Transparent Thermally Conductive Layer for LED Heat Dissipation
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Solution Overview
Problem
High-power white LEDs face heat dissipation issues due to the phosphor layer overheating during light conversion, leading to decreased efficiency and lifespan, as existing designs fail to effectively dissipate heat away from the phosphor layer.
Innovation Solution
Incorporating a transparent thermally conductive layer with a phosphor layer, where the phosphor layer is thermally coupled to the conductive layer and a heat-sink structure, allowing for efficient heat dissipation through fins and a metal housing, preventing degradation and maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a phosphor layer is used to convert blue light to white light, then the light conversion efficiency is improved, but the phosphor layer overheats and degrades
Solution Approach 1:
The device is segmented into distinct functional layers: a light-emitting semiconductor layer, a transparent thermally conductive layer, and a phosphor layer. This segmentation allows each layer to perform its specific function while facilitating heat management by separating the light generation function from the light conversion function, enabling independent optimization of thermal pathways.
Solution Approach 2:
A transparent thermally conductive layer is introduced as an intermediary between the light-emitting semiconductor and the phosphor layer. This intermediary layer serves dual functions: it allows light to pass through for phosphor excitation while simultaneously conducting heat away from the phosphor layer, preventing overheating and degradation.
2Stability of the object's composition
If the phosphor layer is mounted further away from the light emitting semiconductor, then color consistency is improved, but heat dissipation is worsened
Solution Approach 1:
The transparent thermally conductive layer acts as an intermediary that bridges the gap between the light-emitting semiconductor and the phosphor layer. It maintains the necessary distance for color consistency while providing a thermal conduction pathway, thus solving both the optical and thermal requirements simultaneously.
Solution Approach 2:
The transparent thermally conductive layer performs multiple functions: it is optically transparent to allow light transmission for phosphor excitation, thermally conductive to dissipate heat from the phosphor layer, and structurally supportive to maintain layer separation. This multi-functionality resolves the contradiction between color consistency and heat dissipation.
3Illumination intensity
If high power is used for illumination, then luminance is improved, but phosphor layer degradation is accelerated
Solution Approach 1:
The patent converts the harmful heat generated by high-power phosphor operation into a beneficial thermal conduction pathway. The transparent thermally conductive layer captures the waste heat and directs it toward heat dissipation structures, transforming what would be a degradation-causing factor into a manageable thermal flow that maintains phosphor layer integrity even under high-power conditions.
Solution Approach 2:
The transparent thermally conductive layer serves as a protective intermediary that shields the phosphor layer from the harmful effects of self-generated heat during high-power operation. By providing a dedicated thermal conduction pathway, it enables sustained high-power illumination without accelerating phosphor degradation.
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 dissipates heat generated by the phosphor layer, preventing degradation and maintaining the efficiency and lifespan of high-power white LEDs, ensuring consistent color temperature and luminance.
Implementation Method 1
a transparent thermally conductive layer having a thermal conductivity greater than that of the at least one phosphor layer
Implementation Method 2
A light source that appears to be white and that has a conversion efficiency comparable to that of fluorescent light sources can be constructed from a blue light emitting semiconductor covered with a layer of phosphor that converts a portion of the blue light to yellow light
Data Source
AI summary
A light emitting device and method of producing the same is disclosed. The light emitting device includes a transparent thermally conductive layer, a phosphor layer provided on the transparent thermally conductive layer, and at least one light emitting semiconductor arranged to emit light toward the transparent thermally conductive layer and the phosphor layer.