HPHT Luminescent Diamond Processing for Nitrogen-Vacancy Emission
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Solution Overview
Problem
Current methods for producing luminescent nanodiamond are expensive and energy-intensive, limiting its availability and affordability for various applications.
Innovation Solution
A high-pressure/high-temperature (HPHT) process is used to subject diamond grains to plastic deformation, creating nitrogen vacancy defects and increasing luminescent activity, followed by sizing and optional heat treatments to enhance luminescence intensity, resulting in a more efficient and affordable luminescent diamond.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to produce luminescent nanodiamond, then luminescent diamond can be obtained, but the production process is expensive and energy-intensive
Solution Approach 1:
The patent applies parameter changes by optimizing the HPHT processing conditions including temperature (1300-2200°C), pressure (5-10 GPa), and treatment duration to achieve high luminescence intensity while reducing energy consumption. The method also involves changing the physical state of diamond grains through plastic deformation to create nitrogen vacancy defects that enhance luminescence
Solution Approach 2:
The patent employs preliminary action by pre-treating diamond grains with HPHT processing before final sizing and application. This preliminary treatment creates the necessary nitrogen vacancy defects and luminescent centers in advance, so that the final product requires minimal additional processing to achieve the desired luminescence intensity
2Reliability
If conventional methods are used to produce luminescent nanodiamond, then luminescent diamond can be obtained, but production costs are high
Solution Approach 1:
The patent reduces production cost through parameter changes by optimizing HPHT processing to achieve high luminescence intensity with fewer processing steps. The method changes the manufacturing approach from multi-step conventional processes to a streamlined HPHT-based process that combines grain consolidation, defect creation, and luminescence enhancement in a single treatment
Solution Approach 2:
The patent applies self-service by using the diamond grains themselves as the starting material that undergoes transformation through HPHT processing. The process leverages the inherent properties of diamond grains and uses pressure and temperature to self-organize the material into a luminescent structure without requiring additional complex processing steps or materials
3Illumination intensity
If diamond grains are subjected to HPHT process to increase luminescence intensity, then luminescence intensity increases, but the process requires high pressure and temperature
Solution Approach 1:
The patent uses parameter changes to achieve high luminescence intensity by optimizing the combination of temperature and pressure parameters in the HPHT process. The method identifies specific temperature ranges (1300-2200°C) and pressure ranges (5-10 GPa) that efficiently create nitrogen vacancy defects while minimizing energy waste and material degradation
4Illumination intensity
If diamond grains are subjected to HPHT process to increase luminescence intensity, then luminescence intensity increases, but the process requires high pressure
Solution Approach 1:
The patent applies parameter changes by optimizing the pressure parameter in the HPHT process to achieve high luminescence intensity with reduced pressure requirements. The method identifies pressure ranges (5-10 GPa) that are sufficient to create the necessary plastic deformation and nitrogen vacancy defects without requiring excessively high pressures that would increase equipment complexity and operating costs
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting luminescent diamond exhibits luminescence intensity at least 2-10 times greater than conventional methods, expanding its applicability and reducing production costs.
Implementation Method 1
subjecting a volume of precursor diamond grains to a high-pressure/high-temperature condition to cause the grains to undergo plastic deformation to produce nitrogen vacancy defects in the diamond grains
Implementation Method 2
increases the luminescent activity and intensity of the resulting diamond material
Implementation Method 3
another method to increase the luminescence activity is to repeat the HPHT process on diamond material previously HPHT treated, such as heat treatment in an air or inert atmosphere, heat treatment in an oxygen atmosphere
Implementation Method 4
The diamond material formed by the high-pressure/high-temperature process is subjected to a reduction or sizing process to form diamond particles having a desired particle size
Data Source
AI summary
Luminescent diamond is made by subjecting a volume of diamond grains to high-pressure/high-temperature conditions with or without a catalyst to cause the grains to undergo plastic deformation to produce nitrogen vacancy defects in the diamond grains, increasing the luminescent activity/intensity of the resulting diamond material. The consolidated diamond material may be further treated to further increase luminescent activity/intensity, which treatment may comprise reducing the consolidated diamond material to diamond particles, heat treatment in vacuum, and air heat treatment, which reducing process further increases luminescent activity/intensity. 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.