LED Laminated Structures for Light Extraction
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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, laminated structures made of transparent insulating layers with gradually decreasing refractive indices, and a transparent conductive layer to enhance light-extraction 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 introduces laminated structures composed of multiple transparent insulating layers with different refractive indices as intermediary elements between the semiconductor layer and the external environment. These intermediate layers serve as optical mediators that gradually transition the refractive index, reducing reflection and enhancing light extraction without fundamentally changing the basic LED structure
Solution Approach 2:
The patent employs composite material structures by combining multiple transparent insulating layers with different refractive indices in a laminated configuration. This composite approach creates a graded refractive index profile that optimizes optical performance while maintaining structural integrity and manufacturability
2Ease of manufacture
If the refractive index mismatch between semiconductor layer and external medium is large, then manufacturing is easier, but light reflection is high
Solution Approach 1:
The patent changes the optical parameter (refractive index) by introducing intermediate layers with progressively varying refractive indices between the high-index semiconductor layer and the low-index external medium. This parameter transition approach reduces the abrupt refractive index mismatch, thereby minimizing reflection losses while maintaining manufacturing simplicity
3Loss of energy
If transparent insulating layers with gradually decreasing refractive indices are stacked, then light-extraction efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the optical path into multiple discrete transparent insulating layers, each with a specific refractive index. This segmentation allows for systematic control of light propagation and extraction while maintaining clear manufacturing guidelines for each individual layer, balancing performance improvement with制造 feasibility
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 reduces light reflection and increases transmittance, improving light-extraction efficiency and current density, thereby enhancing overall lighting efficiency.
Implementation Method 1
each laminated structure is formed of a plurality of transparent insulating layers with respective refractive indices. The values of the refractive indices of the transparent insulating layers are between the value of the refractive index of the second doping type semiconductor layer and the value of the refractive index of the transparent conductive layer
Implementation Method 2
each of the laminated structures is formed in a way of upwardly stacking the transparent insulating layers in sequence with the refractive indices of the transparent insulating layers decreasing gradually
Data Source
AI summary
The invention discloses a light-emitting diode. In an embodiment, the light-emitting diode includes a substrate, a first doping type semiconductor layer, a second doping type semiconductor layer, a light-emitting layer and plural laminated structures. The first doping type semiconductor layer, the light-emitting layer and the second doping type semiconductor layer are formed on the substrate in sequence. The plural laminated structures are formed on the top surface of the second doping type semiconductor layer such that the top surface is partially exposed. Each laminated structure consists of plural transparent insulating layers which have their respective refractive indices. Additionally, each of the laminated structures is formed in a way of upwardly stacking the transparent insulating layers in sequence with the refractive indices of the transparent insulating layers decreasing gradually, so as to enhance the light-extraction efficiency and the lighting efficiency of the light-emitting diode.