Light Emitting Element Ion Trapping Layer
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Solution Overview
Problem
Existing light emitting elements face challenges in maintaining high light output over long operation times due to crystal defects and ion intrusion when using dry etching methods for forming fine concave-convex structures, which degrade light extraction efficiency.
Innovation Solution
A light emitting element design incorporating a high concentration second layer between the current spreading layer and the cladding layer, with concave-convex structures formed using dry etching, where the second layer has a higher impurity concentration to trap ions and prevent them from reaching the light emitting layer, thereby reducing crystal defects and maintaining high light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a dry etching method is used to form fine concave-convex structures, then light extraction efficiency is improved and light output is increased, but crystal defects are caused and ion species intrude into the light emitting layer, degrading light output during long operation time
Solution Approach 1:
A protective layer is introduced as an intermediary between the current spreading layer and the light emitting layer. This protective layer serves as a barrier that prevents ion species from the current spreading layer from intruding into the light emitting layer, thereby maintaining light output stability during long operation while allowing the dry etching method to be used for forming fine concave-convex structures on the current spreading layer surface
2Illumination intensity
If fine concave-convex structures are formed on the current spreading layer surface, then light extraction efficiency is improved, but crystal defects are easily caused in the processed area
Solution Approach 1:
The protective layer acts as a mediator that allows the formation of fine concave-convex structures on the current spreading layer surface through dry etching while preventing crystal defects from propagating into the light emitting layer. The protective layer absorbs the mechanical stress and ion damage caused by the etching process, preserving the crystal quality of the light emitting layer
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 solution effectively traps ions and reduces crystal defects, ensuring high light output and reliability during extended operation, suitable for applications in illumination apparatuses and display devices.
Implementation Method 1
the second layer has a higher impurity concentration to trap ions and prevent them from reaching the light emitting layer
Data Source
AI summary
According to one embodiment, a light emitting element includes a light emitting layer, a cladding layer, a current spreading layer, a second layer, and an electrode. The light emitting layer is capable of emitting emission light. The current spreading layer includes a surface processed layer and a first layer. The surface processed layer has a surface including convex portions and bottom portions provided adjacent to the convex portions. The first layer is provided between the surface processed layer and the cladding layer. The second layer is provided between the surface processed layer and the cladding layer and includes a region having an impurity concentration higher than an impurity concentration of the current spreading layer. The electrode is provided in a region of the surface of the surface processed layer where the convex portions and the bottom portions are not provided.