White Light Emitting Device With Segmented Quantum Wells
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Solution Overview
Problem
Conventional white-light emitting diodes have a narrow chromatic range, limiting their application to devices requiring a wider color gamut, such as display panels, and are structurally complex and costly.
Innovation Solution
A single-device white-light emitting device structure comprising a substrate, a short wavelength light source, a protective layer, a first structure with a quantum well layer, and a second structure, which generates a white light by mixing red, blue, and green lights produced through photoelectric effects, simplifying the design and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a blue chip and yellow fluorescent powder structure is used, then light-emitting efficiency is satisfactory, but chromatic range is too narrow
Solution Approach 1:
The patent segments the light generation process into three separate quantum well layers (first, second, and third quantum well layers) that emit blue, green, and red lights respectively. Each layer is responsible for generating a specific color component, and these segmented light sources are then combined to form white light with a wide chromatic range while maintaining high efficiency
Solution Approach 2:
The patent employs a composite structure combining multiple quantum well layers with different bandgap energies within a single light-emitting device. The first quantum well layer uses materials for blue light emission, the second for green, and the third for red, creating a composite material system that simultaneously achieves wide chromatic range and high light-emitting efficiency
2Adaptability or versatility
If multiple separate components are used to achieve wide chromatic range, then color saturation improves, but device complexity increases
Solution Approach 1:
The patent merges three separate light-generating quantum well layers into a single integrated light-emitting device structure. The first, second, and third quantum well layers are stacked within one device, eliminating the need for multiple separate LEDs or complex optical combining systems, thus achieving wide chromatic range while simplifying the overall device structure
Solution Approach 2:
The single light-emitting device structure performs multiple functions simultaneously: it generates blue light from the first quantum well layer, green light from the second quantum well layer, and red light from the third quantum well layer. This multi-functional design achieves wide chromatic range without increasing device complexity, as one device structure accomplishes what would traditionally require multiple components
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
The solution provides a white-light emitting device with enhanced color saturation and a simpler, more cost-effective structure suitable for mass production, capable of producing a wider color gamut, thus addressing the limitations of conventional diodes.
Implementation Method 1
a blue chip and a yellow fluorescent powder structure. Although the light-emitting efficiency thereof is satisfactory
Implementation Method 2
The principle of the conventional white-light emitting diode 10 utilizes a fluorescent powder material to absorb blue light from a light source so as to generate a yellow light or red and green light
Implementation Method 3
The first structure is disposed on the protective layer for generating a second light, and the first structure comprises a first quantum well layer disposed on the protective layer
Data Source
AI summary
A white-light emitting device comprises a substrate, a short wavelength light source, a protective layer, a first structure, and a second structure. The short wavelength light source is disposed on the substrate for generating a first light, and the protective layer covering the short wavelength light source is pervious to the first light. The first structure is disposed on the protective layer for generating a second light, in which the first structure includes a first quantum well and a transmission layer. The second structure is disposed on the first structure for generating a third light. Finally, the first light, the second light, and the third light are mixed to generate a white light.