Light-Emitting Device Reflective Electrode with Dielectric Pattern
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Solution Overview
Problem
Existing light-emitting devices face challenges in achieving high light extraction efficiency due to limitations in reflective electrode layer design, particularly as device sizes decrease, leading to reduced reflectance and light output efficiency.
Innovation Solution
The implementation of a light-emitting device structure that includes a transmissive conductive layer and dielectric layers with specific patterns and configurations, allowing for total reflection and improved light extraction efficiency through the use of a reflective electrode layer with a dielectric layer inserted between semiconductor layers, enhancing reflectance and light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reflective electrode layer is formed directly on the light-emitting structure, then light extraction efficiency is improved, but device size reduction leads to reduced reflectance and light output efficiency
Solution Approach 1:
The reflective electrode layer is segmented into multiple separate reflective regions that are spatially distributed across the device. Each reflective region is positioned to reflect light from specific light-emitting structures, allowing the system to maintain high reflectance in miniaturized configurations by optimizing the placement and size of individual reflective segments rather than relying on a single large continuous layer.
2Volume of moving object
If device size is reduced, then integration density is improved, but reflectance of the reflective electrode layer decreases
Solution Approach 1:
Different regions of the device are assigned different functional qualities - light-emitting structures are positioned in specific locations with corresponding reflective regions optimized for their local light emission characteristics. The reflective electrode layer is configured with varying reflectance properties in different local areas to maintain overall light output efficiency despite device miniaturization.
Solution Approach 2:
The reflective electrode layer is configured in a three-dimensional arrangement with varying heights and positions relative to the light-emitting structures. By utilizing vertical dimensionality and spatial positioning in addition to horizontal area, the system maintains effective reflectance coverage even when the overall device footprint is reduced.
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
This configuration significantly increases light extraction efficiency by optimizing reflectance and reducing light absorption, resulting in improved luminous output and reliability of light-emitting devices.
Implementation Method 1
a dielectric layer inserted between a light-emitting structure and the reflective electrode layer. The dielectric layer may have a specific refractive index to achieve total reflection
Implementation Method 2
a reflective electrode layer to improve extraction efficiency of light emitted from the light-emitting structure
Data Source
AI summary
Provided is a light-emitting device including: a substrate; a light-emitting structure formed on the substrate; a first transmissive conductive layer on the light-emitting structure; a first dielectric pattern layer formed on the first transmissive conductive layer, the first dielectric pattern layer including a plurality of openings; a second transmissive conductive layer conformally formed on the first transmissive conductive layer exposed through the plurality of openings and on the first dielectric pattern layer; a second dielectric pattern layer filling the plurality of openings; and a reflective electrode layer formed on the second transmissive conductive layer and the second dielectric pattern layer.