Ionic Liquid Resin Coated Semiconductor Nanoparticle Phosphor
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Solution Overview
Problem
Semiconductor nanoparticle phosphors experience impaired light emission characteristics and agglomeration when exposed to moisture, heat, or ultraviolet rays, and when incorporated in silicone resin sealing layers, leading to degraded optical properties.
Innovation Solution
A phosphor containing particle design featuring a core of resin with dispersed semiconductor nanoparticles coated by a shell of resin derived from ionic liquids, which provides protection without high-temperature processing, maintaining high light emission efficiency and chemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If atomic layer deposition (ALD) is used to coat primary particles, then chemical stability is improved, but light emission efficiency deteriorates due to high reaction temperature
Solution Approach 1:
The patent changes the temperature parameter from high (100-400°C in ALD) to low (room temperature or mild heating), enabling coating without thermal damage to semiconductor nanoparticles while still achieving chemical stability through the polymer shell formation
Solution Approach 2:
The patent replaces the thermal field-based ALD process with a chemical field-based polymerization process, where monomers polymerize on particle surfaces through chemical reactions rather than thermal deposition, eliminating the need for high temperature while achieving protective coating
2Ease of manufacture
If semiconductor nanoparticle phosphor is directly incorporated in sealing layer, then manufacturing simplicity is improved, but optical characteristics deteriorate due to agglomeration
Solution Approach 1:
The patent segments the semiconductor nanoparticles by coating each with a polymer shell, creating individually protected particles that resist agglomeration while maintaining ease of incorporation into sealing layers through the same simple mixing process
3Ease of operation
If semiconductor nanoparticle phosphor is exposed to moisture and heat, then handling simplicity is improved, but light emission characteristics deteriorate
Solution Approach 1:
The patent applies beforehand cushioning by forming a protective polymer shell around semiconductor nanoparticles before they are exposed to harsh environments, enabling simple handling while preventing moisture and heat from degrading light emission 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 effectively prevents agglomeration and degradation of semiconductor nanoparticles, ensuring high optical characteristics and chemical stability, allowing for the production of particles suitable for use in light emitting devices and sheets with improved handleability and performance.
Implementation Method 1
Semiconductor nanoparticle phosphor, also referred to as a quantum dot, is of commercial interest for an electronic characteristic size-tuneable by the quantum size effect
Data Source
AI summary
A phosphor containing particle including a core portion which is a particulate matter of resin including a constitutional unit derived from an ionic liquid with a semiconductor nanoparticle phosphor dispersed therein and a shell portion which is a matter in a form of a layer of resin which includes a constitutional unit derived from an ionic liquid and coats at least a portion of the core portion, and a phosphor containing particle including a particulate matter of resin including a constitutional unit derived from an ionic liquid with a semiconductor nanoparticle phosphor dispersed therein and a metal oxide layer coating at least a portion of the particulate matter of resin. A light emitting device including a light source and a wavelength converter in which phosphor containing particles are dispersed in a translucent medium, and a phosphor containing sheet in which phosphor containing particles are dispersed in a sheet-shaped translucent medium.