Amorphous Inorganic Quantum Well LED for Stable Surface Emission
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Solution Overview
Problem
Existing light emitting elements, both organic and inorganic, face limitations such as vulnerability to oxygen, moisture, and heat due to their material compositions, leading to short lifespan and restricted applications, especially in display devices where surface light emission is desired.
Innovation Solution
A light emitting element with an amorphous inorganic quantum well emission layer, comprising alternating layers of magnesium and zinc compounds, which are resistant to crystal defects and provide stable surface light emission, combined with inorganic hole and electron transport layers for enhanced durability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic or conventional inorganic materials are used in light emitting elements, then light emission function is achieved, but vulnerability to oxygen, moisture, and heat leads to short lifespan
Solution Approach 1:
The emission layer uses a composite structure of alternating amorphous inorganic layers (Mg-containing layer and Zn-containing layer) forming a quantum well. This composite inorganic structure provides both light emission functionality and resistance to oxygen, moisture, and heat, resolving the contradiction between achieving light emission and resisting environmental degradation.
Solution Approach 2:
The patent changes the physical state parameter of the inorganic materials from crystalline to amorphous form. This parameter change eliminates crystal defects that would otherwise create vulnerability points, thereby improving reliability and resistance to environmental factors while maintaining light emission properties.
2Reliability
If monocrystalline inorganic materials are used, then light emission efficiency is achieved, but crystal defects reduce stability and lifespan
Solution Approach 1:
The patent fundamentally changes the structural parameter from monocrystalline to amorphous state. This eliminates the presence of crystal defects entirely, as amorphous materials lack the long-range order that creates defects in crystalline structures. The alternating amorphous inorganic layers maintain light emission efficiency while providing superior stability without crystal defect susceptibility.
3Illumination intensity
If conventional emission layers are used, then light emission is achieved, but surface light emission stability is insufficient for display devices
Solution Approach 1:
The emission layer employs a composite of alternating amorphous inorganic layers with different band gaps (Mg-containing and Zn-containing layers) forming a quantum well structure. This composite structure provides stable surface light emission suitable for display devices while simultaneously offering resistance to environmental factors through the amorphous inorganic composition.
Solution Approach 2:
The patent applies local quality by creating alternating layers with different materials and band gap properties within the emission layer. The Mg-containing layers and Zn-containing layers have different local properties that, when combined, achieve both stable surface light emission and environmental resistance, with each layer contributing specific characteristics to the overall performance.
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 achieves high stability against environmental factors like oxygen and moisture, enabling long-lasting and efficient surface light emission suitable for display devices, while avoiding the limitations of monocrystalline inorganic elements and organic materials.
Implementation Method 1
an emission layer between the first electrode and the second electrode. The emission layer includes a quantum well that includes a first layer and a second layer, each having a different band gap
Implementation Method 2
Light emitting element including a first electrode, a second electrode overlapping the first electrode, and an emission layer between the first electrode and the second electrode
Data Source
AI summary
A light emitting element includes a first electrode, a second electrode overlapping the first electrode, and an emission layer between the first electrode and the second electrode. The emission layer includes a quantum well that includes a first layer and a second layer, each having a different band gap. The first layer includes magnesium, and the second layer includes zinc. The first layer and the second layer are amorphous.