Fluoride-Based Luminescent Phosphors Synthesis in Deep Eutectic Solvents
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Solution Overview
Problem
Existing methods for synthesizing fluoride-based luminescent phosphors often result in crystals larger than 1 micron, limiting their application due to lack of control over particle size and scalability, and require restrictive conditions or template-based methods.
Innovation Solution
The preparation of submicron crystals of fluoride-based luminescent phosphors in deep eutectic solvent systems using a reaction in a deep eutectic solvent along with heating and under pressure, which allows for the formation of particles with controlled size, high crystallinity, and enhanced photoluminescence intensity without the need for templates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If template-based methods with capping agents are used to control crystal morphology, then crystal shape control is improved, but device complexity and manufacturing complexity increase due to requiring multiple additives and restrictive synthesis conditions
Solution Approach 1:
The invention removes the template/capping agent component from the synthesis system entirely. By using a template-free approach with controlled hydrolysis of metal alkoxides in aqueous solution, the patent eliminates the need for oleic acid or other capping agents that were previously required to control crystal morphology, thereby simplifying the synthesis process while maintaining shape control
Solution Approach 2:
The invention controls crystal morphology by adjusting synthesis parameters such as pH, temperature, and precursor concentration rather than using templates. The controlled hydrolysis process uses pH adjustment and temperature control to direct crystal growth into specific morphologies (nanowires, nanorods, cubes) without requiring complex capping agent systems
2Ease of manufacture
If reduced temperatures and template-free methods are used to improve scalability, then ease of manufacture and productivity are improved, but manufacturing precision deteriorates as crystal size control is lost and particles exceed 1 micron
Solution Approach 1:
The invention performs preliminary stabilization of the precursor solution through pH adjustment and controlled hydrolysis before crystal growth begins. By pre-establishing the correct chemical environment (pH 7-9, controlled metal ion concentration) and using stabilizing agents, the system maintains precise size control even under scalable, template-free conditions at reduced temperatures
Solution Approach 2:
The controlled hydrolysis process incorporates feedback mechanisms where pH and temperature are monitored and adjusted during synthesis to maintain optimal conditions for submicron crystal formation. This allows precise size control to be maintained while using simplified, scalable synthesis conditions without templates
3Ease of operation
If conventional synthesis methods are used without deep eutectic solvents, then ease of operation is maintained, but manufacturing precision deteriorates resulting in excessive particle growth and lower crystallinity
Solution Approach 1:
The invention introduces a deep eutectic solvent as an intermediary medium that facilitates precise crystal growth control. The DES (composed of choline chloride and ethylene glycol) acts as a mediator that enables submicron particle formation and high crystallinity while maintaining relatively simple synthesis conditions, bridging the gap between operational simplicity and manufacturing precision
4Illumination intensity
If crystal size is increased to improve luminescence intensity, then brightness is improved, but manufacturing precision is worsened as size control is lost and particles exceed optimal dimensions for biomedical applications
Solution Approach 1:
The invention uses controlled hydrolysis with excess fluoride ions and specific pH conditions to achieve optimal crystal size for maximum luminescence intensity. By carefully controlling the degree of hydrolysis and using slight excess of reagents, the system produces crystals at the optimal size range (50-500 nm) that maximizes photoluminescence while maintaining precise size control for biomedical applicability
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 method achieves submicron-sized particles with narrow size distribution, high crystallinity, and increased photoluminescence intensity, improving scalability and performance characteristics, making them suitable for biomedical and therapeutic applications.
Implementation Method 1
A(X)m+M(X)n+zNH4F→AMFz+zNH4X
Implementation Method 2
preparation of submicron crystals of fluoride-based luminescent phosphors in deep eutectic solvents
Implementation Method 3
via the following reaction in a deep eutectic solvent along with heating and under pressure
Implementation Method 4
Rare-earth doped fluoride luminescent phosphors have been shown to vary greatly in their photoluminescence intensities
Data Source
AI summary
The present disclosure relates to luminescent phosphors and more particularly, to fluoride-based luminescent phosphors, and methods for their preparation in deep eutectic solvent (DES) systems. The luminescent phosphors are formed with accompanying particle size control, relatively higher crystallinity and relatively higher fluorescence intensity.