Curved Surface Semiconductor Light-Emitting Device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing semiconductor light-emitting devices face challenges in achieving high light emission efficiency and light density due to internal light reflection and decay, which limits their ability to emit light effectively.
Innovation Solution
A semiconductor light-emitting device with a laminated structure featuring a first and second cladding layer and an active layer, where the outer peripheral surface is shaped as a curved surface protruding outward with an inclination angle ranging from 45° to 55°, increasing the likelihood of total reflection and enhancing light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the end face of the active layer is inclined to set the light emitting direction, then the light emission efficiency is improved, but the structural complexity increases
Solution Approach 1:
The patent applies curvature by forming the peripheral surface of the LED chip as a curved surface that is concave in the laminated direction, rather than using traditional inclined planes. This curved structure guides light through total internal reflection while maintaining a more symmetric and manufacturable form, resolving the contradiction between improving light emission efficiency and reducing structural complexity.
2Loss of energy
If light is reflected multiple times within the light-emitting diode to improve emission efficiency, then the light emission efficiency increases, but the light density decreases due to decay
Solution Approach 1:
The patent applies local quality by creating different surface characteristics in different regions. The curved peripheral surface is designed with specific curvature radius to achieve total internal reflection, while the light emitting face maintains high light density by minimizing reflection paths. This localized optimization allows efficient light extraction without excessive decay.
3Loss of energy
If the peripheral surface is formed as a curved surface protrusively curved outward, then the total reflection probability increases and light emission efficiency improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a curvature radius of 1-10 μm for the peripheral surface, providing a quantifiable parameter range that balances optical performance with manufacturing feasibility. This parameter specification transforms the abstract concept of 'curved surface' into a manufacturable feature with clear tolerances, resolving the contradiction between improved light emission efficiency and manufacturing precision requirements.
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 curved surface design enhances light emission efficiency by increasing the probability of total reflection, resulting in higher light density and improved luminous efficiency compared to traditional designs.
Implementation Method 1
a probability that light directly propagated to this peripheral surface from the active layer through the laminated semiconductor structure portion and light reached this peripheral surface after being reflected on the major surface opposite to the light emitting surface, for example, will be reflected on this curved surface in a total reflection fashion can be increased
Implementation Method 2
the electrode being formed of a metal electrode having high reflectance relative to light from the semiconductor light-emitting portion
Data Source
AI summary
A semiconductor light-emitting device is provided. The semiconductor light-emitting device includes a laminated semiconductor structure portion composed of at least a first conductivity type first cladding layer, an active layer and a second conductivity type second cladding layer, wherein an outer peripheral surface of this laminated semiconductor structure portion is formed as a curved surface shape which is protrusively curved or bent with respect to the outside of the laminated direction.