Light Emitting Element Electrode Positioning
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Solution Overview
Problem
Existing light emitting elements suffer from reduced light extraction efficiency due to excessive light absorption by the electrode layer when it is formed around the reflective film, as the electrode comes into contact with the light transmissive conductive film.
Innovation Solution
A light emitting element design featuring a semiconductor stack with a dielectric multilayer light reflecting layer, a light transmissive insulating layer, and a light transmissive conducting layer, where the electrode is positioned inside the light reflecting layer's edge, reducing absorption and enhancing light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode is formed around the periphery of the reflective film to be in contact with the light transmissive conductive film, then the electrical connection is improved, but the light extraction efficiency is reduced due to light absorption by the electrode layer
Solution Approach 1:
The patent introduces a light transmissive insulating layer as an intermediary between the electrode and the light transmissive conductive film. This insulating layer allows electrical connection to be maintained while preventing direct contact that would cause light absorption, thus resolving the contradiction between electrical connection reliability and light extraction efficiency
Solution Approach 2:
The patent positions the electrode in a different spatial arrangement by placing it on the light transmissive insulating layer rather than directly on the conductive film, and by positioning its outer edge inside the outer edge of the reflective film. This dimensional repositioning reduces light absorption while maintaining electrical functionality
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 effectively reflects light away from the electrode, increases light transmission through the insulating layer, and enhances light extraction efficiency, allowing more light to be emitted externally.
Implementation Method 1
a light reflecting layer, in which a dielectric multilayer film is included, on an upper surface of the semiconductor stack
Data Source
AI summary
A light emitting element includes: a semiconductor stack; a light reflecting layer, in which a dielectric multilayer film is included, on an upper surface of the semiconductor stack; a light transmissive insulating layer that covers the light reflecting layer and is provided on the upper surface of the semiconductor stack around the periphery of the light reflecting layer; a light transmissive conducting layer that covers the light transmissive insulating layer and is provided on the upper surface of the semiconductor stack around the periphery of the light transmissive insulating layer; and an electrode that is provided on an upper surface of the light transmissive conducting layer so that the outer edge of the electrode coincides with an outer edge of the light reflecting layer or the outer edge of the electrode is positioned at inside of the outer edge of the light reflecting layer, as seen from an upper surface side.