White light emitting silicon nanocrystals as nanophosphor

Abstract

We exploited the practical sonochemical route for preparing silicon nanocrystals at room temperature and ambient pressure. This synthesis provided the very fast reaction within a few hours and the useful modification for the surface of silicon nanoparticles. The average size of prepared nanocrystals was 2.8 nm and confirmed by TEM images. The chlorine-capped nanoparticles were characterized by FT-IR spectroscopy. The luminescence of silicon colloid was observed in the wide range between 340 nm and near 700 nm and showed white color with commercial low-intensity UV-lamp exposure. This synthetic strategy is potentially applicable for illuminating devices such as white light emitting diodes.

Size-Dependent Oxidation of Monodisperse Silicon Nanocrystals with Allylphenylsulfide Surfaces

“…Luminescent, colloidally stable silicon nanocrystals are a new class of materials with a wide range of applications from medical imaging to optoelectronics such as light emitting diodes (LEDs) and solar cells . In contrast to II–VI and III–V semiconductor nanocrystals, the advantage of silicon, the element that dominates the microelectronics and photovoltaic industry, is its nontoxicity, earth abundance and low cost.…”

Solution-processable white-light-emitting germanium nanocrystals

“…Although bluish-white light emissions have been commonly reported in many papers, but tuning the color of white light still remains difficult [28][29][30]. Our previous study used silicon nanoparticles as a model to demonstrate the successful separation of nanoparticles by emission color through conventional silica-gel column chromatography [31].…”

Review—Quantum Dots and Their Application in Lighting, Displays, and Biology

“…23 After an hour of sonication, the nanocrystals emit from 340 to 700 nm ( Figure 12). Neither quantum yield nor CIE coordinates were given for this experiment.…”