Optimized LED Design for Enhanced Efficiency and Reliability
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Summary
Problems
Current light emitting diodes (LEDs) face challenges in reducing leakage current, improving current spreading, achieving superior crystalline quality, enhancing internal quantum efficiency, and minimizing the piezoelectric effect, which affect their brightness and efficiency.
Innovation solutions
The design includes a light emitting device structure with a first and second conductive semiconductor layer, both containing aluminum (Al), where the second conductive semiconductor layer has a higher Al content than the first, and an active layer with a multi-quantum well structure, optimized through specific growth temperatures and compositions to enhance crystalline quality and reduce defects, thereby improving current spreading and quantum efficiency while minimizing the piezoelectric effect.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If conventional LED structures are used, then manufacturing is simpler, but leakage current increases and efficiency decreases
Why choose this principle:
The semiconductor structure is segmented into multiple distinct layers with specific Al content gradients: a first conductive layer (Al content 0.01-0.2), an active layer (Al content 0.1-0.5), and a second conductive layer (Al content 0.2-0.5). This segmentation creates optimized electrical and optical properties in each layer, reducing leakage current while maintaining manageable manufacturing complexity through systematic composition control.
Principle concept:
If conventional LED structures are used, then manufacturing is simpler, but leakage current increases and efficiency decreases
Why choose this principle:
Different regions of the semiconductor structure are assigned different Al contents tailored to local functional requirements. The first conductive layer has lower Al content for optimal carrier transport, the active layer has intermediate Al content for efficient light emission, and the second conductive layer has higher Al content for enhanced electrical confinement. This local quality optimization reduces leakage current without requiring overly complex global restructuring.
Application Domain
Data Source
AI summary:
The design includes a light emitting device structure with a first and second conductive semiconductor layer, both containing aluminum (Al), where the second conductive semiconductor layer has a higher Al content than the first, and an active layer with a multi-quantum well structure, optimized through specific growth temperatures and compositions to enhance crystalline quality and reduce defects, thereby improving current spreading and quantum efficiency while minimizing the piezoelectric effect.
Abstract
Disclosed are a light emitting device, a method of manufacturing the same, a light emitting device package, and a lighting system. The light emitting device includes a first conductive semiconductor layer (130), a second conductive semiconductor layer (150), and an active layer (140) interposed between the first and second conductive semiconductor layers. The first conductive semiconductor layer, the active layer, and the second conductive semiconductor layer include Al. The second conductive semiconductor layer has Al content higher than Al content of the first conductive semiconductor layer. The first conductive semiconductor layer has Al content higher than Al content of the active layer.