Fluorine-Diffused LED Structure for Current Spreading Under Pad Electrodes
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Solution Overview
Problem
Conventional light-emitting components suffer from concentrated current paths under the main pad electrode, leading to inefficient current distribution and potential electrode shading, which affects heat dissipation and luminous exitance.
Innovation Solution
The light-emitting component incorporates a fluorine-containing region formed by diffusing fluorine from an electrically insulating layer into the second semiconductor layer, creating a high resistance region that disperses current laterally and reduces concentration under the main pad electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the main pad electrode is used for current accumulation, then electrical connection is simplified, but current paths become concentrated leading to electrode shading and poor heat dissipation
Solution Approach 1:
The patent introduces a fluorine-containing region with high resistance specifically under the main pad electrode, creating local property variation in the second semiconductor layer. This localized high resistance region forces current to spread laterally rather than concentrating vertically, resolving the contradiction between simplified electrical connection and current distribution uniformity
Solution Approach 2:
The patent changes the electrical resistance parameter of the second semiconductor layer by introducing fluorine-containing regions. By controlling fluorine concentration and distribution, the resistance is increased in specific areas to modify current flow patterns, transforming the harmful current concentration into beneficial current spread
2Ease of manufacture
If conventional current path structure is used, then manufacturing is simple, but light dispersion and current spread are insufficient
Solution Approach 1:
The fluorine-containing region is formed in the second semiconductor layer before final electrode assembly. This preliminary modification of the semiconductor layer's electrical properties ensures that current spread is optimized before the device is completed, improving light emission efficiency without adding complex manufacturing steps
Solution Approach 2:
The fluorine-containing region acts as an intermediary element that mediates between the simple conventional structure and the desired current spread performance. It provides the necessary electrical property modification without requiring fundamental changes to the overall device architecture
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 solution enhances current spread and light dispersion, reducing electrode shading and improving the uniformity of light emission, while also facilitating better heat dissipation through more efficient current distribution.
Implementation Method 1
a fluorine-containing region is formed in the second semiconductor layer by diffusing fluorine from the electrically insulating layer into the second semiconductor layer through heating treatment
Data Source
AI summary
A light-emitting component includes a light-emitting unit and an electrically insulating layer. The light-emitting unit includes a first semiconductor layer, an active layer, and a second semiconductor layer, which are stacked on one another along a stacking direction in such order. The second semiconductor has a lower surface distal from the active layer. The electrically insulating layer is disposed to cover a first portion and to expose a second portion of the lower surface of the second semiconductor layer. A fluorine-containing region is formed in the second semiconductor layer. Methods for making the light-emitting component are also disclosed.