Broadband Optical Upconversion via Dye Antenna Energy Transfer
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Solution Overview
Problem
Current optical upconversion materials, such as rare earth doped materials, are limited by narrow bandwidth sensitivity and low absorption probability, making them impractical for broad applications.
Innovation Solution
Development of nanomaterials comprising a transition-metal doped nanocrystal bonded with an optical antenna, allowing for broad-band absorption and efficient energy transfer through Förster resonance energy transfer, enabling enhanced sensitivity and performance across various wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rare earth doped materials are used for optical upconversion, then upconversion can be achieved, but the bandwidth sensitivity is narrow and absorption probability is low
Solution Approach 1:
The patent creates a composite nanomaterial system combining organic dye molecules with inorganic upconverting nanocrystals. The organic component provides broad-band absorption while the inorganic component performs frequency upconversion, achieving both wide spectral coverage and high absorption probability simultaneously
Solution Approach 2:
The patent introduces an intermediary energy transfer mechanism where organic dyes act as antennas that absorb broadband light and transfer energy to rare earth ions in the nanocrystal. This intermediary approach allows the system to overcome the narrow bandwidth limitation of direct rare earth absorption while maintaining efficient upconversion
2Object-affected harmful factors
If the nanocrystal size is reduced to avoid Mie or Rayleigh scattering, then the material becomes invisible, but the absorption probability decreases
Solution Approach 1:
The patent changes the size parameter of the nanocrystal to be below the scattering threshold (less than 150 nm) to eliminate harmful scattering effects, while compensating for the reduced absorption by introducing organic dye antennas with high absorption cross-sections that couple to the nanocrystal surface
3Adaptability or versatility
If transition metal dopants are used for upconversion, then broad-band absorption is achieved, but the device complexity increases
Solution Approach 1:
The patent segments the functional requirements into two distinct components: organic dye molecules responsible for broadband light absorption and inorganic upconverting nanocrystals responsible for frequency conversion. This segmentation allows each component to be optimized independently while simplifying the overall design
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
The nanomaterials exhibit improved sensitivity and absorption probability, enabling applications in solar cells, infrared detection, and laser threat warning systems, while maintaining transparency and avoiding distortion.
Implementation Method 1
efficient energy transfer through Förster resonance energy transfer
Implementation Method 2
Optical upconversion is a process in which a material absorbs two or more photons of lower energy and emits a single photon of higher energy
Data Source
AI summary
An optical upconverting nanomaterial includes a nanocrystal, a ligand layer directly bonded to the nanocrystal, and an optical antenna directly or indirectly bonded to the nanocrystal. The nanocrystal includes a transition metal-doped material exhibiting upconversion to optical wavelengths. The transition metal-doped material includes energy transfer facilitating transition metal dopants and (not necessarily distinct) emitter transition metal dopants, where an absorption spectrum of the energy transfer facilitating transition metal dopants overlaps with an emission spectrum of the optical antenna. The optical upconverting nanomaterial has at least one linear dimension (e.g., width or thickness) that is less than 150 nm in extent.