Fluoride Fluorescent Material with Thermally Conductive Shell
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Solution Overview
Problem
Conventional fluoride fluorescent materials used in lighting devices, such as those emitting red light, lack sufficient durability for harsh environments, necessitating an improvement in their durability for applications like displays and lighting.
Innovation Solution
A fluoride fluorescent material with a chemical composition of A2[M1−aMn4+aF6] is developed, where A is a cation from Group 1 or 14 elements and M is from Group 4 or 14 of the periodic table, combined with a thermally-conductive substance having higher thermal conductivity than the fluoride particle, arranged on its surface to enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluoride fluorescent materials are used, then red light emission is achieved, but durability in harsh environments is insufficient
Solution Approach 1:
The patent applies composite materials by combining fluoride particle cores with silicate shell layers to create a core-shell structured fluorescent material. The silicate shell acts as a protective layer that enhances durability against environmental factors while maintaining the red light emission properties of the fluoride core. This composite structure resolves the contradiction by providing both the desired optical performance and improved environmental stability.
2Illumination intensity
If fluoride fluorescent materials are used for red light emission, then color purity is achieved, but heat dissipation capability is insufficient
Solution Approach 1:
The silicate shell serves as an intermediary layer between the fluoride particle core and the external environment. It mediates heat transfer by providing a thermally conductive pathway that facilitates heat dissipation from the fluorescent core, while simultaneously protecting the core's optical properties. This intermediary structure allows the material to maintain color purity while improving heat management capabilities.
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 fluoride fluorescent material exhibits superior durability, maintaining light-emitting efficiency and color stability over time, suitable for use in severe environments like lighting and displays, with the thermally-conductive substance aiding in heat dissipation and reducing performance degradation.
Implementation Method 1
a thermally-conductive substance having a higher thermal conductivity than the fluoride particle, and that is arranged on at least a portion of a surface of the fluoride particle
Implementation Method 2
Fluorescent materials used in displays are particularly desired to have both superior light emission efficiency and superior color purity
Data Source
AI summary
A fluoride fluorescent material, comprising:a fluoride particles having a chemical composition represented by the formula (I):A2[M1−aMn4+aF6] (I)wherein 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 elements from Group 4 of the periodic table and elements from Group 14 of the periodic table; and variable a satisfies 0<a<0.2; anda thermally-conductive substance having a higher thermal conductivity than the fluoride particles, and that is arranged on at least a portion of a surface of the fluoride particles, and a method for producing the fluoride fluorescent material.