Epitaxial Full-Color LED Structure Without Phosphor Conversion
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Solution Overview
Problem
Existing light emitting diodes (LEDs) are large in size, high in cost, and have short lifetimes and poor reliability due to the use of phosphors or quantum dots for wavelength conversion.
Innovation Solution
A light emitting device with a semiconductor layer featuring protrusions and recessed regions, where the light emitting layer is composed of different regions covering the protrusions and recessed areas, allowing for different wavelengths without the need for phosphors or quantum dots, achieved through epitaxial growth and varying doping efficiencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If phosphors or quantum dots are used for wavelength conversion in LED, then full-color light emission is achieved, but device lifetime and reliability deteriorate
Solution Approach 1:
The patent extracts and eliminates the phosphor or quantum dot wavelength conversion layer from the LED structure. Instead of using a blue LED chip with phosphor coating, the invention directly grows red, green, and blue light-emitting regions in the semiconductor layer through epitaxial growth, removing the unreliable wavelength conversion component while maintaining full-color emission capability
Solution Approach 2:
The patent applies local quality by creating spatially distinct light-emitting regions with different compositions within the semiconductor layer. The red, green, and blue emitting regions are localized at different positions (top surface, side walls, and recessed regions respectively), with each region having tailored material composition to emit specific wavelengths, eliminating the need for phosphor while achieving full-color emission
2Adaptability or versatility
If traditional LED packaging structures are used, then full-color display is achieved, but device size and cost increase
Solution Approach 1:
The patent merges multiple functions into a single integrated semiconductor structure. Instead of using separate blue LED chips with phosphor layers and additional packaging components, the invention combines red, green, and blue light-emitting functions directly into one epitaxially grown semiconductor layer, significantly reducing device size while maintaining full-color display capability
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement of light-emitting regions within the semiconductor layer. By distributing red, green, and blue emitting regions across different spatial locations and depths (top surface, side walls, recessed regions), the invention achieves full-color emission from a compact single-layer structure, reducing the need for large packaging assemblies
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 approach reduces the size and cost of full-color LEDs, prolongs their lifetime, and improves reliability by emitting light of different wavelengths without the use of phosphors or quantum dots, while simplifying the manufacturing process.
Implementation Method 1
Light Emitting Diode (LED) emits visible light by using recombination between electrons and holes
Implementation Method 2
achieved through an epitaxial growth process
Data Source
AI summary
Disclosed are a light emitting device and a method for manufacturing a light emitting device. The light emitting device according to the present application may be formed by an epitaxial growth process. In addition, the light emitting device according to the present application includes a first semiconductor layer, a light emitting layer and a second semiconductor layer. Light emitting wavelengths of the first region, the second region and the third region are different by setting composition of the light emitting layer of the top walls of the plurality of protrusions, the side walls of the plurality of protrusions and the recessed region between the plurality of protrusions to be different, therefore, the light-emitting device may emit light of different wavelengths without using phosphors or quantum dots for wavelength conversion, thereby prolonging the lifespan of the light-emitting device and improving the reliability of the light-emitting device.