Multi-Layer Light-Emitting Element for Wider Color Gamut
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Solution Overview
Problem
Existing light-emitting elements, such as LEDs, face challenges in achieving high brightness, luminous efficiency, and color reproduction range, particularly in display devices where brightness deviations occur across different colors.
Innovation Solution
The light-emitting element is designed with multiple sub-light-emitting layers in each of its light-emitting layers, where the layers within each layer emit light with different wavelengths, and the aluminum content of these layers increases in a specific direction to mitigate lattice parameter differences and enhance film quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple sub-light-emitting layers with different wavelengths are used, then color reproduction range is improved, but device complexity increases
Solution Approach 1:
The light-emitting layer is divided into multiple sub-light-emitting layers (first sub-light-emitting layer, second sub-light-emitting layer, third sub-light-emitting layer), each emitting different wavelengths. This segmentation enables broader color reproduction range while managing complexity through systematic layer design with varying aluminum contents.
Solution Approach 2:
Each sub-light-emitting layer has a specific aluminum content range (first: 5-15%, second: 15-25%, third: 25-35%) tailored to its function. This local quality variation optimizes light emission at different wavelengths while maintaining overall device performance and managing structural complexity.
2Reliability
If aluminum content increases in specific direction, then film quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The aluminum content is systematically varied across different sub-light-emitting layers (increasing from 5-15% to 25-35% in the vertical direction). This parameter change improves film quality and reduces lattice parameter differences while establishing clear manufacturing specifications for each layer.
3Illumination intensity
If multiple light-emitting layers are stacked, then brightness is improved, but luminous efficiency may deteriorate
Solution Approach 1:
Each sub-light-emitting layer uses optimized aluminum content (5-35% range) to maximize light emission efficiency. This parameter optimization ensures high brightness from multiple layers while minimizing energy loss through improved carrier injection and recombination efficiency.
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 design improves brightness and luminous efficiency while expanding the color reproduction range, minimizing brightness deviations across colors, and enhances film quality.
Implementation Method 1
a first light-emitting layer disposed on the first semiconductor layer, a tunnel layer disposed on the first light-emitting layer, a second light-emitting layer disposed on the tunnel layer and configured to emit light with a wavelength different from a wavelength of light emitted from the first light-emitting layer
Data Source
AI summary
Discussed are a light-emitting element and a display device including the light-emitting element. The light-emitting element in one example includes a first semiconductor layer, a first light-emitting layer disposed on the first semiconductor layer, a tunnel layer disposed on the first light-emitting layer, a second light-emitting layer disposed on the tunnel layer and configured to emit light with a wavelength different from a wavelength of light emitted from the first light-emitting layer, and a second semiconductor layer disposed on the second light-emitting layer. The first light-emitting layer includes a plurality of first sub-light-emitting layers configured to emit light with different wavelengths. The second light-emitting layer includes a plurality of second sub-light-emitting layers configured to emit light with different wavelengths.