Transparent Electrode Protrusions for Light Extraction
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Solution Overview
Problem
Existing nitride semiconductor light emitting diodes face issues with non-uniform current injection, low heat emission efficiency, and low light extraction efficiency, which hinder their use as high-efficiency light sources, and existing methods for improving light extraction often damage the surface or are difficult to control.
Innovation Solution
A light emitting diode with a transparent electrode layer featuring protrusions formed using a hydrothermal synthesis method, where the protrusions have different gradients on their sides, preventing surface damage and allowing for controlled formation without dry or wet etching, thereby enhancing light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dry or wet etching methods are used to form protrusions, then light extraction efficiency is improved, but the surface of the light emitting diode is damaged
Solution Approach 1:
The patent changes the manufacturing method from chemical etching (dry or wet) to hydrothermal synthesis, altering the process parameters and mechanism. This involves using aqueous solutions with metal salts under controlled temperature and pressure conditions to grow protrusions, thereby avoiding surface damage while maintaining manufacturing feasibility
Solution Approach 2:
The patent replaces the mechanical/chemical removal process (etching) with a growth process (hydrothermal synthesis). Instead of removing material to create protrusions, the method uses chemical deposition to grow protrusions directly on the surface, substituting a destructive mechanism with a constructive one
2Manufacturing precision
If conventional protrusion formation methods are used, then light extraction is improved, but control over protrusion formation is difficult
Solution Approach 1:
The hydrothermal synthesis method allows for controlled growth where parameters such as solution composition, temperature, and time can be adjusted to achieve desired protrusion characteristics. This provides feedback control over the formation process, enabling precise manipulation of protrusion size, shape, and distribution while maintaining high light extraction efficiency
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 improves light extraction efficiency by scattering light through the protrusions in the transparent electrode layer, preventing surface damage, and simplifying the manufacturing process, making it more economical and controlled.
Implementation Method 1
The solution effectively improves light extraction efficiency by scattering light through the protrusions in the transparent electrode layer
Implementation Method 2
forming a plurality of protrusions by re-growing the seed layer, wherein the plurality of protrusions each have a lower portion and an upper portion
Data Source
AI summary
Disclosed herein are a light emitting diode including a plurality of protrusions including zinc oxide and a method for manufacturing the same. According to an exemplary embodiment of the present disclosure, the light emitting diode includes: a substrate; a nitride light emitting structure disposed on the substrate; and a transparent electrode layer disposed on the nitride light emitting structure, wherein the transparent electrode layer includes a plurality of protrusions, the plurality of protrusions each have a lower portion and an upper portion, and a side of the lower portion and a side of the upper portion have different gradients.