Non-Aqueous Fluoride Phosphor Precipitation for Higher Light Emission
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Solution Overview
Problem
The optical characteristics of inorganic fluoride luminescent materials are adversely affected by hydroxide ions (OH−) or water (H2O) present in aqueous solutions used in their production, leading to decreased light emission performance.
Innovation Solution
A method involving the use of a non-aqueous hydrogen fluoride-containing liquid with a specific hydrogen fluoride content range to produce a non-aqueous solution with ions derived from a first inorganic fluoride luminescent material, followed by contact with a non-aqueous organic liquid to precipitate a second inorganic fluoride luminescent material, thereby minimizing the impact of hydroxide ions and enhancing light emission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an aqueous solution containing hydrogen fluoride is used to produce inorganic fluoride luminescent material, then the production process is simple and easy to manufacture, but the optical characteristics and light emission performance are adversely affected by hydroxide ions and water
Solution Approach 1:
The patent changes the fundamental parameter of the solvent system from aqueous to non-aqueous. Specifically, it uses a mixed solvent system comprising a carboxylic acid (such as acetic acid) and an alcohol (such as ethanol or isopropyl alcohol) instead of water. This parameter change eliminates hydroxide ions and water from the production process, thereby preventing their adverse effects on optical characteristics while maintaining production feasibility.
Solution Approach 2:
The patent creates an inert production environment by using a non-aqueous solvent system that does not contain water or hydroxide ions. The carboxylic acid-alcohol mixed solvent system acts as an inert environment that prevents harmful chemical reactions with the luminescent material, thereby protecting the optical characteristics during the production process while still allowing for effective synthesis.
2Reliability
If a non-aqueous hydrogen fluoride-containing liquid is used to produce inorganic fluoride luminescent material, then the light emission characteristics are improved by reducing hydroxide ion influence, but the production process becomes more complex
Solution Approach 1:
The patent simplifies the non-aqueous production process by selecting a specific parameter combination: a carboxylic acid (such as acetic acid) mixed with an alcohol (such as ethanol or isopropyl alcohol) in a volume ratio of 1:3 to 3:1. This parameter optimization achieves effective precipitation of the luminescent material while maintaining process simplicity, thus improving light emission characteristics without excessive complexity increase.
Solution Approach 2:
The patent uses a mixed solvent system of carboxylic acid and alcohol as an intermediary medium. This intermediary system facilitates the precipitation of inorganic fluoride luminescent material from hydrogen fluoride solution without requiring complex equipment or multiple processing steps. The mixed solvent acts as a bridge that enables simple yet effective separation and purification, reducing overall process complexity while achieving high-quality luminescent materials.
3Productivity
If aqueous solution is used for production, then the luminescent material can be produced efficiently, but the internal quantum efficiency is reduced due to moisture and hydroxide ions
Solution Approach 1:
The patent changes the solvent system parameter from aqueous to non-aqueous (carboxylic acid-alcohol mixture), which eliminates water and hydroxide ions that reduce internal quantum efficiency. This parameter change maintains production efficiency because the mixed solvent system still allows for effective dissolution, reaction, and precipitation processes, while simultaneously achieving high internal quantum efficiency by preventing harmful interactions with moisture.
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 method produces inorganic fluoride luminescent materials with improved light emission characteristics by reducing the influence of hydroxide ions, resulting in materials suitable for use in lighting and liquid crystal display backlighting applications.
Implementation Method 1
bringing a first inorganic fluoride luminescent material and a non-aqueous hydrogen fluoride-containing liquid having a hydrogen fluoride content in a range of 20% by mass or more and 100% by mass or less into contact with each other to obtain a non-aqueous solution containing ions derived from the first inorganic fluoride luminescent material
Implementation Method 2
bringing the non-aqueous solution and a non-aqueous organic liquid having a hydrogen fluoride content of less than 20% by mass into contact with each other to precipitate a second inorganic fluoride luminescent material
Data Source
AI summary
Provided is a method for producing an inorganic fluoride luminescent material having excellent light emission characteristics by using a non-aqueous hydrogen fluoride-containing liquid.The method for producing an inorganic fluoride luminescent material includes: bringing a first inorganic fluoride luminescent material and a non-aqueous hydrogen fluoride-containing liquid having a hydrogen fluoride content in a range of 20% by mass or more and 100% by mass or less into contact with each other to obtain a non-aqueous solution containing ions derived from the first inorganic fluoride luminescent material, and bringing the non-aqueous solution and a non-aqueous organic liquid having a hydrogen fluoride content of less than 20% by mass into contact with each other to precipitate a second inorganic fluoride luminescent material.