Fluoride Fluorescent Material Durability via Pressurization
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Solution Overview
Problem
Conventional fluoride fluorescent materials used in lighting applications lack durability, particularly in severe environments, and do not meet the requirements for high light-emitting efficiency and color purity needed for applications like liquid crystal display backlights.
Innovation Solution
A method involving a pressurization treatment and a heating treatment of a fluoride compound with a specific chemical composition (A2[M1−aMn4+aF6) in a liquid medium, where A is a cation from K+, Li+, Na+, Rb+, Cs+, or NH4+, and M is from Group 4 or Group 14 elements, to produce a fluoride fluorescent material with improved durability and light-emitting characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluoride fluorescent materials are used, then production is simpler, but durability in severe environments deteriorates
Solution Approach 1:
The patent applies preliminary action by performing pressurization treatment and heating treatment on the fluoride fluorescent material before it is fully formed or during the production process. This pre-treatment stabilizes the crystal structure and improves durability in severe environments, addressing the reliability issue before the material is put into service.
Solution Approach 2:
The patent changes physical parameters (pressure and temperature) during the production process to improve material durability. By subjecting the fluoride fluorescent material to specific pressurization and heating conditions, the crystal structure is optimized for better environmental resistance, resolving the contradiction between durability and production complexity.
2Manufacturing precision
If fluorescent materials with narrow half-value width are used, then color purity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes compositional parameters by introducing a specific general formula A2[M1-aMn4+aF6] with defined ranges for elements A, M, and substitution ratio a. This parameter optimization achieves narrow half-value width for better color purity while maintaining manufacturability through controlled compositional variations.
Solution Approach 2:
The patent applies local quality by optimizing specific compositional ratios (the substitution ratio a of Mn4+ ions) within the crystal structure. This localized compositional control enables precise tuning of emission characteristics to achieve narrow half-value width and high color purity without requiring extreme manufacturing precision throughout the entire material.
3Use of energy by moving object
If high light-emitting efficiency is pursued, then energy consumption is reduced, but material durability deteriorates
Solution Approach 1:
The patent optimizes compositional parameters (element selection and substitution ratios) to achieve high light-emitting efficiency through enhanced luminescence properties. Simultaneously, pressurization and heating treatments modify the crystal structure to improve durability, resolving the contradiction between energy efficiency and material reliability.
Solution Approach 2:
The patent creates a composite fluorescent material with multiple elements (A, M, Mn4+) in specific ratios, combining the advantages of different elements. This composite structure enables both high light-emitting efficiency from optimized luminescent centers and improved durability from the stabilized crystal matrix, addressing both energy efficiency and reliability requirements.
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 treated fluoride fluorescent material exhibits a rate of decrease in light-emitting energy efficiency of 5% or less under laser irradiation, high reflectance at 510 nm, and minimal emission brightness loss under high-temperature and high-humidity conditions, enhancing its durability and performance in lighting devices.
Implementation Method 1
A light emitting diode (LED) is a semiconductor light emitting element produced from a metal compound such as gallium nitride (GaN). The semiconductor light emitting element is combined with fluorescent materials for the development of various light emitting devices that emit light of white color, bulb color, orange color and so on.
Implementation Method 2
A method for producing a fluoride fluorescent material includes subjecting a mixture that contains a fluoride compound in a liquid medium to a pressurization treatment and a heating treatment
Data Source
AI summary
A method for producing a fluoride fluorescent material includes: subjecting a mixture that contains a fluoride compound in a liquid medium to a pressurization treatment and a heating treatment, the fluoride compound having a chemical composition represented by the following formula: A2[M1−aMn4+aF6]. A is at least one cation selected from the group consisting of K+, Li+, Na+, Rb+, Cs+and NH4+, M is at least one element selected from the group consisting of Group 4 elements and Group 14 elements, and a is a number that satisfies 0 <a <0.2. The pressurization treatment is performed at a pressure of 1.5 MPa or higher.