Nanorod LED Structure With Porous Layer for Light Extraction
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Solution Overview
Problem
Miniaturization of light emitting diodes (LEDs) to micro or nano units results in decreased luminous efficiency.
Innovation Solution
A nanorod light emitting device with a nano-scale diameter is developed, featuring a substrate structure with a porous semiconductor layer, a buffer layer, and a passivation film. The device includes a semiconductor light emitting structure with a nanorod shape, a first semiconductor layer doped with an impurity, a multi-quantum well light emitting layer, a second semiconductor layer with opposite conductivity type, and an electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If LEDs are miniaturized to micro or nano units, then the size of the LED is reduced, but the luminous efficiency of the LED is lowered
Solution Approach 1:
The LED structure is segmented into multiple functional layers including a porous semiconductor layer with voids, a superlattice layer with alternating high and low bandgap materials, and a nanorod-shaped light emitting structure. This segmentation allows each layer to perform its specific function optimally, maintaining high luminous efficiency in the miniaturized device
Solution Approach 2:
A porous semiconductor layer with controlled voids is introduced in the LED structure. The porous structure increases the surface area and improves light extraction efficiency while maintaining the compact nanoscale dimensions of the device, thereby preserving luminous efficiency despite miniaturization
Solution Approach 3:
The LED employs composite material structures including the superlattice layer composed of alternating InGaN and GaN layers with different bandgaps, and the combination of porous semiconductor material with nanorod structures. These composite materials enable optimized optical and electrical properties that maintain high efficiency in the miniaturized 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
The nanorod light emitting device achieves improved luminous efficiency while maintaining a nano-scale diameter, effectively addressing the efficiency loss encountered in miniaturized LEDs.
Implementation Method 1
a porous semiconductor layer disposed on the buffer layer, the porous semiconductor layer having a plurality of voids
Implementation Method 2
a passivation film disposed on a side wall of each of the plurality of semiconductor light emitting structures, the passivation film having an insulation property
Implementation Method 3
a first semiconductor layer disposed on the porous semiconductor layer and doped with an impurity of a first conductivity type, a second semiconductor layer disposed on the light emitting layer and doped with an impurity of a second conductivity type
Data Source
AI summary
Provided is a substrate structure including a substrate, a buffer layer disposed on the substrate, a porous semiconductor layer disposed on the buffer layer, the porous semiconductor layer having a plurality of voids, a plurality of semiconductor light emitting structures disposed on the porous semiconductor layer, the plurality of semiconductor light emitting structures having a nanorod shape extending vertically, and a passivation film disposed on a side wall of each of the plurality of semiconductor light emitting structures, the passivation film having an insulation property.