Nanodiamond Vacancy Defects and Quantum Dots for Luminescence
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Solution Overview
Problem
Existing luminescent nanodiamonds exhibit limited luminescence intensity, particularly at nano-scale sizes, limiting their applicability in applications requiring high visibility and sensitivity, such as biological imaging and sensing.
Innovation Solution
The formation of luminescent diamond through high-pressure high-temperature (HPHT) consolidation of diamond grains, combined with laser irradiation to create nitrogen vacancy centers and quantum dots, enhances luminescence intensity by incorporating both surface and internal luminescent centers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If nanodiamond particle size is reduced to enhance sensitivity in biological applications, then sensitivity and visibility improve, but luminescence intensity decreases
Solution Approach 1:
The patent introduces nitrogen vacancy centers and quantum dots as localized luminescent centers within the nanodiamond structure. These defect sites concentrate luminescence activity at specific locations, allowing small particles to maintain high luminescence intensity through enhanced local emission rather than relying on overall particle size
Solution Approach 2:
The patent modifies the internal structure of nanodiamonds by creating nitrogen vacancy centers and quantum dots through controlled treatment processes. These structural parameter changes enable the material to exhibit enhanced luminescence properties that overcome the natural size-dependent intensity reduction
2Ease of manufacture
If conventional luminescent nanodiamonds are used, then manufacturing simplicity is maintained, but luminescence intensity is limited
Solution Approach 1:
The patent incorporates nitrogen vacancy centers and quantum dots into the nanodiamond structure during or before the final formation process. This preliminary introduction of luminescent centers ensures high luminescence intensity is built into the material from the start, avoiding the need for complex post-manufacturing modifications
Solution Approach 2:
The patent creates a composite structure within the nanodiamond by combining the diamond matrix with nitrogen vacancy centers and quantum dots. This composite approach integrates multiple functional elements that work together to produce enhanced luminescence while maintaining the structural integrity and ease of production of diamond particles
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 enhanced luminescence intensity of the nanodiamonds allows for improved visibility and sensitivity in biological applications, expanding their utility to smaller particle sizes and other uses requiring high luminescence.
Implementation Method 1
luminescent diamond... that has been developed to emit light when excited by a light source
Implementation Method 2
laser irradiation to create nitrogen vacancy centers and quantum dots
Implementation Method 3
The formation of luminescent diamond through high-pressure high-temperature (HPHT) consolidation of diamond grains
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 or pressure transfer media to cause the grains to undergo plastic deformation to produce internal vacancy defects, increasing the luminescent activity/intensity of the resulting diamond material. The luminescent material is then subjected to further treatment to create quantum dots on the surface of the diamond particles. Quantum dot formation can include placing the diamond particles in liquid and subjecting the particles to laser pulses. The consolidated diamond material may be 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.