Dye-Zeolite Luminescence Concentrators for Stable Light Trapping
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Solution Overview
Problem
Current luminescence concentrators face limitations such as light loss due to total internal reflection, self-absorption, thick chromophore layers, stability issues, and difficulty in constructing structured materials with different refractive indices, which affect efficiency, lifespan, and flexibility, particularly in achieving uniform light distribution for applications like LCD backlighting.
Innovation Solution
The development of a luminescence concentrator and dispersant using dye-zeolite materials with organized dye molecules and zeolite crystals embedded in a polymer, allowing for controlled nonradiative energy transfer and suppression of light scattering, enabling efficient light concentration and uniform emission through a transparent structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dyes are dissolved in a polymer matrix to create luminescence concentrators, then the device can achieve light concentration through total internal reflection, but the dyes are exposed to plasticizers and reactive species causing stability issues and potential migration
Solution Approach 1:
Zeolite crystals serve as an intermediary host matrix that encapsulates the dye molecules. The zeolite framework provides a protective environment that isolates dyes from harmful plasticizers and reactive species in the polymer matrix, while still allowing the dye to maintain its luminescence properties. This mediator approach resolves the contradiction by introducing a protective barrier between the dye and harmful external factors.
Solution Approach 2:
The invention creates a composite material system consisting of dye-loaded zeolite crystals embedded in a polymer matrix. The zeolite-dye composite provides both structural stability and optical functionality, combining the advantages of inorganic zeolite (protection, stability) with organic polymer (processability, flexibility). This composite approach enables long-term stability while maintaining the luminescence concentrator functionality.
2Use of energy by moving object
If chromophores are distributed in a thick layer of several millimeters, then sufficient light absorption can be achieved, but the optical properties are significantly limited and structured construction with materials of different refractive index becomes impossible
Solution Approach 1:
The invention changes the concentration parameter of chromophores from millimeter-scale distribution to nanometer-scale distribution within zeolite crystals. By loading dyes into the nanochannels of zeolite, the effective chromophore density is dramatically increased, enabling sufficient light absorption in much thinner layers. This parameter change from macroscopic to nanoscopic scale resolves the contradiction between absorption efficiency and structural flexibility.
Solution Approach 2:
Zeolite crystals with their characteristic porous nanochannel structure serve as the host matrix for dye molecules. The porous structure provides high surface area and numerous binding sites for chromophores, enabling efficient light absorption in thin films. The nanoscale porosity allows dense packing of chromophores without requiring thick layers, thus enabling both high absorption efficiency and structural complexity with different refractive indices.
3Ease of manufacture
If dyes are dissolved in polymer matrices to achieve flexibility in construction, then ease of manufacture is improved, but the dyes can migrate during temperature fluctuations reducing reliability
Solution Approach 1:
The invention applies local quality by confining dye molecules to specific locations within the zeolite crystal structure. Instead of uniform distribution in the polymer matrix, dyes are localized in the nanochannels of zeolite crystals. This localized confinement prevents migration while maintaining flexibility in overall device construction, as the zeolite-dye composite can still be processed and shaped like traditional polymer-based systems.
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 solution enhances the efficiency, stability, and flexibility of luminescence concentrators and dispersants, enabling them to be suitable for commercial use and expanding their applications by overcoming previous limitations, including improved light distribution and extended lifespan.
Implementation Method 1
A luminescence concentrator, which we will abbreviate to LK in the following, is a device that can concentrate both incident direct and diffuse light by frequency shift and total internal reflection
Implementation Method 2
spreads it uniformly over a transparent body by means of luminescence emission radiates diffusely or directionally over a surface
Implementation Method 3
is a device that traps both directional and non-directional incident light in a transparent body (e.g. glass or plastic) by frequency shift and total internal reflection
Data Source
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AI summary
A luminescence concentrator (LK) may concentrate both incident direct and diffuse light by way of frequency shift and total internal reflection. It differs fundamentally from geometric concentrators. With sufficient geometric expansion of the collector plate, nearly arbitrarily high concentration can be achieved in the LK. A luminescence disperser is an apparatus which holds both directional and nondirectional incident light captive in a transparent body by way of frequency shift and total internal reflection and emits it diffusely or directionally uniformly distributed across an area by way of luminescence emission. The object of the invention is a method for the technical implementation of the LK and luminescence disperser, using zeolite crystals having a nanotube structure, into which the luminescent dyes are embedded such that they have antenna properties. Using the resulting novel structures, problems can be solved which made the technical use of LK impossible or at least considerably limited it. This results in completely novel usage possibilities for collecting and concentrating sun light and feeding it into photovoltaic systems, for converting it into electric and thermal energy in combined photovoltaic/hot water apparatuses, and for feeding it into fiber optic apparatuses. Other uses relate to scintillation detectors, luminescence dispersers for signaling equipment, fluorescent lettering, room luminaires, and background lighting, and to the locally directed emission for the production of three-dimensional impressions of images and ophthalmology.