Ionic Liquid Matrix for Semiconductor Nanoparticle Phosphor Stability
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Solution Overview
Problem
Conventional methods for stabilizing semiconductor nanoparticle phosphors, such as those used in LED applications, face issues with agglomeration and degradation due to the use of resins like epoxy and silicone, leading to impaired optical characteristics and photooxidation.
Innovation Solution
A phosphor containing particle is developed using a matrix derived from an ionic liquid with a polymerizable functional group, which disperses semiconductor nanoparticles and prevents agglomeration, maintaining high optical characteristics and stability against moisture and oxygen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If semiconductor nanoparticle phosphor is directly blended with sealing material such as silicone and acrylate, then the semiconductor nanoparticle phosphor can be sealed and protected, but the semiconductor nanoparticle phosphor agglomerates resulting in impaired optical characteristic and photooxidation occurs reducing quantum yield
Solution Approach 1:
The patent introduces an ionic liquid as an intermediary substance between the semiconductor nanoparticle phosphor and the sealing material. The ionic liquid forms a protective interface that prevents direct contact between the phosphor and harmful sealing materials, thereby preventing agglomeration and photooxidation while still allowing the sealing material to provide protective enclosure.
Solution Approach 2:
The patent creates a composite structure consisting of semiconductor nanoparticle phosphor dispersed in an ionic liquid matrix, which is then encapsulated by sealing material. This composite approach allows the ionic liquid to provide chemical compatibility and stability for the phosphor, while the sealing material provides mechanical protection and environmental barrier.
2Ease of manufacture
If conventional resins such as epoxy, silicone and (meth)acrylate are used as primary matrix material, then the semiconductor nanoparticle phosphor can be held in matrix structure, but the semiconductor nanoparticle phosphor agglomerates and has impaired optical characteristic
Solution Approach 1:
The patent changes the chemical parameters of the matrix material from conventional resins (epoxy, silicone, (meth)acrylate) to an ionic liquid. This parameter change fundamentally alters the interaction between the matrix and semiconductor nanoparticle phosphor, preventing agglomeration while maintaining the matrix's ability to hold and support the phosphor particles.
Solution Approach 2:
The ionic liquid creates a chemically inert environment for the semiconductor nanoparticle phosphor, similar to how an inert gas atmosphere prevents oxidation. The ionic liquid's unique properties provide a stable, non-reactive medium that prevents unwanted chemical interactions and maintains the phosphor's optical characteristics.
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 solution provides semiconductor nanoparticle phosphors with enhanced light emission efficiency and chemical stability, allowing for the production of high-performance light emitting devices and sheets with improved handleability.
Implementation Method 1
a matrix including a constitutional unit derived from an ionic liquid, the semiconductor nanoparticle phosphor being dispersed in the matrix
Implementation Method 2
a matrix including a constitutional unit derived from an ionic liquid including a polymerizable functional group
Implementation Method 3
the semiconductor nanoparticle phosphor emits light having a wavelength which is shorter as the semiconductor nanoparticle phosphor is reduced in dimension
Implementation Method 4
a semiconductor nanoparticle phosphor (also referred to as a quantum dot) reduced in size to approximately an exciton Bohr-radius presents a quantum size effect
Implementation Method 5
after the semiconductor nanoparticle phosphor is sealed, oxygen passes through the sealing material and moves to a surface of the semiconductor nanoparticle phosphor, and thus causes photooxidation
Data Source
AI summary
A phosphor containing particle includes a semiconductor nanoparticle phosphor and a matrix including a constitutional unit derived from an ionic liquid, the semiconductor nanoparticle phosphor being dispersed in the matrix. A light emitting device comprises a light source and a wavelength converter in which the phosphor containing particle of the present invention is dispersed in a translucent medium. A phosphor containing sheet in which the phosphor containing particle of the present invention is dispersed in a sheet-like translucent medium.