Halogen Phosphor Composition for High Luminance and Waterfastness
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Solution Overview
Problem
Existing red phosphors with emission wavelengths above 650 nm suffer from low luminosity and poor waterfastness, making them impractical for use in lighting and display devices, while Mn4+-activated fluorine-containing phosphors deteriorate due to high alkali metal ion content.
Innovation Solution
Development of halogen-containing phosphors with specific chemical compositions incorporating alkaline earth metal elements and Group 13 elements, such as Al, to improve waterfastness and maintain high color purity and luminance, featuring a crystal phase with a chemical composition that includes alkali metal, alkaline earth metal, Group 3/13 elements, and halogen elements, activated by Mn4+, and optimized ratios to enhance durability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If Mn4+-activated fluorine-containing phosphors with high alkali metal ion content are used to achieve high color purity and luminance, then emission wavelength between 600-650 nm is obtained, but waterfastness deteriorates and phosphors deteriorate over time
Solution Approach 1:
The patent changes the chemical composition parameters by limiting alkali metal ion content to 0.01-0.50 mol ratio and introducing alkaline earth metal ions (0.10-0.50 mol ratio) and aluminum ions (0.10-0.50 mol ratio) to achieve the optimal balance between luminance and waterfastness
Solution Approach 2:
The patent creates a composite phosphor material combining multiple elements (alkali metal, alkaline earth metal, aluminum, fluorine, and Mn4+ activator) in specific proportions to achieve synergistic effects that improve both luminance and waterfastness
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 solution provides phosphors with improved waterfastness and durability, maintaining high color purity and luminance, suitable for use in lighting and display devices, offering a high-efficiency and high-color-rendering light-emitting unit, image display device, and lighting device.
Implementation Method 1
A phosphor comprising a crystal phase having a chemical composition represented by the following formula [1], and having an emission peak in a wavelength range of 600 nm to 650 nm, AaBbCcDdXx:R
Data Source
AI summary
The phosphor of the present invention comprises a crystal phase having a chemical composition represented by the following formula [2], the crystal phase having no garnet structure, and the phosphor having an emission peak in a wavelength range of 600 nm to 650 nm by being activated by at least Mn4+,A2aiiB2biiC2ciiD2diiX2xii formula [2].