US 12,421,120 B2
Nanodiamond with vacancy defect and quantum dot luminescence
J. Daniel Belnap, Provo, UT (US)
Assigned to Schlumberger Technology Corporation, Sugar Land, TX (US)
Appl. No. 18/851,223
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed Jun. 15, 2023, PCT No. PCT/US2023/068502
§ 371(c)(1), (2) Date Sep. 26, 2024,
PCT Pub. No. WO2023/245111, PCT Pub. Date Dec. 21, 2023.
Claims priority of provisional application 63/366,434, filed on Jun. 15, 2022.
Prior Publication US 2025/0162877 A1, May 22, 2025
Int. Cl. C01B 32/28 (2017.01); B01J 3/06 (2006.01); C09K 11/65 (2006.01)
CPC C01B 32/28 (2017.08) [B01J 3/065 (2013.01); C09K 11/65 (2013.01); B01J 2203/0655 (2013.01); C01P 2006/60 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for making luminescent diamond comprising:
subjecting a volume of precursor diamond grains in a presence of a pressure transfer media to a high-pressure/high-temperature condition at an elevated temperature greater than 900° C., and thereby causing the precursor diamond grains to undergo plastic deformation to produce internal vacancy defects in the precursor diamond grains to form a diamond slug; and
subjecting a surface of the diamond slug to laser pulses and thereby forming quantum dots on the surface of the diamond slug, wherein the laser pulses are femtosecond laser pulses, and wherein a carbon source for the quantum dots includes the diamond slug,
wherein the diamond slug including the quantum dots on the surface displays a level of luminescence intensity in one or combinations of visible, ultraviolet, infrared, or near-infrared spectrums that is greater than that of the precursor diamond grains.