Light-Emitting Element Shell Layer for Defect Compensation
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Solution Overview
Problem
Display devices, particularly light-emitting elements, face efficiency issues due to defects in semiconductor layers, which lead to reduced emission efficiency and increased heat generation.
Innovation Solution
A light-emitting element is designed with semiconductor layers doped to have specific polarities, a light-emitting layer in between, and a shell layer formed on the semiconductor layers using divalent metal elements like ZnS, ZnSe, MgS, or MgSe to compensate for defects, along with an insulating film to protect and enhance emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If semiconductor layers are used in light-emitting elements, then the device can emit light, but defects in the semiconductor layers reduce emission efficiency and increase heat generation
Solution Approach 1:
A shell layer comprising a divalent metal element is introduced as an intermediary between the semiconductor layer and the external environment. This shell layer compensates for defects in the semiconductor layer, reducing non-radiative recombination centers and improving emission efficiency while minimizing heat generation from defective regions.
Solution Approach 2:
The shell layer changes the physical and chemical parameters at the surface of the semiconductor layer by introducing divalent metal elements. This modification alters the electronic structure and defect characteristics of the semiconductor surface, thereby improving emission efficiency and reducing harmful thermal effects.
2Loss of energy
If a shell layer comprising a divalent metal element is formed on semiconductor layers, then defects are compensated for and emission efficiency improves, but the device structure becomes more complex
Solution Approach 1:
The shell layer is applied locally only to the regions where defect compensation is needed, specifically on the semiconductor layers. This localized approach improves emission efficiency at critical interfaces without unnecessarily complicating the entire device structure, maintaining simplicity in non-critical areas.
3Loss of energy
If an insulating film is added to cover the outer surface of the shell layer, then the shell layer's defect-compensating function is protected and emission efficiency is enhanced, but manufacturing steps increase
Solution Approach 1:
The shell layer is formed preliminarily on the semiconductor layers before final device assembly and operation. This preliminary defect compensation ensures that subsequent manufacturing steps work with already-optimized semiconductor surfaces, improving emission efficiency without requiring complex post-processing to fix defects.
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 solution effectively compensates for defects in semiconductor layers, improving emission efficiency and reducing heat generation, thereby enhancing the performance of light-emitting elements in display devices.
Implementation Method 1
a shell layer formed on a side surface of the first semiconductor layer, a side surface of the light-emitting layer, and a side surface of the second semiconductor layer, the shell layer including a divalent metal element
Data Source
AI summary
A light-emitting element includes a first semiconductor layer doped to have a first polarity, a second semiconductor layer doped to have a second polarity different from the first polarity, a light-emitting layer disposed between the first and second semiconductor layers, a shell layer formed on side surfaces of the first semiconductor layer, the light-emitting layer, and the second semiconductor layer, the shell layer including a divalent metal element, and an insulating film covering an outer surface of the shell layer and surrounding the side surface of the light-emitting layer.