Abstract

This paper discusses the optical properties of colloidal CdSe/CdTe, CdTe/CdSe, and CdTe/CdS heterostructures synthesized by growing a shell on CdSe and CdTe nanocrystals. The extinction coefficients of the first exciton absorption band and the extinction coefficients at 400 nm are determined as a function of the amount of shell material added during the growth of the heterostructures. It is shown that the resulting heterostructures have extinction coefficients 1–2 orders of magnitude greater than the initial cores: up to 0.3×10⁷cm⁻¹M⁻¹ in the case of CdTe/CdS and CdTe/CdSe and up to 1.6×10⁷cm⁻¹M⁻¹ in the case of CdSe/CdTe. It is shown that the luminescence wavelength in the 550–950-nm range can be controlled by varying the shell size for CdSe/CdTe heterostructures.

© 2011 OSA

Efficient carrier multiplication and extraction in aqueous-processed giant CdTe-CdS nanocrystal bulk heterostructures

Chen-Yu Xu, Yu-Han Lin, Lei Wang, Hai-Yu Wang, and Hong-Bo Sun
Opt. Mater. Express 12(6) 2240-2251 (2022)

Near-infrared single-photon emitters based on colloidal CdSe/CdS/ZnS nanocrystals and Nd(III) 1,3-diketonate

Mikhail Metlin, Sergey Ambrozevich, Vladislav Korshunov, Vladimir Fedyanin, Peter Tananaev, and Ilya Taydakov
Opt. Lett. 45(19) 5480-5483 (2020)

Laser-annealing-made amplified spontaneous emission of “giant” CdSe/CdS core/shell nanocrystals transferred from bulk-like shell to quantum-confined core

Chen Liao, Kai Fan, Ruilin Xu, Huichao Zhang, Changgui Lu, Yiping Cui, and Jiayu Zhang
Photon. Res. 3(5) 200-205 (2015)

Exciton states of II–VI tetrapod-shaped nanocrystals

Yuanzhao Yao, Takashi Kuroda, Dmitry N. Dirin, Anastasia A. Irkhina, Roman B. Vasiliev, and Kazuaki Sakoda
Opt. Mater. Express 3(7) 977-988 (2013)

Exciton states of CdTe tetrapod-shaped nanocrystals

Kazuaki Sakoda, Yuanzhao Yao, Takashi Kuroda, Dmitry N. Dirin, and Roman B. Vasiliev
Opt. Mater. Express 1(3) 379-390 (2011)