Quantum Dot Rod LED Structure for Carrier Leakage Control
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Solution Overview
Problem
Current light-emitting elements face challenges in maintaining high luminous efficiency due to carrier flow out of quantum dots through contact surfaces and side surfaces, leading to decreased performance.
Innovation Solution
A light-emitting element design featuring a cylindrical or hexagonal rod shape with a cover layer of InxGa1-xN quantum dots, where the quantum dots are spaced apart and have a different indium content than the cover layer, reducing carrier flow and enhancing confinement within the quantum dots, and an insulating film surrounds the semiconductor and electrode layers to prevent electrical shorts and maintain efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If quantum dots are used in the active layer, then light emission is achieved, but carriers flow out through contact surfaces and side surfaces causing decreased luminous efficiency
Solution Approach 1:
An insulating film is formed around the outer peripheral surfaces of the semiconductor layers and electrode layers to completely surround the quantum dots. This insulating shell prevents carrier leakage through the side surfaces and contact surfaces, thereby improving luminous efficiency by confining carriers within the quantum dots.
2Reliability
If the light-emitting element has a rod shape with insulating film, then carrier confinement is improved, but manufacturing complexity increases
Solution Approach 1:
The light-emitting element is designed with a rod shape (cylindrical or hexagonal prism) rather than a flat planar structure. This curved/three-dimensional geometry, combined with the insulating film coating the outer peripheral surfaces, provides effective carrier confinement while maintaining a relatively simple manufacturing process through sequential layer deposition and wrapping.
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 configuration improves luminous efficiency by confining carriers within the quantum dots and reducing leakage currents, thereby enhancing the overall performance of the light-emitting element.
Implementation Method 1
the plurality of quantum dots and the cover layer include InxGa1-xN where x is 0.1 to 0.3... the In content of the plurality of quantum dots is different from an indium (In) content of the cover layer
Data Source
AI summary
A light-emitting element comprises a first semiconductor layer, an active layer provided on the first semiconductor layer, a second semiconductor layer provided on the active layer, an electrode layer provided on the second semiconductor layer, and an insulating film around outer peripheral surfaces of the first semiconductor layer, the active layer, the second semiconductor layer, and the electrode layer, wherein the active layer includes a cover layer including a plurality of quantum dots, and the first semiconductor layer, the active layer, the second semiconductor layer, and the electrode layer are sequentially stacked in one direction to form a shape of a rod.