光致发光
量子点
激子
材料科学
光谱学
光子
自发辐射
谱线
发射光谱
分子物理学
胶体
放松(心理学)
硒化镉
光电子学
原子物理学
物理
凝聚态物理
化学
光学
激光器
量子力学
社会心理学
天文
物理化学
心理学
作者
Igor Fedin,M. Goryca,Dan Liú,Sergei Tretiak,Victor I. Klimov,S. A. Crooker
出处
期刊:ACS Nano
[American Chemical Society]
日期:2021-09-02
卷期号:15 (9): 14444-14452
被引量:7
标识
DOI:10.1021/acsnano.1c03864
摘要
Colloidal CdSe quantum dots (QDs) designed with a high degree of asymmetric internal strain have recently been shown to host a number of desirable optical properties including subthermal room-temperature line widths, suppressed spectral diffusion, and high photoluminescence (PL) quantum yields. It remains an open question, however, whether they are well-suited for applications requiring emission of identical single photons. Here we measure the low-temperature PL dynamics and the polarization-resolved fluorescence line narrowing spectra from ensembles of these strained QDs. Our spectroscopy reveals the radiative recombination rates of bright and dark excitons, the relaxation rate between the two, and the energy spectra of the quantized acoustic phonons in the QDs that can contribute to relaxation processes. In comparison to conventional colloidal CdSe/ZnS core/shell QDs, we find that in asymmetrically strained CdSe QDs over six times more light is emitted directly by the bright exciton. These results are therefore encouraging for the prospects of chemically synthesized colloidal QDs as emitters of single indistinguishable photons.
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