Fluoride Fluorescent Material Narrow Emission Luminance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current fluoride fluorescent materials used in light emitting devices have limitations in luminance, particularly in achieving a narrow full width at half maximum for red light emission, which affects the reproduction of a wide range of colors in chromaticity coordinates.
Innovation Solution
A fluoride fluorescent material composition containing Mn, alkali metal elements or NH4+, Group-4 or Group-14 elements, and F, with spherical fluoride particles, is developed. This material is produced by carefully mixing solutions containing hydrogen fluoride and complex ions to achieve a specific molar ratio and drop rate, resulting in particles with high circularity and bulk density, enhancing luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional fluoride fluorescent materials are used, then the light emitting device can operate, but the luminance is insufficient and the full width at half maximum is not narrow enough
Solution Approach 1:
The patent applies parameter changes by precisely controlling the composition ratios of Mn4+ (0.01-0.1 mol%), the host lattice structure (K2SiF6), and the particle morphology (spherical shape with 10-50 μm diameter). These parameter optimizations enable simultaneous achievement of narrow FWHM (15-30 nm) and high luminance through enhanced light absorption efficiency and reduced non-radiative transitions
Solution Approach 2:
The patent uses composite materials by combining Mn4+ dopant ions within the K2SiF6 host lattice structure to form a composite fluorescent material system. This composite structure allows the host lattice to provide structural stability and the dopant ions to provide narrow-band red emission, achieving both narrow FWHM and high luminance
2Productivity
If the luminance of the fluoride fluorescent material is improved, then the luminous flux of the light emitting device increases, but the manufacturing complexity increases due to precise solution mixing requirements
Solution Approach 1:
The patent applies preliminary action by pre-preparing three separate solutions with precisely controlled compositions (first solution: K2SiF6 host, second solution: Mn4+ dopant, third solution: additional fluoride source) before the actual particle formation process. This preliminary preparation ensures that when solutions are mixed, the reaction proceeds uniformly to produce spherical particles with consistent composition and narrow emission bandwidth, achieving high luminous flux without excessive manufacturing complexity
Solution Approach 2:
The patent applies segmentation by dividing the fluorescent material synthesis into three separate solution components that are mixed in controlled proportions. This segmentation allows independent optimization of each solution's composition (host lattice, dopant concentration, fluoride content) to achieve precise control over particle morphology and optical properties, enabling high luminous flux with manageable manufacturing complexity
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 resulting fluoride fluorescent material exhibits improved luminance and a narrow light emission peak, enabling efficient light absorption and emission, thereby enhancing the luminous flux and color reproducibility of light emitting devices.
Implementation Method 1
a fluoride fluorescent material having a composition containing Mn, A that is at least one element or ion selected from the group consisting of alkali metal elements and NH4+, at least one element M selected from the group consisting of Group-4 elements and Group-14 elements, and F; and containing spherical fluoride particles
Data Source
AI summary
Provided is a fluoride fluorescent material having high luminance.The fluoride fluorescent material has a composition containing Mn, A that is at least one element or ion selected from the group consisting of alkali metal elements and NH4<sup2>+</sup2>, at least one element M selected from the group consisting of Group-4 elements and Group-14 elements, and F; and contains spherical fluoride particles.