Concave Polygon Light Emitting Element for High Extraction Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light emitting elements suffer from reduced light extraction efficiency due to total internal reflection and absorption by electrodes, which limits their performance.
Innovation Solution
A light emitting element with a concave polygon planar shape featuring acute and reentrant angles is designed, reducing the distance light travels before extraction and minimizing absorption, thereby enhancing light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional light emitting elements with standard geometric shapes are used, then manufacturing is straightforward, but light extraction efficiency is reduced due to total internal reflection and electrode absorption
Solution Approach 1:
The patent applies asymmetry by using a concave polygonal planar shape instead of conventional symmetric shapes like rectangles or circles. This asymmetric geometry creates varied light propagation paths that reduce total internal reflection and improve light extraction efficiency while remaining manufacturable through standard semiconductor fabrication processes.
Solution Approach 2:
The patent employs curved surfaces through the concave polygonal geometry, where the bent surfaces redirect light paths and reduce the distance light travels through the semiconductor material. This curvature effect minimizes absorption by electrodes and improves overall light extraction without requiring complex manufacturing steps.
2Power
If light travels a longer distance in the semiconductor material, then more light can be generated, but absorption by electrodes increases and light extraction efficiency decreases
Solution Approach 1:
The concave polygonal shape with curved surfaces redirects light paths to exit the device more quickly, reducing the propagation distance through the semiconductor material. This minimizes absorption losses by electrodes while maintaining or enhancing overall light output power.
3Loss of energy
If standard geometric shapes are used for light emitting elements, then manufacturing processes are simple, but light extraction efficiency is compromised due to repeated total internal reflection
Solution Approach 1:
The concave polygonal planar shape introduces asymmetric geometry that disrupts repeated total internal reflection patterns. This asymmetric design improves light extraction efficiency while remaining compatible with standard semiconductor fabrication processes, maintaining ease of manufacture.
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 concave polygon shape significantly improves light extraction efficiency by reducing total internal reflection and absorption, leading to higher output and simpler manufacturing processes.
Implementation Method 1
arranging outer surfaces of the light emitting element so as to form an acute angle therebetween reduces an angle, at which the light having undergone total internal reflection in the light emitting element is incident upon the next surface, and this can suppress repetition of total internal reflection in the light emitting element
Data Source
AI summary
A light emitting element includes a semiconductor including an active layer, and a planar shape of the light emitting elements including a concave polygon. The planar shape of the concave polygon has interior angles including at least one acute angle.