Axial 3D LED Photonic Crystal for Red Emission Without Phosphors
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Solution Overview
Problem
Existing optoelectronic devices with axial-type three-dimensional light-emitting diodes based on III-V or II-VI compounds face challenges in achieving a narrow-spectrum electromagnetic radiation, as high indium content leads to lattice parameter differences causing defects and reducing quantum efficiency, and the use of photoluminescent materials is costly and inefficient.
Innovation Solution
The optoelectronic device employs an array of axial light-emitting diodes with a stack of III-V or II-VI compound semiconductor materials, forming a photonic crystal that amplifies electromagnetic radiation at specific wavelengths, allowing for the emission of red light without photoluminescent materials and enabling modification of emission frequencies post-manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the atomic percentage of indium is increased to achieve longer wavelength emission, then the emission wavelength increases, but lattice parameter differences cause dislocations and quantum efficiency decreases
Solution Approach 1:
The patent changes the structural parameters of the active area by transitioning from planar to three-dimensional nanowire configurations, and from single quantum wells to multiple quantum wells with varying compositions. This allows achieving longer wavelengths through structural design rather than solely relying on high indium content, thereby maintaining quantum efficiency while extending emission wavelength into the red region.
Solution Approach 2:
The patent employs composite material structures by combining multiple quantum wells with different indium compositions within a single nanowire active area. This composite approach allows each quantum well to contribute differently to the overall emission, achieving broad spectral coverage including red wavelengths while maintaining high quantum efficiency through optimized material composition gradients.
2Temperature
If photoluminescent materials are used to convert radiation to achieve red light emission, then red light emission is achieved, but the cost increases and conversion efficiency is low
Solution Approach 1:
The patent extracts and eliminates the photoluminescent conversion layer from the device structure, achieving red light emission directly from the LED active area through optimized multiple quantum well structures. This direct emission approach removes the intermediate conversion step, thereby eliminating the associated costs and efficiency losses while maintaining the desired red wavelength emission.
3Adaptability or versatility
If a single quantum well or multiple quantum wells with high indium content are used to achieve red emission, then the emission spectrum can cover red wavelengths, but the formation of non-radiative defects significantly decreases quantum efficiency
Solution Approach 1:
The patent segments the active area into multiple discrete quantum wells within three-dimensional nanowire structures, with each quantum well having optimized indium composition for specific wavelength ranges. This segmentation allows the overall device to achieve broad spectral coverage including red wavelengths while each individual quantum well maintains high quantum efficiency by avoiding excessive indium content that would cause defects.
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 achieves efficient emission of red light with improved quantum efficiency and the ability to modify emission spectra without photoluminescent materials, simplifying manufacturing and enhancing device performance.
Implementation Method 1
the array forming a photonic crystal configured to form three resonance peaks amplifying the intensity of said electromagnetic radiation at at least second, third, and fourth wavelengths
Implementation Method 2
forming a photonic crystal configured to form three resonance peaks amplifying the intensity of said electromagnetic radiation
Implementation Method 3
an active area configured to emit an electromagnetic radiation having an emission spectrum comprising a maximum at a first wavelength
Data Source
AI summary
An optoelectronic device including an array of axial light-emitting diodes. The light-emitting diodes each include an active area configured to emit an electromagnetic radiation having an emission spectrum including a maximum at a first wavelength. The array forms a photonic crystal configured to be able to form three resonance peaks amplifying the intensity of said electromagnetic radiation at at least second, third, and fourth wavelengths.