Abstract
Zinc sulfide (ZnS) quantum dots (QDs) were encapsulated in ultraviolet (UV)-curable sealant upon the UV irradiation of the 365 nm. The QDs-sealant films were characterized with scanning electron microscopy (SEM), UV-visible spectroscopy and photoluminescence (PL) spectroscopy. Based on SEM analysis, the QDs encapsulated in UV-cured sealant clearly exhibited the formation of different size aggregates with a strong chemical bondage between the QDs and sealant. Optical absorption spectra showed strong red-shift for the QDs encapsulated in the UV sealant due to the aggregates of the QD nanoparticles. Room-temperature PL spectra have demonstrated that the pure QDs showed green emission at 517 nm while QDs-sealant film gave off cyan-blue PL with a strong and broad peak at 485 nm. Our results have demonstrated that the PL efficiency of QDs encapsulated in UV sealant matrix is higher than that of the QDs or UV sealant due to passivation of surfaces.
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