Small-Molecule Ionic Lattices for Bright Solid-State Fluorescence
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Solution Overview
Problem
Existing technologies face challenges in preparing solid state forms of organic dyes that retain the bright color and fluorescence properties of their solution state.
Innovation Solution
The development of Small Molecule Isolation LatticES (SMILES) materials, which are formed by mixing ionic dyes with counterions and chelator ligands to create ionic lattices, spatially and electronically isolating the dyes, resulting in materials with enhanced fluorescence intensity and color-matched properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If organic dyes are prepared in solid state forms, then the material stability and ease of handling are improved, but the fluorescence intensity and color brightness are significantly reduced compared to solution state
Solution Approach 1:
The patent introduces counterion receptor complexes as intermediary structures that bind counterions and spatially isolate cationic dyes. These complexes act as mediators between the dye molecules and the solid state matrix, preventing direct dye-dye interactions that cause quenching while maintaining solid state stability. The receptor complexes create isolated environments that preserve the optical properties of dyes in solid form.
Solution Approach 2:
The invention creates localized isolated environments around each dye molecule using counterion receptor complexes. Each dye molecule is surrounded by its own counterion-receptor complex, creating a unique local environment that prevents aggregation and maintains individual dye fluorescence characteristics. This local isolation strategy allows different regions of the solid material to have distinct, controlled interactions.
2Ease of manufacture
If organic dyes are prepared in solid state forms, then the ease of manufacture and application are improved, but the color brightness and emission properties become unpredictable
Solution Approach 1:
The patent systematically controls the stoichiometric ratios of dye to counterion receptor complex (typically 1:1 or 1:2 ratios) to ensure consistent formation of isolated dye complexes. By controlling the concentration, pH, and solvent conditions during preparation, the invention achieves reproducible solid state materials with consistent optical properties. The use of excess receptor complexes ensures complete isolation of all dye molecules.
Solution Approach 2:
The counterion receptor complexes serve as standardized intermediary units that mediate between the dye and the solid matrix. These pre-formed complexes provide a consistent structural framework that ensures uniform dye isolation and predictable optical properties across different batches and preparations.
3Illumination intensity
If counterion receptor complexes are used to isolate dyes, then the fluorescence intensity increases significantly, but the device complexity and preparation steps increase
Solution Approach 1:
The counterion receptor complexes are designed to self-assemble with the dye-counterion pairs through spontaneous complexation. The system self-organizes into isolated complexes without requiring complex external control mechanisms or multiple processing steps. The thermodynamic driving force of complex formation ensures spontaneous and consistent isolation of dyes.
Solution Approach 2:
The invention creates composite materials combining dye molecules, counterions, and receptor complexes into integrated functional units. This composite approach consolidates multiple components into a single preparable material system that can be manufactured as a unified solid state product, reducing the need for separate processing steps.
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
SMILES materials exhibit significantly higher fluorescence intensity and color-matched properties compared to solid-state preparations, with a 25-fold increase in intensity observed for certain compositions, and can be used in various forms such as powders, thin films, and polymer composites.
Implementation Method 1
counterion receptor is a binding ligand for the counterion
Implementation Method 2
SMILES materials exhibit significantly higher fluorescence intensity
Data Source
AI summary
The present disclosure concerns the design, formulations, preparations and optical properties of compounds of Formulas (I) and (VI):(charged dyem+)x·(counterionn−)y·(counterion receptor)z (I) and(charged dyem−)x·(counterionn+)y·(counterion receptor)z (VI).The charged dyem+ is a cationic dye, counterionn− is an anion, and counterion receptor is a binding ligand for the counterionn−, wherein m, n, x and y are integers greater than or equal to 1, and products of x·n and m·y are identical for formula (I).The charged dyem− is a anionic dye, counterionn+ is a cation, and counterion receptor is a binding ligand for the counterionn+, wherein m, n, x and y are integers greater than or equal to 1, and products of x·n and m·y are identical for formula (VI).