Epoxy Resin Composition for LED Packages
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional white LEDs using YAG:Ce phosphor have fixed correlated color temperature (CCT) and low color rendering index (CRI), making it difficult to control and adjust color temperature and rendering, which limits their suitability for various lighting applications.
Innovation Solution
An epoxy resin composition combining triazine derivative and alicyclic epoxy resins is used in the light emitting apparatus, providing improved reliability, optical properties, and heat-resistant properties, which can be applied to the body or filling parts of LED packages, thereby enhancing the performance of white LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional YAG:Ce phosphor is used in white LED, then the LED can be manufactured with simple binary system, but the CCT is fixed and CRI is low (70-75)
Solution Approach 1:
The patent divides the single phosphor system into multiple phosphor components (YAG:Ce phosphor and red phosphor) to achieve segmented color control. This allows independent optimization of yellow light emission (high efficiency) and red light emission (color rendering), resolving the contradiction between manufacturing simplicity and color control versatility.
Solution Approach 2:
The patent uses a composite phosphor system combining YAG:Ce phosphor (yellow) and red phosphor materials. This composite approach maintains the simplicity of the binary LED-phosphor structure while adding color rendering capability through the red phosphor component, achieving both ease of manufacture and adaptability in CCT/CRI control.
2Device complexity
If only YAG:Ce phosphor is used, then the LED structure remains simple, but it is difficult to control CCT, CRI and color temperature
Solution Approach 1:
The patent applies local quality by assigning specific functional roles to different phosphor materials: YAG:Ce phosphor provides high-efficiency yellow light emission, while red phosphor provides long-wavelength emission for color rendering. This localized functional assignment enables independent control of color parameters without increasing overall system complexity.
Solution Approach 2:
The patent changes the spectral parameters by introducing red phosphor with specific emission characteristics (610-780nm). This parameter change in the phosphor composition enables adjustment of CCT and CRI while maintaining relatively simple device structure, as the red phosphor can be integrated into the existing LED package.
3Ease of manufacture
If conventional epoxy resin is used in LED package, then the manufacturing process is simple, but the moisture-resistant and heat-resistant properties are insufficient
Solution Approach 1:
The patent uses a composite epoxy resin system consisting of multiple components (epoxy resin, curing agent, and additional functional additives). This composite resin formulation maintains ease of manufacturing through standard encapsulation processes while significantly improving moisture resistance and heat resistance properties compared to conventional single-component epoxies.
Data Source
Figure 1
AI summary
Disclosed are an epoxy resin composition and a light emitting apparatus. The epoxy resin composition includes a triazine derivative epoxy resin and an alicyclic epoxy resin.