Stacked Light-Emitting Layers With Temperature-Tuned Crystallinity
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Solution Overview
Problem
Existing methods for manufacturing light-emitting elements face challenges in achieving high luminous efficiency due to degradation in crystallinity of semiconductor layers, particularly in the formation of multi-quantum well structures, which affects the overall performance of the light-emitting elements.
Innovation Solution
The method involves forming the first and second active layers at different temperature regimes, with the second active layer being formed at a higher temperature than the first, to improve the crystallinity and reduce thermal stress, thereby enhancing the luminous efficiency of the light-emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the second active layer is formed at a higher temperature than the first active layer, then the crystallinity of the second active layer is improved, but the thermal stress in the structure increases
Solution Approach 1:
The patent applies parameter changes by varying the formation temperature of different active layers. Specifically, the second active layer is formed at a higher temperature (second temperature) than the first active layer (first temperature), where the temperature difference is 50°C or more. This temperature parameter change improves the crystallinity of the second active layer while the patent manages the resulting thermal stress through controlled temperature gradients and intermediate layers.
2Reliability
If multiple active layers are formed in sequence, then the luminous efficiency is improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the light-emitting structure into multiple independent active layers (first active layer and second active layer), each with its own n-type semiconductor layer and p-type semiconductor layer. This segmentation allows each layer to be optimized independently for luminous efficiency while contributing to the overall performance of the light-emitting element.
Solution Approach 2:
The patent applies preliminary action by forming the first active layer and its associated semiconductor layers before forming the second active layer. This sequential formation process establishes a stable foundation with proper crystallinity and electrical properties before adding subsequent layers, simplifying the overall manufacturing process by preventing defects that would require rework.
3Manufacturing precision
If the temperature difference between forming first and second barrier layers is increased, then the crystallinity improvement is enhanced, but the thermal decomposition risk increases
Solution Approach 1:
The patent applies parameter changes by optimizing the temperature difference between forming the first barrier layer (first temperature) and the second barrier layer (second temperature). The temperature difference is set to 50°C or more to improve crystallinity, but the absolute temperatures are controlled to remain below decomposition thresholds. This balanced parameter selection achieves crystallinity improvement while avoiding thermal decomposition.
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 approach improves the crystallinity of the second active layer, leading to increased luminous efficiency and reduced thermal decomposition, resulting in enhanced performance of the light-emitting element.
Implementation Method 1
reduce thermal stress
Implementation Method 2
improve the crystallinity of the second active layer
Data Source
AI summary
A method for manufacturing a light-emitting element includes: forming a first light-emitting part comprising a first n-type semiconductor layer, a first active layer on the first n-type semiconductor layer, and a first p-type semiconductor layer on the first active layer; forming an intermediate layer on the first light-emitting part; and forming a second light-emitting part on the intermediate layer, the second light-emitting part comprising a second n-type semiconductor layer, a second active layer on the second n-type semiconductor layer, and a second p-type semiconductor layer on the second active layer.