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- Title
Synthesis of Efficiently Green Luminescent CdSe/ZnS Nanocrystals Via Microfluidic Reaction.
- Authors
Weiling Luan; Hongwei Yang; Ningning Fan; Shan-Tung Tu
- Abstract
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 ( T = 120 °C, t = 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.
- Subjects
QUANTUM dots; SEMICONDUCTOR nanocrystals; QUANTUM electronics; LIGHT sources; NANOCRYSTALS; RECEPTOR-ligand complexes
- Publication
Nanoscale Research Letters, 2008, Vol 3, Issue 4, p134
- ISSN
1931-7573
- Publication type
Article
- DOI
10.1007/s11671-008-9125-5