LED Package Composite Particles Prevent Wavelength Conversion Subsidence

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Solution Overview

Problem

In light-emitting diode package structures, wavelength conversion powder particles tend to subside due to gravitational force, resulting in concentration gradients and inconsistent color temperature, which complicates precise control of the light-emitting diode package's color output.

Innovation Solution

The use of composite particles formed by bonding wavelength conversion powder particles with shell-like second powder particles, which have a lower equivalent density, to prevent subsidence within the matrix material, ensuring uniform distribution and consistent light emission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If wavelength conversion powder particles are used in the package material, then wavelength conversion function is achieved, but powder particles subside due to gravitational force causing concentration gradient

Engineering Contradiction:

Improvewavelength conversion functionVSAvoiduniform distribution of powder particles

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent uses composite particles consisting of wavelength conversion powder particles bonded with shell-like second powder particles. This composite structure combines materials with different densities to create particles that have reduced overall density and improved suspension stability in the package material, preventing subsidence while maintaining wavelength conversion functionality.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the density parameter of the powder particles by bonding them with shell-like particles of lower density. This parameter modification allows the composite particles to achieve better distribution uniformity in the package material without subsiding under gravitational force.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If powder particles are used for wavelength conversion, then color conversion is achieved, but color temperature control precision deteriorates due to subsidence

Engineering Contradiction:

Improvecolor conversion functionVSAvoidcolor temperature control

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

By creating composite particles with shell-like structures, the patent achieves uniform distribution of wavelength conversion material throughout the package material. This uniform distribution ensures consistent color temperature across the LED package, improving manufacturing precision for color temperature control.

Inventive Principle:

Principle #40Composite materials

3Ease of manufacture

If simple powder particles are used, then easy processing is achieved, but subsidence occurs due to density difference with matrix material

Engineering Contradiction:

Improveprocessing simplicityVSAvoidresistance to subsidence

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The patent creates composite particles by bonding wavelength conversion powder with shell-like particles. This composite approach maintains ease of manufacture through simple mixing and bonding processes while effectively preventing subsidence through the density-balancing shell structure.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the density parameter of the wavelength conversion particles by combining them with lower-density shell materials. This parameter change enables the particles to match the density of the matrix material more closely, preventing subsidence while maintaining manufacturing simplicity.

Inventive Principle:

Principle #35Parameter changes

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

This approach ensures that the light-emitting diode package structure achieves consistent light colors and improved light extraction efficiency by uniformly distributing the wavelength conversion material, reducing the occurrence of subsidence and concentration gradients.

Implementation Method 1

the wavelength conversion material of the powder particles is subsided in the colloid material due to gravitational force

Methodology Applied

Scientific EffectGravitational force: Gravitation

Implementation Method 2

Each second powder particle has a shell-like structure... prevent subsidence within the matrix material

Methodology Applied

Scientific EffectBuoyancy: Archimedes' Principle (Buoyancy)

Implementation Method 3

Each first powder particle is a wavelength conversion material... the wavelength conversion material used in the light-emitting diode package structure

Methodology Applied

Scientific EffectWavelength conversion: Photoluminescence

Data Source

PatentUS9231168B2Light emitting diode package structure

Publication Date: 2016.01.05 IND TECH RES INST

AI summary

A light-emitting diode package structure including a chip carrier portion, a light-emitting diode chip, and a package material is provided. The light-emitting diode chip is disposed on the chip carrier portion of the package. The package material is filled in the chip carrier portion and covers the light-emitting diode chip. The package material includes a matrix material, a plurality of first powder particles, and a plurality of second powder particles. The first powder particles and the second powder particles are distributed in the matrix material. Each first powder particle is a wavelength conversion material. Each second powder particle has a shell-like structure.