Radiation-Emitting Semiconductor Body with Monolithic Quantum Well Structure
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Solution Overview
Problem
Conventional light-emitting diodes require precise phosphor matching and application for generating mixed-color radiation, which is inefficient and can result in undesirable colored appearance in the switched-off state, along with radiation losses due to phosphor-induced scattering.
Innovation Solution
A semiconductor body with a monolithically integrated active layer and re-emission layer, featuring a quantum well structure and barrier layer structure, which absorbs and converts radiation to generate incoherent mixed-color radiation without the need for phosphor, thereby increasing efficiency and allowing for precise control of optical parameters during production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If phosphor is used to convert radiation wavelength in conventional light-emitting diodes, then mixed-color radiation can be generated, but radiation losses occur due to phosphor-induced scattering and precise matching is required
Solution Approach 1:
The patent extracts and eliminates the phosphor component from the light-emitting diode structure. Instead of using phosphor for wavelength conversion, the invention employs a quantum well structure with barrier layers that directly generate the desired wavelengths through quantum confinement effects, thereby removing the source of radiation scattering losses
Solution Approach 2:
The patent changes the fundamental parameter of wavelength generation from phosphor-based downconversion to quantum well-based direct emission. By adjusting quantum well width, barrier layer thickness, and material composition, precise wavelength control is achieved without phosphor, eliminating scattering losses while simplifying production
2Illumination intensity
If phosphor is precisely matched and applied in conventional light-emitting diodes, then mixed-color radiation can be generated, but the process becomes complex and efficiency decreases
Solution Approach 1:
The patent merges the functions of wavelength selection and light emission into a single integrated quantum well structure. The barrier layer structure with multiple quantum wells simultaneously generates multiple wavelengths through direct emission, eliminating the need for separate phosphor matching and application processes while maintaining high mixed-color radiation quality
Solution Approach 2:
The quantum well structure serves multiple functions: it generates primary radiation, converts wavelengths through quantum confinement, and produces mixed-color output all within a single monolithic layer. This multi-functional design simplifies the device structure while maintaining illumination quality
3Illumination intensity
If phosphor is used in conventional light-emitting diodes, then wavelength conversion can be achieved, but colored appearance in switched-off state occurs which is undesirable
Solution Approach 1:
The patent converts the potential harm of unwanted colored appearance into a benefit by designing the quantum well structure to emit only in the desired spectral ranges. The quantum confinement effects ensure that no spurious wavelengths are generated, so the device shows no colored appearance when switched off, while maintaining efficient wavelength conversion during operation
4Productivity
If conventional phosphor-based light-emitting diodes are produced, then mixed-color radiation can be generated, but separate production steps are required which reduce efficiency
Solution Approach 1:
The patent segments the light-emitting function into multiple quantum wells with different width configurations within a single monolithic structure. Each quantum well region can be independently optimized for specific wavelengths during epitaxial growth, allowing all wavelength conversions to be achieved in one production step rather than requiring separate phosphor application steps
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 eliminates phosphor-related losses, simplifies production, and allows for the generation of efficient, high-quality mixed-color radiation with controlled optical parameters, avoiding undesirable colored appearances and reducing production costs.
Implementation Method 1
the re-emission layer for generation of incoherent radiation of a second wavelength by absorption of the radiation of the first wavelength in the Barrier layer structure
Implementation Method 2
a quantum well structure with a quantum layer structure and a barrier layer structure
Data Source
AI summary
A radiation-emitting semiconductor body (1) is described, comprising an active layer (2) for generating radiation having a first wavelength (?1) and a re-emission layer (3), which has a quantum well structure (4) having a quantum layer structure (5) and a barrier layer structure (6). The re-emission layer is provided for generating incoherent radiation having a second wavelength (?2) by means of absorption of the radiation having the first wavelength in the barrier layer structure.