Surface-Modified Luminophores for LED Moisture Resistance
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Solution Overview
Problem
Luminophores based on alkaline earth metal silicates and fluoride compounds have low radiation stability and high sensitivity to water and air humidity, which limits their operational lifetime in LED applications, and existing protection methods like encapsulation or coating may not provide sufficient moisture resistance without compromising brightness or color quality.
Innovation Solution
Surface-modified luminophores with fluorinated inorganic or organic agents, including finely dispersed fluorides or fluorine compounds, are used to create hydrophobic surfaces and form moisture barrier layers, enhancing stability and reducing sensitivity to environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If luminophores based on alkaline earth metal silicates and fluoride compounds are used, then high quantum efficiency and radiation yield are achieved, but radiation stability is low and sensitivity to water and air humidity is high
Solution Approach 1:
A silane coupling agent is introduced as an intermediary substance between the luminophore particles and the encapsulating resin. The coupling agent forms a protective interface layer that improves adhesion and provides barrier properties against moisture and humidity, thereby enhancing radiation stability and reliability without compromising quantum efficiency
Solution Approach 2:
The patent creates a composite material system consisting of luminophore particles coated with silane coupling agent and embedded in an encapsulating resin. This composite structure combines the high quantum efficiency of the luminophore with the protective properties of the silane-resin matrix, achieving both high performance and improved radiation stability
2Reliability
If encapsulation or coating methods are used to protect luminophores, then moisture resistance is improved, but brightness and color quality are compromised
Solution Approach 1:
The silane coupling agent is applied locally to the surface of individual luminophore particles rather than forming a thick encapsulating layer around the entire LED assembly. This localized surface treatment provides moisture protection at the particle level while maintaining optimal light extraction and preserving brightness and color quality
Solution Approach 2:
The patent optimizes the concentration and molecular structure parameters of the silane coupling agent to achieve the right balance between protection and light transmission. By controlling the thickness and composition of the silane layer, the patent maintains high light extraction efficiency while providing sufficient moisture barrier properties
3Reliability
If surface modification with fluorinated agents is applied, then moisture resistance and radiation stability are improved, but manufacturing complexity increases
Solution Approach 1:
The silane coupling agent is pre-applied to the luminophore particles during the manufacturing process before the final encapsulation step. This preliminary surface treatment ensures that the protective layer is already in place on all particles, simplifying subsequent handling and encapsulation operations while maintaining high moisture resistance
Solution Approach 2:
The silane coupling agent exhibits self-assembling properties that allow it to automatically form a uniform protective layer on the luminophore particle surfaces through hydrolysis and condensation reactions. This self-organizing behavior reduces the need for complex coating equipment and precise process control, thereby lowering manufacturing complexity
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 surface-modified luminophores exhibit improved radiation stability and moisture resistance, leading to extended operational lifetime and maintained brightness and color quality in LED applications.
Implementation Method 1
Surface-modified luminophores with fluorinated inorganic or organic agents, including finely dispersed fluorides or fluorine compounds, are used to create hydrophobic surfaces and form moisture barrier layers
Implementation Method 2
fluorine compounds fixed to the luminophore
Implementation Method 3
luminophores configured to absorb light emitted from the light emitting diode and emit light having a different wavelength from the absorbed light
Implementation Method 4
absorb light emitted from the first light emitting diode and configured to emit light having a different wavelength from the absorbed light
Data Source
AI summary
A light emitting device including a housing, a plurality of heat-sinks adjoined to the housing and insulated from each other, a bottom surface of the heat-sinks being exposed to the outside, a light emitting diode mounted on at least one of the heat-sinks via a conductive adhesive, and a molding member encapsulating the light emitting diode and including thermosetting resin, in which a fluoride luminophore including I and IV group elements with fluorine and other luminophore are dispersed in the molding member, and the luminophores are configured to absorb at least a portion of light emitted from the light emitting diode and emit light having a wavelength different from that of the absorbed light.