Transparent Carrier for Semiconductor Light Emitting Device
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Solution Overview
Problem
Light-emitting diodes (LEDs) face inefficiencies in light extraction due to total internal reflection and absorption within the active layer, leading to reduced light output as reflected rays oscillate and are gradually absorbed, rather than being effectively directed outward.
Innovation Solution
A semiconductor light-emitting device with a transparent carrier having an area larger than the active layer, which enhances light extraction efficiency by allowing more rays to escape through the transparent substrate and reducing absorption, using a structure where the transparent carrier's surface area is optimized to minimize re-reflection and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflection layer is added to reflect light back into the LED, then light direction control is improved, but light extraction efficiency deteriorates due to multiple reflections and absorption
Solution Approach 1:
The patent removes the reflection layer from the LED structure to eliminate the harmful multiple reflections and absorption losses. By extracting this component, the invention allows light to escape directly through the transparent carrier without being reflected back into the active layer, thus resolving the contradiction between light direction control and light extraction efficiency.
Solution Approach 2:
The patent introduces a transparent carrier as an intermediary element between the LED and the external environment. This carrier has a larger area than the active layer and provides a direct light extraction path, mediating the light output without causing the harmful effects of reflection layers while maintaining proper light direction.
2Loss of energy
If the carrier area is increased beyond the active layer area, then light extraction efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the device into distinct functional layers: the active layer for light generation and the transparent carrier for light extraction. The carrier is designed with a specific area larger than the active layer, creating a clear functional separation that improves light extraction while maintaining manageable structural complexity through defined segmentation.
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 solution significantly increases light extraction efficiency by reducing the absorption of reflected rays within the active layer, resulting in improved light output and power ratios, particularly evident in LEDs with different wavelengths, where the power can be enhanced by up to 1.8 times with appropriate carrier sizes and materials.
Implementation Method 1
the difference of the refraction coefficients between LED materials and environment mediums results in that light illuminating on the boundary of the LED undergoes total reflection over a particular incident angle
Implementation Method 2
When the first ray R1 passes through the active layer 131, a portion of the first ray R1 is absorbed by the active layer 131
Data Source
AI summary
This invention relates to a semiconductor light-emitting device including a semiconductor light-emitting chip and a transparent carrier. The semiconductor light-emitting chip includes an active layer and transparent substrate. The active layer emits light under a bias. At least a portion of the light emitted from the active layer enters into the transparent carrier through the transparent substrate. The semiconductor light-emitting chip is coupled to the transparent carrier through the transparent substrate. The area of the transparent carrier is larger than that of the active layer.