Wavelength Conversion Member With Ceramic Particles For Heat Dissipation
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Solution Overview
Problem
High-power LEDs and LDs cause temperature rise in wavelength conversion members, leading to decreased luminescence intensity and potential melting of component materials due to heat and excitation light, resulting in temperature quenching and thermal defects.
Innovation Solution
A wavelength conversion member comprising 70-99.9% inorganic phosphor particles and 0.1-30% easily sinterable ceramic particles, where the ceramic particles interpose between the phosphor particles to enhance thermal conductivity and resistance, reducing temperature rise and preventing melting, along with a heat dissipation layer for efficient heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-power LEDs or LDs are used to increase light emitting power, then the power output is improved, but temperature rise occurs causing luminescence intensity decrease and potential melting of component materials
Solution Approach 1:
The patent introduces easily sinterable ceramic particles as intermediary materials between phosphor particles. These ceramic particles have high thermal conductivity and act as heat transfer mediators, conducting heat away from the phosphor particles to prevent temperature rise and luminescence intensity decrease, while enabling the use of high-power LEDs or LDs
Solution Approach 2:
The patent creates a composite wavelength conversion member consisting of phosphor particles dispersed in a glass matrix with easily sinterable ceramic particles. This composite structure combines the wavelength conversion capability of phosphors with the thermal management properties of ceramic particles, resolving the contradiction between high power output and temperature control
2Power
If high-power LEDs or LDs are used, then power output is improved, but luminescence intensity decreases with time due to temperature quenching
Solution Approach 1:
Easily sinterable ceramic particles serve as intermediary heat conduction paths between phosphor particles, continuously transferring heat away to maintain stable operating temperature and prevent temperature quenching, thereby ensuring long-term luminescence intensity stability with high-power light sources
Solution Approach 2:
The patent changes the thermal conductivity parameter of the wavelength conversion member by incorporating easily sinterable ceramic particles with high thermal conductivity. This parameter change enables efficient heat dissipation, preventing temperature quenching and maintaining stable luminescence intensity over time
3Power
If high-power LEDs or LDs are used, then power output is improved, but component materials may melt due to excessive temperature rise
Solution Approach 1:
Easily sinterable ceramic particles act as intermediary heat conduction pathways, intercepting and conducting heat away from phosphor particles before it can accumulate to melting temperatures. This prevents thermal damage to component materials while enabling high-power operation
Solution Approach 2:
The patent converts the harmful heat generated by high-power LEDs or LDs into a manageable thermal flow by introducing ceramic particles with high thermal conductivity. The heat is redirected through the ceramic particle network to the substrate, transforming a potentially damaging effect into a controlled thermal management solution
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 reduces luminescence intensity degradation and prevents material melting when exposed to high-power LEDs or LDs, maintaining performance and mechanical integrity by efficiently dissipating heat and enhancing thermal resistance.
Implementation Method 1
because the easily sinterable ceramic particles have high thermal conductivity compared to glass or the like, they can efficiently release heat generated in the inorganic phosphor particles to the outside
Implementation Method 2
a wavelength conversion member is disposed on an LED for emitting a blue light and absorbs part of the light from the LED to convert it to a yellow light
Data Source
AI summary
Provided are a wavelength conversion member and a wavelength conversion element which are capable of reducing the decrease in luminescence intensity with time and the melting of a component material when irradiated with light of a high-power LED or LD, and a light emitting apparatus using the wavelength conversion member or the wavelength conversion element. A wavelength conversion member contains, in % by mass, 70 to 99.9% inorganic phosphor particles and 0.1 to 30% easily sinterable ceramic particles, wherein the easily sinterable ceramic particles are interposed between the inorganic phosphor particles and the inorganic phosphor particles are bound together by the easily sinterable ceramic particles.