Wavelength-Converted LED Structure for Higher Light Extraction
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Solution Overview
Problem
Current LED devices face limitations in light extraction efficiency, despite advancements in double- or multi-junction structures and improved heat dissipation methods.
Innovation Solution
The proposed LED device incorporates a first and second epitaxial layered structure emitting different wavelength ranges, a light conversion layer excited by the first wavelength to emit a third wavelength, and a bonding unit allowing the third wavelength to pass through, along with an electrically conductive structure for connection, enhancing luminance and light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If double- or multi-junction LED structures are used to improve light extraction efficiency, then light extraction efficiency is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The device divides the light emission function into separate components: a first epitaxial layered structure emits first wavelength light, a light conversion layer converts it to third wavelength light, and a second epitaxial layered structure emits second wavelength light. The bonding unit selectively transmits third wavelength light while blocking first wavelength light. This segmentation achieves multi-wavelength emission without complex multi-junction structures.
Solution Approach 2:
The bonding unit acts as an optical intermediary that selectively transmits third wavelength light generated by the light conversion layer while blocking first wavelength light from the first epitaxial layered structure. This intermediary component enables efficient wavelength management and light extraction without requiring complex multi-junction epitaxial structures.
2Temperature
If inverted LED mounting is used to improve heat dissipation, then heat dissipation is improved, but light extraction efficiency remains limited
Solution Approach 1:
The device adds a vertical layering dimension with multiple epitaxial structures at different heights. The second epitaxial layered structure is positioned at a higher level than the first, allowing its light to escape directly without being blocked by the first structure. This vertical arrangement improves both heat dissipation through the substrate and light extraction efficiency through multi-level emission paths.
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 significantly enhances the output light luminance and extraction efficiency of the LED device by mixing and filtering wavelengths, achieving improved performance without the need for complex double- or multiple-junction structures, thus reducing manufacturing costs.
Implementation Method 1
The light conversion layer is formed on the first region of the upper surface of the first epitaxial layered structure and is configured to be excited by light of the first wavelength range emitted from the first epitaxial layered structure to emit light of a third wavelength range different from the first wavelength range
Data Source
AI summary
A light-emitting diode (LED) device includes a first epitaxial layered structure having an upper surface having different first and second regions, a second epitaxial layered structure spaced-apart disposed on the first epitaxial layered structure, a light conversion layer formed on the first region, a bonding unit disposed on the light conversion layer, the bonding unit and the light conversion layer interconnecting the first and second epitaxial layered structures, and an electrically conductive structure formed on the second region and electrically connects the first and second epitaxial layered structures. A method for manufacturing the LED device is also disclosed.