Ionic Liquid Resin for Semiconductor Nanoparticle Phosphor Protection
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Solution Overview
Problem
Semiconductor nanoparticle phosphors in light emitting devices are prone to deterioration due to external air, moisture, and heat, leading to efficiency decreases, as existing protection methods like silica shells can cause efficiency losses during the coating process and heat conduction from the light source.
Innovation Solution
Incorporating semiconductor nanoparticle phosphors into a resin formed by polymerization of an ionic liquid with a polymerizable functional group, which acts as a protective medium, preventing deterioration by sealing the phosphors and allowing for integral or separate formation with the light source, thereby reducing heat conduction and maintaining high emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If semiconductor nanoparticle phosphors are dispersed in resin without protection, then device structure is simple, but phosphor efficiency decreases due to air and moisture influences
Solution Approach 1:
The patent uses an ionic liquid-based resin that creates a protective environment around semiconductor nanoparticle phosphors, isolating them from harmful external factors such as air and moisture. This inert environment maintains phosphor efficiency without requiring complex multi-layer protective structures.
Solution Approach 2:
The patent employs a composite resin system combining ionic liquid components with polymerizable functional groups. This composite material provides both protective properties against environmental degradation and structural integrity, resolving the contradiction between simplicity and reliability.
2Reliability
If silica shell is used to protect semiconductor nanoparticle phosphors, then phosphor protection against air and moisture is improved, but phosphor efficiency decreases during coating process
Solution Approach 1:
The patent changes the material parameter from traditional silica shell to ionic liquid-based resin, which provides comparable protective properties without causing efficiency loss during the coating process. The ionic liquid resin maintains phosphor luminescence characteristics while providing environmental protection.
Solution Approach 2:
The ionic liquid-based resin forms a flexible protective matrix around phosphors, allowing for effective protection without the rigidity and processing issues associated with silica shells. This flexible film approach maintains phosphor efficiency while providing reliable protection.
3Volume of moving object
If wavelength converter is disposed adjacently to light source, then device structure is compact, but heat conduction deteriorates phosphor performance
Solution Approach 1:
The patent employs the ionic liquid-based resin as a protective medium that can be easily applied and cured, providing thermal isolation without requiring complex heat management structures. This approach maintains device compactness while protecting phosphors from heat-induced deterioration.
Solution Approach 2:
The ionic liquid resin creates a thermally isolating environment between the light source and wavelength converter, protecting phosphors from heat conduction while maintaining compact device structure. This inert thermal environment preserves phosphor performance despite close proximity to the light source.
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 use of ionic liquid-based resin effectively protects semiconductor nanoparticle phosphors from air, moisture, and heat, maintaining high light emission efficiency and enabling space-saving, easy light distribution control, and high heat radiation capabilities in light emitting devices.
Implementation Method 1
a resin formed by polymerization of an ionic liquid including a polymerizable functional group
Implementation Method 2
a semiconductor nanoparticle phosphor... emits fluorescence upon receiving excitation light
Data Source
AI summary
A light emitting device includes a light source and a wavelength converter that includes a resin including a constitutional unit that includes an ionic liquid or a derivative of the ionic liquid, and a semiconductor nanoparticle phosphor included in the resin and provided on at least a portion of the light source. A wavelength converter includes a resin including a constitutional unit that includes an ionic liquid or a derivative of the ionic liquid, and a semiconductor nanoparticle phosphor included in the resin and emitting fluorescence upon receiving excitation light. A light emitting device includes the wavelength converter and a light source emitting excitation light to the wavelength converter, which is provided separately from the wavelength converter.