Journal
RSC ADVANCES
Volume 2, Issue 24, Pages 9005-9010Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ra20950k
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Funding
- National Natural Science Foundation of China [21076103, 21176122]
- National Natural Science Foundation of China-NSAF [10976012]
- Natural Science Foundations for Jiangsu Higher Education Institutions of China [09KJB530005]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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We report an available route for the synthesis of poly(methacrylic acid) (PMAA) macromonomers/N-acetyl-L-cysteine (NAC)-co-capped CdTe quantum dots (QDs) toward multicolor fluorescent patterns and warm white LED devices. The properties of the as-prepared CdTe QDs herein were thoroughly investigated by Fourier transform infrared spectra (FT-IR), ultraviolet-visible (UV-vis), photoluminescence (PL), X-ray diffraction (XRD) and transmission electron microscopy (TEM) measurements. We have found that the PMAA/NAC-capped CdTe QDs exhibited stable and strong photoluminescence (PL) with a narrow size distribution and a high quantum yield (QY) of similar to 45%. Moreover, the as-prepared CdTe QDs demonstrated a quick growth rate and favorable fluorescent stability without any aggregation and phase separation when they were blended with a polymer matrix. Subsequently, by virtue of their excellent polymer-compatibility, we extended the water-soluble PMAA/NAC-capped CdTe QDs as fluorescent ink for multicolor fluorescent patterns by silk screen printing, which may find application in the anti-counterfeit field. In addition, we explored the robust CdTe QDs as red phosphor to fabricate a white LED device, the resulted LED emitted a higher rendering color index (CRI) warm white light compared to the conventional phosphor-only LEDs. It is believed that the route reported here could offer an available pathway to achieve robust QDs for diverse applications.
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