Abstract
Large quantities of silica nanowires were synthesized through thermal treatment of silicon wafer in the atmosphere of N(2)/H(2)(5%) under 1200 °C with Cu as catalyst. These nanowires grew to form a natural bright-white mat, which showed highly diffusive reflectivity over the UV-visible range, with more than 60% at the whole range and up to 88% at 350 nm. The utilization of silica nanowires in diffusive coating on the reflector cup of LED is demonstrated, which shows greatly improved light distribution comparing with the specular reflector cup. It is expected that these nanowires can be promising coating material for optoelectronic applications.
Highlights
One-dimensional (1-D) structures, such as nanowires, nanobelts and nanotubes, have intrigued considerable research enthusiasm for their unique properties and promising applications as building blocks in nanoscale electronics and optoelectronics, which is superior to their bulk counterparts [1,2]
Large quantities of silica nanowires were synthesized through thermal treatment of silicon wafer in the atmosphere of N2/H2(5%) under 1200 °C with Cu as catalyst
The utilization of silica nanowires in diffusive coating on the reflector cup of LED is demonstrated, which shows greatly improved light distribution comparing with the specular reflector cup
Summary
One-dimensional (1-D) structures, such as nanowires, nanobelts and nanotubes, have intrigued considerable research enthusiasm for their unique properties and promising applications as building blocks in nanoscale electronics and optoelectronics, which is superior to their bulk counterparts [1,2]. With the rapidly increasing demand for high-bright lighting sources, the energy-saving LEDs have attracted more and more attentions for both experiment and commercialization [8]. We introduced the novel idea of using silica nanowires as the optical coatings to the design and fabrication of high-bright LEDs and studied their influence on the lighting performance. We have successfully fabricated a large scale of silica nanowires via vapor-liquidsolid (VLS) mechanism with Cu as the catalyst These grown nanowires formed a brilliant white mat, which demonstrated high diffusive reflectivity at the UV-visible light range. They were applied in this work as diffusive coating material for the reflector cup of LED lamps, and the influence of nanowire coating on emitting intensity and uniformity was further explored
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