Luminescent diamond
AssigneeSchlumberger Technology Corporation
InventorsYahua Bao, J. Daniel Belnap
Life of this patent
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Abstract
Luminescent diamond is made by subjecting a volume of diamond grains to high-pressure/high-temperature conditions with or without a catalyst or pressure transfer media to cause the grains to undergo plastic deformation to produce nitrogen vacancy defects, increasing the luminescent activity/intensity of the resulting diamond material. The consolidated diamond material may be further treated to further increase luminescent activity/intensity including reducing the consolidated diamond material to diamond particles, heat treatment in vacuum, and/or air heat treatment. The resulting luminescent diamond particles display a level of luminescence intensity greater than that of conventional luminescent nanodiamond, and may be functionalized for use in biological applications.
Claims25
A luminescent diamond material comprising diamond particles that are mechanically interlocked together and combined with a pressure transfer media, wherein the luminescent diamond material is made by high-pressure/high-temperature process, wherein the diamond particles include diamond grains that have undergone plastic deformation, and wherein the luminescent diamond material displays a level of luminescence intensity in one or combinations of blue, violet-blue, red, or green wavelength spectrums that is greater than that of a precursor diamond material used to form the luminescent diamond material.
A method for making luminescent diamond comprising subjecting a volume of precursor diamond grains in the presence of a pressure transfer media to a high-pressure/high-temperature condition at an elevated temperature greater than about 900° C. to cause the diamond grains to undergo plastic deformation to produce nitrogen vacancy defects in the diamond grains, wherein the resulting diamond material displays a level of luminescence intensity in one or combinations of violet-blue, blue, red, and green wavelength spectrums that is greater than that of the precursor diamond grains, and wherein the resulting diamond material is free of intercrystalline bonded diamond.
Dependencies are inferred from the claim text.