Axial 3D LED Photonic Crystal Cladding for Wavelength Control
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Solution Overview
Problem
Optoelectronic devices with axial-type three-dimensional LEDs face challenges in achieving desired radiation emission properties and crystal quality, as the average diameter of LEDs for optimal radiation emission differs from that required for forming a photonic crystal with desired properties.
Innovation Solution
The optoelectronic device incorporates a stack of semiconductor layers with a cladding structure, where each LED has a transparent insulating cladding with a thickness greater than 10 nm and a layer of a different electrically insulating material, forming a photonic crystal that enhances radiation emission by creating a resonant cavity, allowing for improved optical properties and crystal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the average LED diameter is increased to optimize radiation emission at desired wavelength, then the radiation emission properties are improved, but the crystalline quality of the active area deteriorates
Solution Approach 1:
The invention separates the LED structure into two distinct diameter components: the active area diameter (controlling crystalline quality) and the cladding outer diameter (controlling radiation emission properties). This segmentation allows independent optimization of both parameters without compromise.
Solution Approach 2:
The transparent cladding structure acts as an intermediary element that modifies the radiation emission properties without affecting the active area crystalline quality. The cladding's outer diameter serves as the mediating parameter that determines photonic crystal properties while the active area maintains its optimal smaller diameter for high crystalline quality.
2Manufacturing precision
If the average LED diameter is decreased to maintain good crystal quality, then the crystalline quality is improved, but the radiation emission wavelength and spectrum properties become suboptimal
Solution Approach 1:
The invention divides the LED diameter into two functional segments: the active area diameter optimized for crystalline quality and the cladding outer diameter optimized for radiation emission wavelength. This enables the active area to remain small for high crystalline quality while the cladding provides the larger effective diameter needed for desired optical properties.
Solution Approach 2:
The cladding structure serves as an intermediary that translates the small active area diameter into an effective larger optical diameter. The cladding's outer diameter determines the photonic crystal properties and radiation emission wavelength, while the active area maintains its small size for optimal crystalline quality.
3Illumination intensity
If the LED diameter is optimized for radiation emission, then the emission spectrum properties are improved, but the photonic crystal formation with desired properties becomes difficult
Solution Approach 1:
The invention segments the diameter parameters into two independent variables: active area diameter and cladding outer diameter. This allows the cladding diameter to be specifically optimized for photonic crystal formation while the active area diameter is optimized for emission spectrum properties, simplifying the overall design process.
Solution Approach 2:
The cladding structure acts as an intermediary that enables photonic crystal formation with desired properties independent of the active area dimensions. By controlling the cladding outer diameter and pitch, the photonic crystal properties can be optimized separately from the emission spectrum properties determined by the active area.
4Device complexity
If a single diameter is used for both active area and cladding, then the design is simplified, but it becomes impossible to simultaneously achieve optimal radiation emission and photonic crystal properties
Solution Approach 1:
The invention divides the diameter parameter into two independent segments: active area diameter and cladding outer diameter. This segmentation transforms a single constrained parameter into two independent parameters, allowing simultaneous optimization of multiple properties without increasing fundamental design complexity.
Solution Approach 2:
The cladding structure serves as an intermediary layer that decouples the design constraints. By introducing this intermediate structure with its own independent diameter parameter, the system can simultaneously achieve optimal radiation emission properties (via cladding diameter) and photonic crystal properties (via pitch and cladding outer diameter) without compromising design feasibility.
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 amplifies the intensity of radiation emitted at specific wavelengths, narrows the emission spectrum, and simplifies the design of the photonic crystal by dissociating its properties from the LED dimensions, achieving efficient and targeted radiation emission.
Implementation Method 1
The LEDs can be arranged in an LED array so as to form a photonic crystal. In particular, the photonic crystal makes it possible to obtain a light beam emitted by the LED array along a preferred direction. The photonic crystal also makes it possible to filter the wavelength of the radiation emitted by the LED array
Implementation Method 2
The properties of the photonic crystal are advantageously chosen so that the array of coated LEDs forms a resonant cavity, in particular to achieve a coupling and increase the selection effect. This allows the intensity of the radiation emitted by the set of cladded LEDs of the array by the emission surface of the optoelectronic device to be amplified for certain wavelengths
Implementation Method 3
each cladding having a thickness greater than 10 nm. The device further comprises a layer between the claddings, transparent to said radiation of a second material, different from the first material, the second material being electrically insulating
Data Source
AI summary
An optoelectronic device including an array of axial light-emitting diodes (LED), each including an active area configured to emit electromagnetic radiation whose emission spectrum includes a maximum at a first wavelength. The device further includes a cladding for each LED, transparent to said radiation of a first material surrounding the sidewalls of the LED over at least a portion of the LED, each cladding having a thickness greater than 10 nm. The device further comprises layer, between the claddings, transparent to said radiation, made of a second material different from the first material, the second material being electrically insulating, the array forming a photonic crystal.