Di-Chromic Light Structure for Phosphor-Free White Emission
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Solution Overview
Problem
Existing methods for implementing various colors in lighting and display technologies, such as using multiple LEDs with different peak wavelengths or phosphors, are complex and inefficient, leading to issues like phosphor deterioration and increased size.
Innovation Solution
A di-chromic device that generates white light without phosphors, utilizing a structure with a base, conductivity type semiconductor regions, and a color region comprising sub-color portions with different peak wavelengths, optimized for current densities to achieve efficient color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light emitting diodes with different peak wavelengths are used to implement various colors, then color variety is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple color-emitting semiconductor regions (first color portion emitting blue light, second color portion emitting green or yellow light) into a single integrated device structure. This merging approach allows the device to emit multiple colors simultaneously while being manufactured as one unified component, thereby reducing manufacturing complexity compared to assembling multiple separate LEDs.
Solution Approach 2:
The single light emitting device is designed to perform multiple functions by incorporating different color portions within the same structure. The device can emit blue light, green light, yellow light, or white light (combination of blue and green/yellow) depending on the activation and composition ratios of its internal color portions, making it a universal color source that replaces multiple specialized LEDs.
2Adaptability or versatility
If phosphors are used together with light emitting diodes to implement various colors, then color implementation is improved, but device size increases
Solution Approach 1:
The patent integrates the color conversion function directly into the semiconductor structure by creating adjacent color portions within the same light emitting device. Instead of placing phosphor materials externally on separate LEDs, the different color-emitting regions are merged into a single compact structure, eliminating the need for additional phosphor layers and reducing overall device volume.
3Adaptability or versatility
If phosphors are disposed on light emitting diodes to implement various colors, then color conversion is improved, but efficiency is reduced
Solution Approach 1:
The patent extracts the phosphor conversion layer from the system and replaces it with direct semiconductor-based color emission. By removing the phosphor intermediate step, the device eliminates the energy losses associated with phosphor conversion, achieving more efficient light generation while still providing multiple color outputs through the different color portions.
Solution Approach 2:
The patent substitutes the phosphor-based color conversion mechanism with a semiconductor-based direct emission mechanism. Instead of using phosphor materials that absorb and re-emit light at different wavelengths, the device uses different semiconductor compositions and structures to directly generate the desired wavelengths, resulting in improved efficiency.
4Adaptability or versatility
If phosphors and molding members are used to support them, then color implementation is improved, but reliability deteriorates due to phosphor and molding member deterioration
Solution Approach 1:
The patent removes the phosphor material and its supporting molding member structure from the device. By extracting these components that are prone to deterioration, the device achieves improved reliability and longevity while maintaining color implementation capabilities through the semiconductor-based color portions.
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 di-chromic device provides stable and efficient implementation of various colors, eliminating the need for phosphors and reducing size, while enhancing radiation efficiency and visibility by carefully arranging sub-color portions and tunnel barrier layers.
Implementation Method 1
the first color portion may generate blue light, and the second color portion may generate green or yellow light. Furthermore, the di-chromic device may implement white light by a combination of blue light from the first color portion and green or yellow light from the second color portion.
Data Source
AI summary
A di-chromic device according to an embodiment of the present disclosure includes a base, a first conductivity type semiconductor region disposed on the base, a control portion disposed on the first conductivity type semiconductor region, a color region formed on the control portion, and a second conductivity type semiconductor region disposed on the color region, in which the control portion is configured to relieve strain in the color region, the color region includes a first color portion and a second color portion, and the first color portion includes a color material having a composition different from that of the second color portion.