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Photoluminescence f...
Photoluminescence from quasi-type-II spherical CdSe-CdS core-shell quantum dots
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- Dong, Lin (författare)
- KTH,Optik
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- Sugunan, Abhilash (författare)
- KTH,Funktionella material, FNM
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- Hu, Jun (författare)
- KTH,Optik
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- Zhou, Sicheng (författare)
- KTH,Optik
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- Li, Shanghua (författare)
- KTH,Funktionella material, FNM
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- Popov, Sergei (författare)
- KTH,Optik
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- Toprak, Muhammet S. (författare)
- KTH,Funktionella material, FNM
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- Friberg, Ari T. (författare)
- KTH,Optik
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- Muhammed, Mamoun (författare)
- KTH,Funktionella material, FNM
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(creator_code:org_t)
- 2013
- 2013
- Engelska.
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Ingår i: Applied Optics. - 1559-128X .- 2155-3165. ; 52:1, s. 105-109
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Nyckelord
- 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
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- ref (ämneskategori)
- art (ämneskategori)
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