Halide Oxide Phosphor for Stable Red Emission
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Solution Overview
Problem
Conventional red phosphors require specialized environments for synthesis, increasing manufacturing costs, and suffer from chromaticity deviations due to light absorption issues when used in color mixing applications.
Innovation Solution
A novel phosphor with the general formula aMIX·MII1-xMIMVO4:(Re)x, where MI, MII, MV, and Re are specific atomic elements, and X is a halogen, allowing for nitrogen-free synthesis and reduced light absorption, enabling efficient red light emission with minimal chromaticity variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nitride phosphors are used to achieve red light emission, then red phosphor performance is improved, but manufacturing cost increases due to specialized synthesis environments
Solution Approach 1:
The patent changes the chemical composition parameters by replacing nitrogen-containing compounds with oxygen-containing compounds (halide oxides). This fundamental parameter change allows the phosphor to be synthesized under normal atmospheric conditions rather than requiring specialized deoxidized or high-pressure environments, thereby reducing manufacturing cost while maintaining red light emission performance
Solution Approach 2:
The invention uses readily available and inexpensive raw materials such as metal halides and metal oxides that can be synthesized under normal conditions. These materials are more accessible and cheaper than the specialized reagents required for nitride phosphor synthesis, making the manufacturing process more economical
2Reliability
If red phosphors with excitation edge at 500-550 nm are used for white light realization, then red light emission is achieved, but chromaticity deviation increases due to light absorption from other color phosphors
Solution Approach 1:
The patent changes the excitation spectrum parameters by designing a phosphor with excitation edge below 450 nm (preferably below 420 nm). This parameter change ensures that the red phosphor does not absorb light in the 450-550 nm range, preventing chromaticity deviation when used in combination with blue, green, or yellow phosphors for white light generation
Solution Approach 2:
The invention introduces an intermediary approach by using a halide oxide compound as the host material that mediates between the excitation source and the emission output. This host structure with specific band gap properties allows selective excitation while preventing unwanted absorption, acting as an intermediary that protects the chromaticity stability of the overall phosphor system
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 phosphor achieves low-cost production without specialized environments and maintains consistent chromaticity in color mixing applications by minimizing light absorption, ensuring stable red light emission.
Implementation Method 1
a phosphor which has an excitation edge of no greater than 450 nm, and emits red light whose emission spectrum has a peak wavelength of no less than 600 nm
Data Source
AI summary
A phosphor is represented by the general formulaaMIX·MII1-xMIMVO4:(Re)x where MI is at least one atomic element selected from the group consisting of K, Li, Na, Rb, Cs, Fr, Cu, and Ag, with K being essential; MII is at least one atomic element selected from the group consisting of Mg, Ca, Sr, Ba, Ra, Mn, Zn, Cd, and Sn; MV is at least one atomic element selected from the group consisting of P, V, Nb, Ta, As, Sb, and Bi; X is at least one halogen element, with F being essential; Re is at least one atomic element selected from the group consisting of rare earth elements, with Eu being essential; and a is in the range 0.6≤a≤1.4.