Aluminate Fluorescent Material Composition for High Emission Intensity
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Solution Overview
Problem
Manganese-activated aluminate fluorescent materials used in light emitting devices for backlights have insufficient emission intensity when excited by light in the near-UV to blue region, limiting their application in achieving high color purity and broad color reproducibility.
Innovation Solution
An aluminate fluorescent material with a specific composition containing Ba, Sr, Mg, Mn, and Al, optimized by controlling the molar ratios of these elements to enhance emission intensity, stability, and color purity, is developed, allowing for higher absorption of light in the near-UV to blue region and reduced concentration quenching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional manganese-activated aluminate fluorescent material is used, then the material can emit light when excited with vacuum UV rays, but the emission intensity is insufficient when excited with near-UV to blue light
Solution Approach 1:
The patent changes the compositional parameters of the fluorescent material by introducing specific ratios of Ba, Sr, and Mg elements, and optimizing the Mn activation concentration. The composition formula (Ba1-x-ySrxMgy)Al10O17:Mn2+ with controlled x and y values modifies the crystal structure to absorb near-UV to blue light while maintaining vacuum UV excitation capability, thereby improving emission intensity across both excitation ranges
Solution Approach 2:
The patent creates a composite fluorescent material by combining multiple alkaline earth metal elements (Ba, Sr, Mg) in specific ratios within the aluminate crystal structure. This composite approach allows the material to exhibit both vacuum UV and near-UV to blue light absorption characteristics, resolving the contradiction between maintaining versatility and improving emission intensity
2Manufacturing precision
If the half value width of the emission peak is narrowed to achieve high color purity, then color reproducibility improves, but emission intensity may be reduced
Solution Approach 1:
The patent optimizes the compositional parameters (x and y values in the formula) to control the crystal field splitting and emission characteristics. By precisely adjusting the Ba:Sr:Mg ratio and Mn concentration, the emission peak achieves a narrow half value width for high color purity while the optimized composition maintains high absorption efficiency, preventing emission intensity loss
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 optimized aluminate fluorescent material exhibits increased emission intensity and a narrower half value width of the emission peak, enabling higher color purity and broader color reproducibility, making it suitable for use in various lighting applications, including liquid crystal backlights.
Implementation Method 1
capable of having a high emission intensity through photoexcitation in a near-UV to blue region
Data Source
AI summary
Provided is an aluminate fluorescent material having a high emission intensity and having a composition containing a first element that contains one or more of Ba and Sr, and a second element that contains Mg and Mn. In the composition, when a molar ratio of Al is 10, a total molar ratio of the first element is a parameter a, a total molar ratio of the second element is a parameter b, a molar ratio of Sr is a product of a parameter m and the parameter a, a molar ratio of Mn is a product of a parameter n and the parameter b. The parameters a and b satisfy 0.5<b<a≤0.5b+0.5<1.0, the parameter m satisfies 0≤m≤1.0, and the parameter n satisfies 0.4≤n≤0.7.