Cavity Layer Light Emitting Device Resonance
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Solution Overview
Problem
Conventional light emitting devices, such as LEDs, face challenges in achieving improved luminous efficiency and color reproducibility, particularly in generating uniform white light with enhanced color purity.
Innovation Solution
The proposed light emitting device incorporates a light emitting chip with a first and second cavity layer of different refractive indices, each resonating specific colors of light, and half mirror layers to optimize light reflection and resonance, allowing for the generation of secondary and tertiary lights that combine to form white light with improved luminous efficiency and color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional LED structures are used, then the device is simple and easy to manufacture, but the luminous efficiency and color reproducibility are insufficient
Solution Approach 1:
The device is divided into multiple functional layers including first and second cavity layers with different refractive indices, multiple half mirror layers, and phosphor layers. Each layer performs a specific function in light generation, resonance, and color conversion, allowing optimization of luminous efficiency while maintaining manufacturability through modular structure
Solution Approach 2:
The patent employs nested cavity structures where the first cavity layer and second cavity layer are positioned sequentially above the light emitting chip, with each cavity layer containing phosphor materials. This nested arrangement allows multiple light resonance and color conversion processes to occur within a compact vertical structure, improving luminous efficiency without significantly increasing device footprint
2Ease of manufacture
If conventional LED structures are used, then the device is simple, but the color purity and color reproducibility are poor
Solution Approach 1:
Different phosphor materials are placed in different cavity layers with specific refractive indices. The first cavity layer contains phosphor for generating second light, while the second cavity layer contains phosphor for generating third light. This local differentiation of material properties enables precise control over color output and improves color reproducibility
Solution Approach 2:
The patent utilizes cavity layers with different refractive indices (first refractive index for first cavity layer, second refractive index for second cavity layer) to control light resonance conditions. By adjusting optical parameters such as refractive index and cavity thickness, the device achieves improved color purity and reproducibility while maintaining a manufacturable structure
3Loss of energy
If multiple cavity layers with different refractive indices are added, then luminous efficiency and color reproducibility improve, but device complexity increases
Solution Approach 1:
The patent combines light resonance and color conversion functions into integrated cavity layers. Each cavity layer simultaneously serves as a resonator for specific wavelengths and as a host for phosphor materials, merging multiple functions into unified structures to reduce overall device complexity while maintaining improved luminous efficiency
Solution Approach 2:
The cavity layers serve multiple functions: they act as resonators for light amplification, as hosts for phosphor materials, and as optical waveguides. This multi-functionality reduces the need for separate components, thereby improving luminous efficiency without proportionally increasing device complexity
4Manufacturing precision
If multiple cavity layers with different refractive indices are added, then color purity improves, but device complexity increases
Solution Approach 1:
The patent achieves color differentiation by adding vertical layering (z-dimension) rather than expanding horizontal complexity. Multiple cavity layers are stacked vertically above the light emitting chip, each contributing to different color components. This vertical arrangement improves color reproducibility while maintaining a compact footprint and manageable structural complexity
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 configuration enhances the luminous efficiency and color reproducibility of the light emitting device by amplifying and resonating lights of different wavelengths, resulting in improved color purity and uniform white light emission.
Implementation Method 1
the first cavity layer resonates the second light
Implementation Method 2
the first half mirror layer reflects at least a portion of the second light; the second half mirror layer reflects at least a portion of the third light
Implementation Method 3
the second cavity layer resonates the third light
Implementation Method 4
the second half mirror layer reflects at least a portion of the third light
Implementation Method 5
a first phosphor dispersed in the first base material and which generates the second light by absorbing at least a portion of the first light; a second phosphor dispersed in the second base material and which generates the third light by absorbing at least a portion of the first light and the second light
Data Source
AI summary
A light emitting device includes a light emitting chip which generates a first light having a first color, a first cavity layer disposed on the light emitting chip and which generates a second light having a second color and has a first refractive index, a second cavity layer disposed on the first cavity layer and which generates a third light having a third color and has a second refractive index, a first half mirror layer disposed between the first cavity layer and the light emitting chip and which reflects at least a portion of the second light, a second half mirror layer disposed between the first cavity layer and the second cavity layer and which reflects at least a portion of the third light, and a third half mirror layer disposed on the second cavity layer and which transmits the first light.