Fluoride Phosphor Synthesis via Simultaneous Solution Mixing
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Solution Overview
Problem
Existing fluoride phosphors used in light emitting devices face challenges in achieving high luminous flux and durability, particularly in maintaining color purity and emission efficiency.
Innovation Solution
A method for producing a fluoride phosphor involves combining three solutions: one containing group 13 elements, manganese, and fluorine; another with group 4 or 14 elements; and a third with alkali metal elements. These solutions are added simultaneously to synthesize a fluoride phosphor, enhancing the uniform distribution of components and improving crystal composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fluoride phosphors are used in light emitting devices, then manufacturing process is simple, but luminous flux and durability are insufficient
Solution Approach 1:
The manufacturing process is segmented into three separate solutions (first solution with group 13 element and Mn, second solution with group 4 or 14 element, third solution with alkali metal element) that are mixed in a specific sequence and ratio. This segmentation allows precise control of component distribution and crystal composition, resolving the contradiction by enabling high luminous flux through controlled synthesis while maintaining manageable process complexity through systematic solution preparation.
Solution Approach 2:
The patent applies local quality by controlling the spatial and compositional distribution of elements within the phosphor crystal structure. By adding solutions in specific proportions (first solution: second solution: third solution = 3:1:2 to 1:1:1) and using complexing agents selectively, the method achieves uniform local composition that optimizes luminescence properties, thereby improving luminous flux without requiring overly complex manufacturing equipment.
2Manufacturing precision
If conventional fluoride phosphors are used, then manufacturing process is simple, but color purity and emission efficiency are insufficient
Solution Approach 1:
The patent employs parameter changes by systematically varying the composition ratios of elements (group 13 element M1, group 4 or 14 element M2, Mn, and alkali metal M3) within specific ranges. For example, M1 is controlled at 0.01-0.1 mol relative to M2, and Mn is controlled at 0.003-0.05 mol. These precise parameter adjustments optimize the phosphor's emission characteristics and color purity while keeping the manufacturing process achievable through standard chemical synthesis methods.
Solution Approach 2:
The patent creates a composite fluoride phosphor material with the formula M3(2-x-y)M2pM1qMnrFs, combining multiple elements in specific ratios. This composite structure integrates group 13 elements, group 4 or 14 elements, manganese, and alkali metals to achieve superior color purity and emission efficiency. The composite material approach resolves the contradiction by delivering high manufacturing precision through compositional control while using conventional synthesis techniques.
3Reliability
If conventional fluoride phosphors are used, then manufacturing process is simple, but durability is insufficient
Solution Approach 1:
The patent applies preliminary action by pre-preparing three separate solutions with specific compositions before synthesis. The first solution contains the group 13 element and Mn complexed with a complexing agent, the second solution contains the group 4 or 14 element, and the third solution contains the alkali metal element. This preliminary preparation ensures uniform distribution of elements during mixing, leading to consistent crystal structure and enhanced durability, while keeping the overall process manageable through systematic solution preparation.
Solution Approach 2:
The patent uses a complexing agent as an intermediary substance in the first solution to control the behavior of group 13 elements and manganese during synthesis. The complexing agent facilitates uniform distribution of these elements and ensures proper incorporation into the crystal structure, thereby improving durability. This intermediary approach resolves the contradiction by achieving reliable results through chemical mediation while maintaining a straightforward manufacturing workflow.
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 method results in a fluoride phosphor that significantly improves luminous flux and durability in light emitting devices, with enhanced color purity and emission efficiency, as demonstrated by higher initial luminous flux and improved durability compared to comparative examples.
Implementation Method 1
adding the second solution and the third solution to the first solution at substantially the same time to obtain a first fluoride phosphor
Data Source
AI summary
Provided is a method for producing a fluoride phosphor. The method includes: providing a first solution containing an element M1 containing at least one selected from the group consisting of group 13 elements, manganese, and fluorine, a second solution containing an element M2 containing at least one selected from the group consisting of group 4 elements and group 14 elements, and a third solution containing at least one selected from the group consisting of alkali metal elements; and adding the second solution and the third solution to the first solution at substantially the same time.