Core/Shell Nanowire Optoelectronic Device for Multi-Wavelength Emission
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Solution Overview
Problem
Current optoelectronic devices based on nanowires struggle to efficiently emit multi-wavelength light, particularly white light, due to limitations in controlling the emission quality and efficiency, often requiring phosphors or multiple materials with varying electrical behaviors, which lead to inefficiencies and difficulty in achieving desired color rendering and temperature.
Innovation Solution
An optoelectronic device with a core/shell nanowire structure featuring an active zone comprising two types of quantum wells in different regions, allowing for controlled emission of multi-wavelength light by varying the electrical contact zones and power supply, eliminating the need for phosphors and using the same material throughout, thus simplifying production and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If phosphors or multiple materials are used to generate white light, then multi-wavelength emission is achieved, but efficiency losses occur and color rendering control becomes difficult
Solution Approach 1:
The active zone is segmented into two distinct regions: a first peripheral region surrounding the core and a second upper region situated on the end of the core. Each region contains quantum wells that emit at different wavelengths, enabling multi-wavelength emission without phosphors. This segmentation allows independent control of emission characteristics from each region.
Solution Approach 2:
Different regions of the active zone are赋予 different emission properties. The first peripheral region and second upper region are designed to emit at different wavelengths, allowing the device to produce multi-wavelength light with controlled color rendering. The electrical contact zones are also differentiated to control which regions are active.
2Illumination intensity
If phosphors are used to convert wavelength, then white light is generated, but phosphorus conversion efficiency losses are significant
Solution Approach 1:
The invention extracts and eliminates the phosphor conversion step from the light generation process. Instead of using a single-wavelength LED with phosphor down-conversion, the device directly emits multiple wavelengths from the semiconductor active zone itself, removing the source of phosphorus conversion efficiency losses.
3Illumination intensity
If multiple LEDs emitting different wavelengths are associated, then white light can be generated, but color rendering index and color temperature control becomes difficult
Solution Approach 1:
Multiple emission wavelengths are merged into a single integrated device structure rather than using separate LEDs. The first and second regions of the active zone emit at different wavelengths simultaneously, and by controlling the electrical contact zones, the device can adjust the relative intensities to achieve desired color rendering index and color temperature.
Solution Approach 2:
The device provides dynamic control over color rendering characteristics by selectively activating different regions through the electrical contact zones. The power supply can be controlled to vary the emission intensity from each region, enabling adjustment of color temperature and color rendering index according to application requirements.
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 device achieves efficient and controlled emission of multi-wavelength light, including white light, with improved color rendering and temperature control, by leveraging the distinct emission properties of radial and axial quantum wells, enhancing light quality and production efficiency.
Implementation Method 1
the active zone which comprises quantum wells... By increasing the concentration of Indium, it is possible to reduce the gap of this ternary material... to scan the entire visible spectrum
Data Source
Figure 1~5
Figure 3a~3d
Figure 3e~3g
AI summary
The invention relates to an optoelectronic device comprising light-emitting means taking the form of nanowires (1, 7) having a core/shell structure and produced on a substrate (11), said nanowires comprising an active zone (12, 72) comprising at least two types of quantum wells associated with different emission wavelengths and arranged in at least two different regions (120, 121; 720, 721, 722) of said active zone, a first region (120, 720) of the active zone (12, 72) of the nanowires (1, 7) being a peripheral and substantially vertical part at least partially encircling the core (10, 70) of the nanowires and comprising radial quantum wells, and a second region (121, 721) of this active zone being an upper and substantially horizontal part located on the end of the core of the nanowires, with axial quantum wells, the device furthermore comprising a first electrical contact zone (15) on the substrate and a second electrical contact zone (16, 51; 17, 81) on the emitting means, the second zone being arranged such that, the emitting means being arranged in at least two sets, the electrical contact is made for each of said at least two sets at least in a different region of the active zone and via a continuous conductive layer, the electrical supply of power being controlled so as to obtain a multi-wavelength light emission.