Halide Phosphor Surface Stabilization via Fluorine Oxidation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Phosphors and other light emitting inorganic materials containing halide atoms are susceptible to degradation under high temperature and high humidity conditions, leading to reduced efficacy.
Innovation Solution
A process involving contacting luminescent halogen-containing materials with a halogen-containing oxidizing agent, such as fluorine gas, at specific temperatures and times to enhance their stability and maintain photoluminescent properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If luminescent halogen-containing materials are used in high temperature and high humidity conditions, then they can operate in demanding environments, but they suffer from degradation and reduced efficacy
Solution Approach 1:
The patent applies preliminary action by treating the luminescent halogen-containing materials with a halogen-containing oxidizing agent before the materials are deployed in high temperature and humidity environments. This pre-treatment stabilizes the materials' surfaces, creating a protective effect that prevents degradation when the materials are later exposed to demanding environmental conditions, thus resolving the contradiction between operational capability and long-term stability.
2Adaptability or versatility
If luminescent halogen-containing materials are exposed to high humidity conditions, then they can be used in various applications, but they experience degradation and reduced efficacy
Solution Approach 1:
The patent applies preliminary action by treating the luminescent halogen-containing materials with a halogen-containing oxidizing agent before the materials are deployed in high temperature and humidity environments. This pre-treatment stabilizes the materials' surfaces, creating a protective effect that prevents degradation when the materials are later exposed to demanding environmental conditions, thus resolving the contradiction between operational capability and long-term stability.
3Reliability
If the materials are treated with halogen-containing oxidizing agent for extended periods, then stability is improved, but processing time increases
Solution Approach 1:
The patent applies parameter changes by optimizing the treatment conditions - using specific concentrations of halogen-containing oxidizing agents, controlling temperature ranges, and establishing minimum treatment durations (at least two hours). These parameter optimizations ensure adequate stabilization of the materials while minimizing unnecessary extended processing time, thus resolving the contradiction between achieving sufficient stability improvement and maintaining efficient processing.
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 process improves the stability and maintains the photoluminescent properties of the materials, effectively addressing degradation issues and ensuring their performance in various applications.
Implementation Method 1
contacting the luminescent halogen-containing material with an atmosphere comprising a halogen-containing oxidizing agent
Data Source
AI summary
A process for treating a luminescent halogen-containing material includes contacting the luminescent halogen-containing material with an atmosphere comprising a halogen-containing oxidizing agent for a period of at least about two hours. The luminescent halogen-containing material has a composition other than(i) Ax[MFy]:Mn4+, where A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is the absolute value of the charge of the [MFy] ion; and y is 5, 6 or 7;(ii) Zn2[MF7]:Mn4+, where M is selected from Al, Ga, In, and combinations thereof;(iii) E[MF6]:Mn4+, where E is selected from Mg, Ca, Sr, Ba, Zn, and combinations thereof; and where M is selected from Ge, Si, Sn, Ti, Zr, and combinations thereof; or(iv) Ba0.65Zr0.35F2.70:Mn4+.