Synthesis and applications of crack-free SiO2 monolith containing CdSe/ZnS quantum dots as passive lighting sources.
A reverse microemulsion technique has been used to synthesize quantum dot nanocomposites within a SiO2 surface coating. With this approach, the unique optical properties of the CdSe/ZnS quantum dots were preserved. CdSe/ZnS/SiO2 nanoparticles were homogeneously distributed in a tetramethyl orthosilicate ethanol solution and gelation process was initiated within a 10 min, and was left over night at room temperature and dried fully to achieve a solid SiO, monolith. The resulting monolith was transparent and fluorescent under ultraviolet (UV) lamp. Moreover the monolith produced was crack-free. Further studies on the photo stability of the monolith were performed using a high power UV LED device. Remarkably, quantum dots in the SiO, monolith showed better photo stability compared with those dispersed in a polymer matrix.
Yi
Dong Kee
DK
Gachon Bionano Research Institute, Department of BioNano Technology, Kyungwon University, Sung Nam city, Bokjung san 65, South Korea.
D019187:Cadmium Compounds / Q000737:chemistry*; D008027:Light; D046911:Macromolecular Substances / Q000737:chemistry; D008968:Molecular Conformation; D053761:Nanocomposites; D036103:Nanotechnology / Q000379:methods; D010777:Photochemistry / Q000379:methods; D011108:Polymers / Q000737:chemistry; D045663:Quantum Dots; D018036:Selenium Compounds / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013440:Sulfides / Q000737:chemistry*; D013499:Surface Properties; D013997:Time Factors; D014466:Ultraviolet Rays; D017967:Zinc Compounds / Q000737:chemistry*
D019187:Cadmium Compounds; D046911:Macromolecular Substances; D011108:Polymers; D018036:Selenium Compounds; D013440:Sulfides; D017967:Zinc Compounds; D012822:Silicon Dioxide; C058667:cadmium selenide; C031238:zinc sulfide