LED Light-Emitting Device with Segmented Reflective Layer for Brightness and Adhesion
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Solution Overview
Problem
Current light-emitting diodes (LEDs) face challenges in achieving enhanced brightness and adhesion force between the electrode and reflective layers, which limits their application in various lighting applications.
Innovation Solution
A light-emitting device structure is developed with a conductive support substrate, a reflective layer, a first electrode layer with a step, a protective layer, and a light-emitting structure including conductive semiconductor layers and an active layer, where the reflective and electrode layers overlap vertically, and a method for fabricating this structure that includes simultaneous baking and etching to improve adhesion and reflectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the reflective layer area is increased to enhance brightness, then the luminous efficiency is improved, but the adhesion force between the electrode layer and reflective layer deteriorates
Solution Approach 1:
The reflective layer is divided into two distinct regions: a first reflective layer region that overlaps with the electrode layer and a second reflective layer region that does not overlap. This segmentation allows the first region to provide strong adhesion through overlap while the second region provides additional reflective area for enhanced brightness, resolving the contradiction between adhesion strength and luminous efficiency.
2Strength
If the electrode layer width is increased to improve adhesion, then the adhesion force is enhanced, but the manufacturing precision deteriorates due to difficulty in controlling width uniformity
Solution Approach 1:
The reflective layer is segmented into regions with different widths relative to the electrode layer. The first reflective layer region has a width that provides sufficient overlap for adhesion, while the second reflective layer region extends beyond the electrode layer to increase total reflective area. This segmentation allows each region to be optimized independently, maintaining manufacturing precision while achieving both adhesion and brightness goals.
Data Source
AI summary
Disclosed is a light-emitting device including a conductive support substrate, a reflective layer arranged on the conductive support substrate, a first electrode layer arranged on the reflective layer and provided with a step in at least one region of the edge thereof, a protective layer arranged on the step, and a light-emitting structure arranged on the first electrode layer and the protective layer, the light-emitting structure including a first conductive semiconductor layer, a second conductive semiconductor layer and an active layer interposed between the first conductive semiconductor layer and the second conductive semiconductor layer, wherein at least one region of the reflective layer and the first electrode layer vertically overlaps the protective layer. Based on this configuration, the light-emitting device can exhibit improved adhesion between the electrode layer and the reflective layer and be provided with a wider reflective layer, thus improving brightness.