Flip-Chip Light-Emitting Device Intermediate Layer Refractive Index
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Solution Overview
Problem
Existing light-emitting devices with flip-chip package structures face challenges in enhancing light-emitting efficiency due to total light reflection issues.
Innovation Solution
A light-emitting device design featuring an intermediate layer with a refractive index between the substrate and semiconductor window layer, combined with a transparent bonding layer and a mirror layer, to attenuate total light reflection and improve light escape, including a patterned substrate and porous structure for enhanced light scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flip-chip package structure is used with direct bonding between substrate and semiconductor window layer, then device integration is achieved, but total light reflection occurs at the interface reducing light-emitting efficiency
Solution Approach 1:
An intermediate layer with refractive index n2 is introduced between the substrate (refractive index n1) and the semiconductor window layer (refractive index n3), where n1 < n2 < n3. This intermediate layer acts as an optical mediator that gradually transitions the refractive index, reducing the abrupt index mismatch at the interface and thereby attenuating total internal reflection of light.
Solution Approach 2:
The refractive index parameter is gradually changed through the intermediate layer, creating a gradient from n1 to n3. This parameter transition reduces the optical impedance mismatch, allowing light to pass through the interface with minimal reflection and improving light-emitting efficiency.
2Illumination intensity
If high refractive index materials are used to improve light extraction, then light escape is enhanced, but total internal reflection increases at interfaces
Solution Approach 1:
The intermediate layer serves as an optical bridge between materials of different refractive indices, enabling high refractive index materials to be used for light extraction while the intermediate layer prevents excessive total internal reflection by providing a gradual index transition.
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 design effectively reduces total light reflection and enhances light-emitting efficiency by optimizing the refractive index gradient and incorporating a mirror layer for improved light escape and scattering, leading to increased light output.
Implementation Method 1
The intermediate layer has a refractive index between the refractive index of the substrate and the refractive index of the first semiconductor window layer
Implementation Method 2
how to improve the light-emitting efficiency of the light-emitting device is still an important issue in this art
Implementation Method 3
incorporating a mirror layer for improved light escape and scattering
Data Source
AI summary
This disclosure discloses a light-emitting device. The light-emitting device comprises: a substrate; an intermediate layer formed on the substrate; a transparent bonding layer; a first semiconductor window layer bonded to the semiconductor layer through the transparent bonding layer; and a light-emitting stack formed on the first semiconductor window layer. The intermediate layer has a refractive index between the refractive index of the substrate and the refractive index of the first semiconductor window layer.