Epoxy Resin Composition for LED Packaging

Resolve Bottlenecks,
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 achieve desired color temperatures and lighting effects.

Innovation Solution

An epoxy resin composition combining triazine derivative and silicon-containing alicyclic epoxy resins is used in a light emitting apparatus, enhancing reliability, optical properties, and heat resistance, which includes a light emitting chip, a body part, and a filling part, with the epoxy resins improving moisture-resistant and heat-resistant properties.

Engineering Contradictions & Design Principles

VSEngineering 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 correlated color temperature (CCT) is fixed and color rendering index (CRI) is low

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidCCT control range

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent segments the phosphor system into multiple phosphors (YAG:Ce phosphor and at least one additional phosphor with different emission characteristics) instead of using a single YAG:Ce phosphor. This segmentation allows independent optimization of each phosphor's properties and combination them to achieve both manufacturing feasibility and adjustable CCT/CRI performance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs a composite phosphor material system combining YAG:Ce phosphor with other phosphors (such as red phosphors, green phosphors, or orange phosphors) to create a multi-component phosphor blend. This composite approach enables tuning of optical properties including CCT and CRI while maintaining compatibility with blue LED excitation sources.

Inventive Principle:

Principle #40Composite materials

2Device complexity

If conventional YAG:Ce phosphor is used in white LED, then the LED structure is simple, but the color rendering index (CRI) is low (70-75)

Engineering Contradiction:

Improvephosphor system complexityVSAvoidcolor rendering quality

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent divides the phosphor conversion function across multiple phosphor materials, where YAG:Ce phosphor provides yellow emission and additional phosphors (red, green, or orange) supplement specific wavelength ranges. This segmentation enables comprehensive spectral coverage for improved color rendering while keeping each individual phosphor component relatively simple.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent utilizes phosphors with different emission colors (yellow from YAG:Ce, red from CaAlSiN3:Eu or similar, green from beta-SiAlON:Eu or similar, orange from Sr2Si5N8:Eu or similar) to create a composite phosphor system. By selecting and combining phosphors with complementary color emissions, the system achieves full-spectrum coverage and high CRI values.

Inventive Principle:

Principle #32Color changes

Data Source

PatentEP2669333B1Epoxy resin composition and light emitting apparatus

Publication Date: 2017.04.05 KUKDO CHEM CO LTD

AI summary

Disclosed are an epoxy resin composition and a light emitting apparatus. The epoxy resin composition includes a triazine derivative epoxy resin and a silicon-containing alicyclic epoxy resin.