Light Emitting Element Through-Portion Electrode Design
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Solution Overview
Problem
Existing light emitting elements, such as those described in JP H10-275934 A, suffer from low light extracting efficiency due to light absorption by the p-side pad portion and semiconductor portion, which limits the overall performance of the device.
Innovation Solution
A light emitting element design featuring a semiconductor portion with a first through portion that penetrates through both n-type and p-type semiconductor layers, where the p-side electrode includes a p-side light-transmissive member extending from the p-type semiconductor layer to the substrate, and a p-side pad portion is connected to this member at the bottom of the through portion, allowing light to be extracted efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the p-side pad portion is provided above the p-type semiconductor layer, then electrical connection is achieved, but light extracting efficiency deteriorates due to light absorption by the p-side pad portion and semiconductor portion
Solution Approach 1:
The p-side electrode is divided into two functional parts: a p-side light-transmissive member that allows light to pass through, and a p-side pad portion that provides electrical connection. This segmentation enables each part to perform its specific function without interfering with the other, resolving the contradiction between electrical connection and light extraction efficiency
Solution Approach 2:
The p-side light-transmissive member extends in the thickness direction (vertical dimension) from the p-type semiconductor layer toward the light-emitting surface, creating a three-dimensional structure that allows light to travel through the electrode in the thickness direction while maintaining electrical connection 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 design significantly improves light extracting efficiency by preventing light absorption by the semiconductor and p-side pad portions, enhancing the overall light output of the light emitting element.
Implementation Method 1
a p-side light-transmissive member that is arranged from above the p-type semiconductor layer to above the substrate in the first through portion
Data Source
AI summary
A light emitting element includes an insulating substrate; a semiconductor portion disposed on the substrate, the semiconductor portion having an n-type semiconductor layer and a p-type semiconductor layer in order from a substrate side; an n-side electrode electrically connected to the n-type semiconductor layer; and a p-side electrode electrically connected to the p-type semiconductor layer. The semiconductor portion includes a first through portion defined by a first inner surface formed at the semiconductor portion, the first through portion penetrating through the n-type semiconductor layer and the p-type semiconductor layer to expose the substrate. The p-side electrode includes: a p-side light-transmissive member that is connected to the p-type semiconductor layer and extends above the substrate in the first through portion, and a p-side pad portion that is disposed in the first through portion and that is connected to the p-side light-transmissive member above the substrate in the first through portion.