Transparent Dielectric Barrier in Light-Emitting Devices
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Solution Overview
Problem
Conventional light-emitting devices experience reduced brightness efficiency due to thermal reactions between the ohmic contact layer and the low refractive index layer, and light absorption at the ohmic metal contact points, which affect electrical and lighting performance.
Innovation Solution
Incorporating a transparent dielectric barrier layer between the metal reflective layer and the first transparent conductive oxide layer, eliminating light-absorbing materials and preventing thermal reactions, while ensuring electrical conduction through through-holes in the barrier layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ohmic contact layer and low refractive index layer are used in the conventional light-emitting device, then electrical conduction is improved, but thermal reactions occur between the layers during manufacturing which reduces brightness efficiency
Solution Approach 1:
A transparent dielectric barrier layer is introduced between the metal reflective layer and the first transparent conductive oxide layer to prevent thermal reactions during manufacturing. This barrier layer acts as an intermediary that physically separates the two layers, preventing harmful thermal interactions while maintaining electrical conduction through through-holes.
2Reliability
If ohmic metal contact points are added to improve electrical performance, then electrical conduction is enhanced, but light absorption occurs at these contact points which reduces lighting efficiency
Solution Approach 1:
The transparent dielectric barrier layer serves as an intermediary that prevents direct contact between metal layers and conductive oxide layers, eliminating light absorption at contact points. The through-holes in the barrier layer provide electrical conduction paths without requiring metal-to-oxide contact, thus maintaining electrical performance while preventing light absorption.
3Object-generated harmful factors
If a transparent dielectric barrier layer is introduced to prevent thermal reactions, then brightness efficiency is improved, but electrical conduction may be affected
Solution Approach 1:
The transparent dielectric barrier layer is designed with through-holes that allow electrical conduction while maintaining the barrier function. These porous structures enable charge carriers to pass through the barrier layer, ensuring electrical conduction is not compromised while the solid portions of the barrier continue to prevent thermal reactions between layers.
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
Enhances brightness and electrical performance by preventing thermal reactions and reducing light absorption, leading to improved efficiency and reliability of the light-emitting device.
Implementation Method 1
a transparent dielectric barrier layer disposed between a first transparent conductive oxide layer and a second transparent conductive oxide layer
Implementation Method 2
ensuring electrical conduction through through-holes in the barrier layer
Implementation Method 3
there is no light absorbing material between the metal reflective layer and the first transparent conductive oxide layer
Data Source
AI summary
The present application is to provide a light-emitting device comprising a metal reflective layer; a first transparent conductive oxide layer having a first refractive index; a second transparent conductive oxide layer having a second refractive index different from the first refractive index, and being between the metal reflective layer and the first transparent conductive oxide layer; and a light-emitting stack layer electrically connected to the second transparent conductive oxide layer substantially through the first transparent conductive layer; wherein there is no light absorbing material between the metal reflective layer and the first transparent conductive oxide layer.