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Photoluminescence f...
Photoluminescence from quasi-type-II spherical CdSe-CdS core-shell quantum dots
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- Dong, Lin (author)
- KTH,Optik
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- Sugunan, Abhilash (author)
- KTH,Funktionella material, FNM
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- Hu, Jun (author)
- KTH,Optik
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- Zhou, Sicheng (author)
- KTH,Optik
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- Li, Shanghua (author)
- KTH,Funktionella material, FNM
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- Popov, Sergei (author)
- KTH,Optik
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- Toprak, Muhammet S. (author)
- KTH,Funktionella material, FNM
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- Friberg, Ari T. (author)
- KTH,Optik
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- Muhammed, Mamoun (author)
- KTH,Funktionella material, FNM
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(creator_code:org_t)
- 2013
- 2013
- English.
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In: Applied Optics. - 1559-128X .- 2155-3165. ; 52:1, s. 105-109
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Spherical CdSe-CdS core-shell quantum dots (QDs) are found to be flexible in the transition between the type-I regime and the type-II regime with different core/shell dimensions. The quasi-type-II feature of the colloidal dots is confirmed with time-resolved photoluminescence (PL) measurements. Two recombination paths of the excitons with significantly different decay rates are observed and analyzed. The spherical CdSe-CdS core-shell QDs are numerically simulated to investigate the carrier separation. A relatively long radiative lifetime and high degree of spatial carrier separation provide good potential to achieve lasing under continuous-wave excitation. Amplified spontaneous emission at room temperature is detected from the QDs embedded in the polymer matrix. It is shown that a larger shell thickness results in a lower pumping threshold, while a smaller shell thickness leads to higher PL efficiency.
Keyword
- Amplified spontaneous emissions
- Carrier separation
- Colloidal dots
- Continuous waves
- Core-shell quantum dots
- Core/shell
- Decay rate
- PL efficiency
- Pumping threshold
- Radiative lifetime
- Room temperature
- Shell thickness
- Time-resolved photoluminescence
Publication and Content Type
- ref (subject category)
- art (subject category)
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