CdSe nanoplatelets through crown management.Nanoscale,15(34),14140-14145.

Liu，Huan,et al."Lateral surface passivation of CdSe nanoplatelets through crown management".Nanoscale 15.34(2023):14140-14145.