Enhanced Emission from Bright Excitons in Asymmetrically Strained Colloidal CdSe/CdxZn1–xSe Quantum Dots
| العنوان: | Enhanced Emission from Bright Excitons in Asymmetrically Strained Colloidal CdSe/CdxZn1–xSe Quantum Dots |
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| المؤلفون: | Igor Fedin, Sergei Tretiak, Dan Liu, Scott A. Crooker, Mateusz Goryca, Victor I. Klimov |
| المصدر: | ACS Nano. 15:14444-14452 |
| بيانات النشر: | American Chemical Society (ACS), 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Materials science, Photoluminescence, Photon, Condensed Matter::Other, Phonon, Exciton, General Engineering, Physics::Optics, General Physics and Astronomy, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Molecular physics, Spectral line, Condensed Matter::Materials Science, Quantum dot, General Materials Science, Spontaneous emission, Spectroscopy |
| الوصف: | 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. |
| تدمد: | 1936-086X 1936-0851 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::28a1300448ab6b2303943461fb5542e5 https://doi.org/10.1021/acsnano.1c03864 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........28a1300448ab6b2303943461fb5542e5 |
| قاعدة البيانات: | OpenAIRE |
Find this issue from the American Chemical Society | تدمد: | 1936086X 19360851 |
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