Phosphor-Converted LED Light Bead for Stable Red Brightness
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Solution Overview
Problem
Existing red light beads made from gallium arsenide are costly, power-limited, and experience significant brightness decrease with increasing temperature, limiting their performance in LED applications.
Innovation Solution
A new LED light bead design that emits red, orange, or yellow light by combining blue light with a phosphor layer, replacing traditional red light beads, and using blue light-emitting chips made from gallium nitride and sapphire to reduce costs and improve brightness stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If red light beads are made from gallium arsenide materials, then red light emission is achieved, but the cost increases and power is limited
Solution Approach 1:
The patent changes the material parameter from gallium arsenide to gallium nitride, and changes the light generation mechanism from direct red light emission to blue light excitation of red phosphor. This parameter change enables higher power operation while maintaining red light emission, resolving the contradiction between brightness and power limitations.
Solution Approach 2:
The patent introduces red phosphor as an intermediary substance that converts blue light from gallium nitride chips into red light. This intermediary approach allows the system to achieve higher power output from the blue chips while still producing the required red light, eliminating the power limitations of direct red LED materials.
2Illumination intensity
If red light beads are made from gallium arsenide materials, then red light emission is achieved, but the cost increases
Solution Approach 1:
The patent changes the material composition from expensive gallium arsenide to cheaper gallium nitride chips combined with red phosphor. Gallium nitride is more abundant and easier to manufacture than gallium arsenide, significantly reducing production costs while maintaining or improving brightness performance.
Solution Approach 2:
The patent replaces expensive gallium arsenide red light beads with a combination of cheaper gallium nitride chips and red phosphor. This substitution uses more economical materials that are easier to source and manufacture, reducing overall production costs while achieving the same or better performance.
3Illumination intensity
If temperature rises, then brightness of red light beads decreases significantly
Solution Approach 1:
The patent changes the light generation mechanism from direct red light emission (which is temperature-sensitive) to blue light excitation of red phosphor. The gallium nitride blue chips have better thermal stability, and the phosphor conversion process is less affected by temperature variations, resulting in more stable brightness output across different operating conditions.
Solution Approach 2:
The patent introduces red phosphor as a thermal buffer that decouples the temperature sensitivity of the light source from the final red light output. The phosphor layer absorbs blue light and converts it to red light through a process that is less sensitive to temperature changes, thereby stabilizing the brightness output even when operating temperature varies.
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 new LED light bead achieves higher power and reduced costs by eliminating material limitations, maintaining brightness across temperature variations, and providing equivalent color performance to traditional RGB LEDs.
Implementation Method 1
The second light-emitting chip or the third light-emitting chip is also provided with a first phosphor layer, so that the blue light emitted by the second light-emitting chip or the third light-emitting chip is transformed into the third color light after passing through the first phosphor layer
Data Source
AI summary
A new type of LED light, related to a technical field of LED, including a cup body. The cup body includes a first light-emitting assembly, a second light-emitting assembly and a third light-emitting assembly. The first light-emitting assembly is used to emit green light, the second light-emitting assembly is used to emit blue light, and the third light-emitting assembly is used to emit blue light. A first phosphor layer is provided on the second light-emitting assembly or the third light-emitting assembly, so that the blue light emitted by the second light-emitting assembly or the third light-emitting assembly is transformed into red light after passing through the first phosphor layer. The present disclosure emits red light through a combination of blue light and a phosphor layer, replacing traditional red lights, improving the performance of the new type of LED light and reducing costs.