Halophosphate Phosphor Composition for Low Chlorine Ion Elution
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Solution Overview
Problem
Light-emitting devices using halophosphate phosphors with alkaline earth metals experience a decrease in luminous flux over time due to chlorine ion elution, which affects the durability and efficiency of the devices.
Innovation Solution
A halophosphate phosphor is developed with an alkaline earth metal, europium, and chlorine, where the elution amount of chlorine ions is 7 ppm or less after contact with pure water at 85°C for five hours, and a manufacturing method involving acid-treatment and shear force application to inhibit chlorine ion elution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a halophosphate phosphor including an alkaline earth metal is used in a light-emitting device, then the luminous flux is initially high, but the luminous flux decreases over time due to chlorine ion elution
Solution Approach 1:
The patent applies parameter changes by controlling the elution amount of chlorine ions to be 7 ppm or less after contact with pure water at 85°C for five hours. This specific parameter control of chlorine ion elution resolves the contradiction by maintaining high luminous flux while improving durability through reduced chemical degradation.
Solution Approach 2:
The patent converts the harmful effect of chlorine ions (which cause resin deterioration and luminous flux decrease) into a benefit by严格控制 their elution amount to 7 ppm or less. By controlling the harmful chlorine ion release, the phosphor maintains its initial high luminous flux performance while preventing long-term degradation, thus converting potential harm into reliable performance.
2Reliability
If acid-treatment is applied to the halophosphate phosphor, then the chlorine ion elution is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies preliminary action by performing acid-treatment on the halophosphate phosphor during the manufacturing process. This preliminary treatment reduces chlorine ion elution before the phosphor is used in the light-emitting device, thereby improving reliability while managing manufacturing complexity through integrated process design.
3Reliability
If the elution amount of chlorine ions is reduced to 7 ppm or less, then the deterioration of resin and other components is minimized, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by establishing a specific threshold for chlorine ion elution amount (7 ppm or less) under controlled conditions (pure water, 85°C, five hours). This parameter specification enables manufacturers to control the elution amount with defined precision requirements, thereby minimizing resin and component deterioration while maintaining achievable manufacturing standards.
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 halophosphate phosphor effectively reduces the decrease in luminous flux over time, enhancing the durability and efficiency of light-emitting devices by minimizing chlorine ion-induced deterioration of resin and other components.
Implementation Method 1
acid-treating the halophosphate
Implementation Method 2
applying a shear force to a first treated product formed in the acid-treating
Data Source
AI summary
The halophosphate phosphor includes a halophosphate including an alkaline earth metal including at least calcium; europium; and a halogen including at least chlorine. An elution amount of chlorine ions after the halophosphate phosphor is brought into contact with 10 times by mass of pure water at 85° C. for five hours is 7 ppm or less.