LED Lighting Apparatus with Dual Fluorescent Layers
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Solution Overview
Problem
Current LED devices face challenges in heat efficiency, color rendering index, and overall light output, particularly in converting blue light to white light effectively, with undesired consumption of green light energy affecting the color rendering index.
Innovation Solution
The LED device design incorporates a first fluorescent layer between the second fluorescent layer and the LED module, utilizing different phosphor material ratios and thicknesses to optimize red and green light conversion, with the first fluorescent layer closer to the LED module for improved heat dissipation and light output, and a package housing that positions the fluorescent layers for enhanced stability and optical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the second fluorescent layer is placed closer to the LED module for better heat dissipation, then heat efficiency is improved, but green light is consumed by the first fluorescent layer reducing color rendering index
Solution Approach 1:
The patent divides the fluorescent conversion function into two separate layers: a first fluorescent layer containing red phosphor and a second fluorescent layer containing green phosphor. This segmentation allows independent optimization of each layer's position and composition, enabling the second layer to be placed closer to the LED module for heat dissipation while the first layer converts remaining blue light to red light without consuming green light energy.
Solution Approach 2:
The patent introduces a layered spatial arrangement where fluorescent materials are distributed in different positions along the light path. By placing the green phosphor layer closer to the LED module and the red phosphor layer farther away, the system optimizes both thermal management and optical performance in different spatial dimensions.
2Productivity
If phosphor material volume ratio is increased to improve light conversion, then luminous efficacy is improved, but device complexity increases
Solution Approach 1:
The patent optimizes luminous efficacy by adjusting the volume ratio of phosphor materials in each fluorescent layer. The first fluorescent layer contains red phosphor at a first volume ratio to first silicone material, while the second fluorescent layer contains green phosphor at a second volume ratio to second silicone material. These parameter optimizations enable high luminous efficacy without requiring complex multi-component phosphor formulations.
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 design enhances green light output, reduces unwanted green light consumption, and improves the color rendering index and luminous efficacy by optimizing the placement and composition of phosphor materials within the fluorescent layers, while also providing better heat dissipation and optical directionality.
Implementation Method 1
The first fluorescent layer has a first side facing to the LED module for converting the blue light to a red light
Implementation Method 2
The second fluorescent layer has a first side attached to a second side of the first fluorescent layer for converting the blue light to a red light emitted from a second side of the second fluorescent layer
Data Source
AI summary
A LED device includes LED chips mounted on a substrate, a first fluorescent layer, a second fluorescent layer and a package housing. The LED chips emit a blue light. The first fluorescent layer has a first side facing to the LED chips for converting the blue light to a red light. The second fluorescent layer has a first side attached to a second side of the first fluorescent layer for converting the blue light to a red light emitted from a second side of the second fluorescent layer. The package housing holds the substrate and the first fluorescent layer.