LED with Alternating Refractive Index Laminated Structures
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Solution Overview
Problem
Current light-emitting diodes face challenges in achieving high lighting efficiency due to limitations in internal quantum yield and light-extraction efficiency, despite various structural designs.
Innovation Solution
The light-emitting diode structure incorporates a substrate, first and second doping type semiconductor layers, and laminated structures formed by alternately stacking high and low refractive index insulating layers, which are partially exposed and covered by a conductive layer, enhancing light reflection and current density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional light-emitting diode structures are used, then manufacturing is simpler, but light-extraction efficiency is low
Solution Approach 1:
The patent applies composite materials by stacking multiple insulating layers with alternating high and low refractive indices on the semiconductor layer. This laminated composite structure creates optical interference effects that enhance light extraction efficiency while maintaining a relatively simple manufacturing process compatible with existing semiconductor fabrication techniques.
Solution Approach 2:
The patent changes optical parameters by carefully controlling the thickness of each insulating layer to be approximately one-quarter of the emission wavelength. This parameter optimization creates constructive interference for light extraction while the alternating refractive indices maximize the optical contrast effect, significantly improving light extraction efficiency.
2Stability of the object's composition
If uniform current distribution is maintained, then device operation is stable, but lighting efficiency is limited
Solution Approach 1:
The patent applies local quality by creating non-uniform current distribution through the laminated insulating layer structure. The alternating high and low refractive index layers create regions of different electrical field concentration, leading to enhanced current density in specific areas. This localized current enhancement increases radiative recombination efficiency and improves overall lighting efficiency while maintaining stable device operation.
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 light-extraction efficiency by concentrating light and elevates current density, thereby enhancing overall lighting efficiency.
Implementation Method 1
the laminated structures are formed in a way of alternately stacking at least one first insulated layer with a high refractive index and at least one second insulated layer with a low refractive index... the laminated structures may reflect the light from the light-emitting layer
Implementation Method 2
Each laminated structure is formed in a way of alternately stacking at least one first insulated layer with a high refractive index and at least one second insulated layer with a low refractive index
Implementation Method 3
the laminated structures may block the current and elevate the current density... the conductive layer is formed to cover the laminated structures and the exposed part of the top surface
Data Source
AI summary
The invention discloses a light-emitting diode, including a substrate, a first conductive type semiconductor layer, a second conductive type semiconductor layer, a light-emitting layer and plural laminated structures. The first conductive type semiconductor layer, the light-emitting layer and the second conductive type semiconductor layer are formed on the substrate in sequence. The plural laminated structures are formed on the upper surface of the second conductive type semiconductor layer such that the upper surface is partially exposed. Each laminated structure consists of at least one first insulated layer with a high refractive index and at least one second insulated layer with a low refractive index, where the at least one first insulated layer and the at least one second insulated layer are alternately formed to obtain said each laminated structure. Thereby, light emitted from the light-emitting layer can be reflected by the laminated structures to enhance the light-extraction efficiency.