Synthesis of Efficiently Green Luminescent CdSe/ZnS Nanocrystals Via Microfluidic Reaction
<p>Abstract</p><p>Quantum dots with emission in the spectral region from 525 to 535 nm are of special interest for their application in green LEDs and white-light generation, where CdSe/ZnS core-shell structured nanocrystals (NCs) are among promising candidates. In this study, trip...
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2008-01-01
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Series: | Nanoscale Research Letters |
Online Access: | http://dx.doi.org/10.1007/s11671-008-9125-5 |
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doaj-b2ec1f1d825f414da2f80cba3d59a8882020-11-25T01:05:34ZengSpringerOpenNanoscale Research Letters1931-75731556-276X2008-01-0134134139Synthesis of Efficiently Green Luminescent CdSe/ZnS Nanocrystals Via Microfluidic ReactionLuan WeilingYang HongweiFan NingningTu Shan-Tung<p>Abstract</p><p>Quantum dots with emission in the spectral region from 525 to 535 nm are of special interest for their application in green LEDs and white-light generation, where CdSe/ZnS core-shell structured nanocrystals (NCs) are among promising candidates. In this study, triple-ligand system (trioctylphosphine oxide–oleic acid–oleylamine) was designed to improve the stability of CdSe NCs during the early reaction stage. With the precisely controlled reaction temperature (285 °C) and residence time (10 s) by the recently introduced microfluidic reaction technology, green luminescent CdSe NCs (λ = 522 nm) exhibiting narrow FWHM of PL (30 nm) was reproducibly obtained. After that, CdSe/ZnS core-shell NCs were achieved with efficient luminescence in the pure green spectral region, which demonstrated high PL QY up to 70% and narrow PL FWHM as 30 nm. The strengthened mass and heat transfer in the microchannel allowed the formation of highly luminescent CdSe/ZnS NCs under low reaction temperature and short residence time (<it>T</it> = 120 °C,<it>t</it> = 10 s). The successful formation of ZnS layer was evidence of the substantial improvement of PL intensity, being further confirmed by XRD, HRTEM, and EDS study.</p>http://dx.doi.org/10.1007/s11671-008-9125-5 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Luan Weiling Yang Hongwei Fan Ningning Tu Shan-Tung |
spellingShingle |
Luan Weiling Yang Hongwei Fan Ningning Tu Shan-Tung Synthesis of Efficiently Green Luminescent CdSe/ZnS Nanocrystals Via Microfluidic Reaction Nanoscale Research Letters |
author_facet |
Luan Weiling Yang Hongwei Fan Ningning Tu Shan-Tung |
author_sort |
Luan Weiling |
title |
Synthesis of Efficiently Green Luminescent CdSe/ZnS Nanocrystals Via Microfluidic Reaction |
title_short |
Synthesis of Efficiently Green Luminescent CdSe/ZnS Nanocrystals Via Microfluidic Reaction |
title_full |
Synthesis of Efficiently Green Luminescent CdSe/ZnS Nanocrystals Via Microfluidic Reaction |
title_fullStr |
Synthesis of Efficiently Green Luminescent CdSe/ZnS Nanocrystals Via Microfluidic Reaction |
title_full_unstemmed |
Synthesis of Efficiently Green Luminescent CdSe/ZnS Nanocrystals Via Microfluidic Reaction |
title_sort |
synthesis of efficiently green luminescent cdse/zns nanocrystals via microfluidic reaction |
publisher |
SpringerOpen |
series |
Nanoscale Research Letters |
issn |
1931-7573 1556-276X |
publishDate |
2008-01-01 |
description |
<p>Abstract</p><p>Quantum dots with emission in the spectral region from 525 to 535 nm are of special interest for their application in green LEDs and white-light generation, where CdSe/ZnS core-shell structured nanocrystals (NCs) are among promising candidates. In this study, triple-ligand system (trioctylphosphine oxide–oleic acid–oleylamine) was designed to improve the stability of CdSe NCs during the early reaction stage. With the precisely controlled reaction temperature (285 °C) and residence time (10 s) by the recently introduced microfluidic reaction technology, green luminescent CdSe NCs (λ = 522 nm) exhibiting narrow FWHM of PL (30 nm) was reproducibly obtained. After that, CdSe/ZnS core-shell NCs were achieved with efficient luminescence in the pure green spectral region, which demonstrated high PL QY up to 70% and narrow PL FWHM as 30 nm. The strengthened mass and heat transfer in the microchannel allowed the formation of highly luminescent CdSe/ZnS NCs under low reaction temperature and short residence time (<it>T</it> = 120 °C,<it>t</it> = 10 s). The successful formation of ZnS layer was evidence of the substantial improvement of PL intensity, being further confirmed by XRD, HRTEM, and EDS study.</p> |
url |
http://dx.doi.org/10.1007/s11671-008-9125-5 |
work_keys_str_mv |
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