Semiconductor Light-Emitting Device Electrode Layout
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Solution Overview
Problem
Existing semiconductor light-emitting devices face challenges in optimizing electrode profiles and layouts to enhance electrical characteristics and luminous efficiency while preventing light interference and leakage, which affects the overall light output and color uniformity.
Innovation Solution
The semiconductor light-emitting device incorporates a p-side electrode and an n-side electrode with specific interconnection portions and a supporting body, including metal pillars and a resin layer, to ensure efficient light extraction and distribution, with a fluorescent material layer enhancing optical characteristics and reducing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electrodes are formed on one side of the semiconductor layer, then electrode profile and layout freedom is improved, but light interference and leakage may occur affecting light output and color uniformity
Solution Approach 1:
The electrode structure is segmented into multiple functional parts: a reflective electrode layer, an insulating layer with openings, and transparent conductive layers. This segmentation allows different regions to serve different purposes - reflection, insulation, and light transmission - thereby maintaining electrode functionality while preventing light interference and leakage.
Solution Approach 2:
An insulating layer is introduced as an intermediary between the reflective electrode and the light-emitting layer. This intermediary layer with controlled openings prevents direct light interference with the electrode while still allowing necessary electrical connections, thus resolving the conflict between electrode adaptability and light leakage prevention.
2Productivity
If complex interconnection structures are added to prevent light leakage, then light extraction efficiency is improved, but device complexity increases
Solution Approach 1:
The insulating layer serves multiple functions simultaneously: it provides electrical insulation, controls light extraction through opening patterns, and supports the transparent conductive layers. This multi-functionality improves light extraction efficiency without proportionally increasing device complexity.
Solution Approach 2:
The insulating layer features local variations in thickness and opening patterns tailored to specific regions. Areas requiring high light extraction have optimized opening configurations, while other areas provide structural support or insulation. This localized optimization achieves high light extraction efficiency without uniformly increasing complexity throughout the entire device.
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 increases light output, improves uniform current distribution, and prevents color breakup by effectively directing light to the fluorescent material layer, resulting in enhanced light extraction efficiency and reliability.
Implementation Method 1
a fluorescent material layer enhancing optical characteristics
Implementation Method 2
The second portion is provided in the first n-side region and contacting the first n-side region
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3C
AI summary
According to one embodiment, the p-side electrode (16) is provided on the second semiconductor layer. The insulating film (18) is provided on the p-side electrode. The n-side electrode (17) includes a first portion (17a), a second portion (17c), and a third portion (17e). The first portion is provided on a side face of the first semiconductor layer. The second portion is provided in the first n-side region. The third portion overlaps the p-side electrode via the insulating film and connects the first portion and the second portion to each other.