Research Article

The Large-Scale Synthesis of Vinyl-Functionalized Silicon Quantum Dot and Its Application in Miniemulsion Polymerization

Figure 3

Optical properties of SiQD@PS nanoparticles prepared using KOH/OA = 2. (a) Photoluminescence spectra (PL) obtained at different excitation wavelengths and photoluminescence excitation (PLE) spectrum conducted at 400 nm. (b) Photostability of SiQD@PS nanoparticles in comparison with V-Si QDs. Inset: picture of SiQD@PS nanoparticles dispersed in water (upper layer) after two hours of excitation with an UV lamp. (c) pH stability of photoluminescence. The PL spectra were conducted with an excitation wavelength of 320 nm. pH was varied with KOH or HCl 1 M solutions. Inset: variation of PL intensity at 386 nm with pH. (d) Normalized PL spectra obtained with an excitation wavelength at 320 or 640 nm showing two-photon luminescence property of SiQD@PS NPs.