Sintered Wavelength Conversion Member for LED Heat Dissipation
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Solution Overview
Problem
Existing light-emitting devices face challenges in heat dissipation, leading to decreased luminescence intensity and potential defects due to increased output from excitation light sources, particularly in wavelength conversion members where heat dissipation is inadequate beyond the joint surface with heat dissipating members.
Innovation Solution
A wavelength conversion member with a high relative density of 90% or more, thermal conductivity of 10 W/m·K or more, and quantum efficiency of 50% or more, incorporating inorganic phosphors like YAG, LuAG, and SiAlON within a matrix of materials such as aluminum oxide or magnesium oxide, forming a sintered body to enhance heat dissipation and maintain luminescence intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the output of excitation light sources is increased to increase light intensity, then the light intensity of light-emitting devices is improved, but temperature rise of wavelength conversion members occurs causing decreased luminescence intensity and material defects
Solution Approach 1:
The patent changes the thermal conductivity parameter of the wavelength conversion member from conventional low values to 10 W/m·K or more, and adjusts the relative density to 90% or more. These parameter changes enable the material to dissipate heat effectively while maintaining high light intensity output, resolving the contradiction between increased illumination and temperature rise.
Solution Approach 2:
The patent employs composite material structures combining wavelength conversion materials with high thermal conductivity substrates or heat dissipation layers. This composite approach allows the wavelength conversion member to convert light efficiently while the composite structure provides enhanced heat dissipation pathways, preventing temperature-related luminescence degradation and material defects.
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 increases heat dissipation capabilities, reducing the decrease in luminescence intensity caused by increased excitation light source output and minimizing temperature-related defects in wavelength conversion members.
Implementation Method 1
a wavelength conversion member is disposed on an LED capable of emitting a blue light and absorbs part of the blue light to convert it to a yellow light
Implementation Method 2
the thermal conductivity of the wavelength conversion member itself is 10 W/m·K or more... it has high heat dissipation capability
Data Source
AI summary
Provided are a wavelength conversion member, a light-emitting element, and a light-emitting device which have high heat dissipation capability and are capable of reducing the decrease in luminescence intensity caused by increased output of an excitation light source. A wavelength conversion member 10 includes a matrix 2 and an inorganic phosphor 1 contained in the matrix 2 and has a relative density of 90% or more, a thermal conductivity of 10 W/m·K or more, and a quantum efficiency of 50% or more.