Optoelectronic Device Photonic Crystal Light Redirection
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Solution Overview
Problem
Existing optoelectronic devices with light-emitting sources and photoluminescent blocks face issues such as low luminous efficacy due to unconverted radiation, high manufacturing costs, and increased re-absorption of converted radiation, which limits their efficiency and scalability.
Innovation Solution
The use of photonic crystals and selective mirrors in conjunction with photoluminescent blocks to optimize radiation conversion and propagation, along with optical couplers that redirect radiation to enhance conversion efficiency and reduce re-absorption, while maintaining compact dimensions and low manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the photoluminescent block is increased to increase the proportion of first radiation converted into second radiation, then the conversion proportion is improved, but the re-absorption of second radiation in the photoluminescent block increases and the luminous efficacy decreases
Solution Approach 1:
The patent introduces a photonic crystal structure that manipulates light propagation in three-dimensional space, redirecting rays at multiple angles and lengths without simply increasing the linear thickness of the photoluminescent block. This dimensional approach to light control allows enhanced conversion while maintaining thin overall structure.
Solution Approach 2:
The photonic crystal acts as an intermediary structure between the light-emitting source and the photoluminescent block, modifying the propagation direction of incoming rays and enhancing their interaction with the photoluminescent material without requiring increased block thickness.
2Quantity of substance
If the thickness of the photoluminescent block is increased to increase the proportion of first radiation converted into second radiation, then the conversion proportion is improved, but the dimensions of the photoluminescent block increase
Solution Approach 1:
The photonic crystal structure enables enhanced light-matter interaction through three-dimensional ray redirection and multiple internal reflections, achieving high conversion proportions without increasing the linear thickness of the photoluminescent block.
Solution Approach 2:
The photonic crystal structure contains periodic porous or lattice patterns that manipulate light propagation paths, allowing increased interaction length for conversion while maintaining a compact external dimension through the periodic internal structure.
3Illumination intensity
If photoluminescent blocks are used to convert radiation, then the desired wavelength radiation is produced, but part of the emitted radiation is not converted and must be blocked by a filter, increasing device complexity
Solution Approach 1:
The patent extracts and removes the filter component from the device structure by achieving sufficiently high conversion proportions through the photonic crystal-enhanced photoluminescent block, eliminating the need for additional filtering elements.
Solution Approach 2:
The photonic crystal structure changes the propagation direction and path length parameters of incoming radiation, enhancing the conversion efficiency of the photoluminescent block to a level where unconverted radiation becomes negligible and filtering is unnecessary.
4Quantity of substance
If the proportion of first radiation converted is increased by increasing photoluminescent block thickness, then conversion efficiency is improved, but the manufacturing cost increases
Solution Approach 1:
The photonic crystal structure achieves enhanced conversion efficiency through three-dimensional light path manipulation rather than simply increasing material quantity, reducing the amount of expensive photoluminescent material needed while maintaining high conversion proportions.
Solution Approach 2:
The periodic porous structure of the photonic crystal allows enhanced light interaction within a reduced material volume, decreasing the quantity of expensive photoluminescent block material required while maintaining or improving conversion 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
This approach increases the proportion of radiation converted by photoluminescent blocks, enhances luminous efficacy, and allows for the production of optoelectronic devices at an industrial scale with reduced dimensions and lower costs.
Implementation Method 1
first photo-luminescent blocks capable of converting by optical pumping the first radiation into a second radiation at a second wavelength
Implementation Method 2
photoluminescent blocks distributed into first photo-luminescent blocks capable of converting by optical pumping the first radiation into a second radiation at a second wavelength
Data Source
AI summary
An optoelectronic device, including: light-emitting sources, each light-emitting source being capable of emitting a first radiation at a first wavelength; photoluminescent blocks distributed into first photo-luminescent blocks capable of converting by optical pumping the first radiation into a second radiation at a second wavelength and second photoluminescent blocks capable of converting by optical pumping the first radiation into a third radiation at a third wavelength; and for each photoluminescent block, an optical coupler including a first photonic crystal at least partially surrounding the photoluminescent block and covering, with the photo-luminescent block, one of the light-emitting sources next to the photoluminescent block, the optical coupler being capable of modifying the propagation direction of rays of the first radiation emitted by the light-emitting source to redirect the rays towards the photoluminescent block.