Organic Photon Energy Up-conversion Composition
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Solution Overview
Problem
Existing photon energy up-conversion systems, both inorganic and organic, face limitations such as high costs, restricted versatility in wavelength, inefficiency at low pump intensities, and requirement for low temperatures, making them unsuitable for large-area film formation and practical opto-electronic devices.
Innovation Solution
A composition comprising two organic components, where one acts as a sensitizer absorbing energy at a specific wavelength and the other as an emissive component emitting at a shorter wavelength, enabling efficient up-conversion at ambient temperatures and varying radiation conditions, with the possibility of sequential two-photon or multi-photon excitation and triplet-triplet annihilation processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic crystalline systems with rare earth ions are used for photon energy up-conversion, then up-conversion efficiency is improved, but manufacturing cost increases and suitability for large-area film preparation deteriorates
Solution Approach 1:
The patent replaces expensive inorganic crystalline systems with organic compounds that can be deposited at low costs over large areas. The organic sensitizer and emitter compounds enable up-conversion functionality without requiring costly rare earth ions or complex crystalline structures, making the system economically viable for large-area applications.
Solution Approach 2:
The patent changes the fundamental material parameters from inorganic crystalline structures to organic molecular compounds. This parameter change allows the system to maintain up-conversion efficiency while achieving low-cost manufacturing and flexibility for large-area film preparation, as organic compounds can be processed using conventional low-cost techniques.
2Ease of manufacture
If organic compounds with direct two-photon excitation are used, then manufacturing cost decreases, but up-conversion efficiency under ambient conditions deteriorates
Solution Approach 1:
The patent introduces an intermediary energy transfer mechanism where the sensitizer compound absorbs photons and transfers energy to the emitter compound. This intermediary energy transfer step enables efficient up-conversion under ambient conditions by bridging the gap between photon absorption and light emission, overcoming the limitations of direct two-photon excitation in organic systems.
Solution Approach 2:
The patent creates a composite system consisting of two organic compounds: a sensitizer and an emitter. This composite material approach combines the advantages of both components - the sensitizer absorbs light efficiently while the emitter provides high quantum efficiency emission, achieving superior up-conversion efficiency under ambient conditions while maintaining low manufacturing costs.
3Reliability
If high light intensities are used for up-conversion, then up-conversion efficiency is improved, but device complexity and operational constraints increase
Solution Approach 1:
The patent changes the operational parameters by using compounds with high two-photon absorption cross-sections and optimized energy level matching. This allows the system to achieve high up-conversion efficiency at low pump intensities, eliminating the need for complex high-intensity laser systems and simplifying device operation while maintaining high reliability.
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 enhances the versatility and efficiency of photon energy up-conversion, allowing for the creation of versatile opto-electronic devices that can operate effectively at room temperature and support large-area film formation, overcoming the limitations of previous systems.
Implementation Method 1
a first component is capable of absorbing energy at a first wavelength region w≦λ1≦x, which first component acts as a sensitiser in said composition, and wherein a second component is capable of emitting energy at a second wavelength region y≦λ2≦z, which second component acts as an emissive component in said composition, wherein λ2≦λ1, and wherein, upon absorption of energy by said first component at said first wavelength region λ1, said emissive component emits energy at said second wavelength region λ2
Implementation Method 2
This phenomenon, which is also related to as 'frequency up-conversion' or shortly 'up-conversion' is most often associated with high light intensities available from pulsed lasers
Data Source
AI summary
The present invention relates to a composition for photon energy up-conversion, a system comprising said composition and to uses of said composition and said system.