The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 23, 2019
Filed:
Jul. 30, 2013
Dow Corning Corporation, Midland, MI (US);
James A. Casey, Merrill, MI (US);
Ludmil M. Zambov, Midland, MI (US);
DOW SILICONES CORPORATION, Midland, MI (US);
Abstract
A method of improving the photoluminescence of silicon nanoparticles is provided along with a description of the silicon nanoparticle compositions prepared therefrom. The method generally comprises exposing a composition comprising silicon nanoparticles having a mean particle diameter not greater than 5 nm and a fluid to a non-ambient condition selected from (i) elevated temperature, (ii) elevated humidity, (iii) elevated pressure exerted by an oxygen-containing gas, (iv) a hydrogen plasma, (v) hydrogen gas, (vi) ultraviolet radiation, and (vii) and a combination of at least two of (i)-(vi). Optionally, the silicon nanoparticles may be prepared by a gas phase reaction. The exposure of the silicon nanoparticle compositions to the non-ambient condition results in improved photoluminescence. In particular, the exposed nanoparticles exhibit increased maximum emission intensity and luminescent quantum efficiency. Moreover, these improvements are accompanied by a blue shift in the emitted light to a shorter wavelength.