Quantum Dot Particle With Plasmonic Layer For High Yield
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Solution Overview
Problem
Quantum dots face challenges in maintaining high fluorescence emission intensity over time due to loss of excitation light energy when passing through mediums, leading to reduced fluorescence quantum yield, especially in applications like cell analysis where high excitation energy is damaging.
Innovation Solution
A quantum dot particle structure incorporating a quantum dot core, a first protective layer, and a second protective layer with dispersed hybrid nanoparticles that generate a near-field plasmon effect under excitation light, enhancing excitation energy absorption without increasing the excitation light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If excitation light energy is increased to improve fluorescence quantum yield, then fluorescence emission intensity is improved, but damage to cell structure and biological macromolecules increases
Solution Approach 1:
The patent introduces a plasmonics layer as an intermediary component between the excitation light source and the quantum dot core. This layer acts as a mediator that concentrates and enhances the excitation energy locally through localized surface plasmon resonance, allowing the quantum dot to receive sufficient excitation energy for high fluorescence quantum yield without requiring high-intensity excitation light that would damage biological samples.
Solution Approach 2:
The patent changes the optical parameters of the system by introducing a plasmonics layer with specific optical properties (high refractive index, plasmon resonance characteristics). This parameter change enables efficient energy transfer and field enhancement, improving the fluorescence quantum yield under low excitation energy conditions while avoiding damage to cell structures.
2Use of energy by moving object
If excitation light intensity is increased to compensate for energy loss in medium, then fluorescence emission is improved, but the same damage to biological macromolecules occurs
Solution Approach 1:
The plasmonics layer serves as an intermediary that efficiently transfers excitation energy to the quantum dot core through localized surface plasmon resonance. This mediator enables high excitation energy absorption by the quantum dot without requiring high-intensity excitation light, thereby avoiding damage to biological macromolecules while maintaining effective fluorescence emission.
Solution Approach 2:
The patent creates a composite structure consisting of the quantum dot core, protective layers, and plasmonics layer. This composite material system combines the fluorescent properties of quantum dots with the plasmonic field-enhancement properties of the plasmonics layer, achieving efficient energy absorption and conversion while operating at low excitation intensities that are safe for biological applications.
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 quantum dot particle achieves higher fluorescence quantum yield by increasing excitation energy absorption through the near-field plasmon effect, reducing damage to cells and improving luminous efficiency in applications like cell imaging.
Implementation Method 1
the hybrid nanoparticle is configured to generate a near-field plasmon effect under irradiation of a excitation light
Implementation Method 2
quantum dots are important fluorescent nanomaterial. By virtues of wide absorption spectrum, narrow emission spectrum, high quantum yield
Implementation Method 3
The optical modifier emits light when a light emitted by the quantum dot core is irradiated on the optical modifier
Data Source
AI summary
The invention provides a quantum dot particle and a preparation method thereof. The quantum dot particle includes at least one quantum dot core, a first protective layer covering the quantum dot core, and a second protective layer covering the first protective layer, wherein at least one hybrid nanoparticle is dispersed in the second protective layer, and the hybrid nanoparticle is configured to generate a near-field plasmon effect under irradiation of excitation light. The quantum dot particle has a higher fluorescence quantum yield. The invention also provides a photoluminescence device containing the quantum dot particle.