High-Stability Phosphor Design for Enhanced LED Emission
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Summary
Problems
Conventional phosphors experience significant brightness deterioration when exposed to high-energy excitation sources, necessitating the development of a phosphor with improved chemical and thermal stability and high emission intensity, especially when combined with LEDs of wavelengths less than 470 nm.
Innovation solutions
A phosphor with a host crystal structure of Sr1Si3Al2O4N4 or a crystal system thereof, incorporating elements like Sr, Ba, Si, Al, and N, and activated with ions such as Eu, which exhibits high brightness and stability, allowing for efficient blue light emission with minimal degradation under high-energy excitation.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If conventional phosphors (silicate, phosphate, aluminate, sulfide) are used, then the phosphor can be excited by high energy sources, but the luminance deteriorates significantly due to exposure
Why choose this principle:
The patent changes the chemical composition parameters by incorporating nitrogen into the crystal structure to form nitride and oxynitride phosphors. This fundamental compositional change transforms the phosphor's resistance to high-energy excitation, maintaining luminance stability while enabling excitation by UV and blue light sources.
Principle concept:
If conventional phosphors (silicate, phosphate, aluminate, sulfide) are used, then the phosphor can be excited by high energy sources, but the luminance deteriorates significantly due to exposure
Why choose this principle:
The patent creates composite phosphor materials combining multiple elements (e.g., Ca-Al-Si-N-O system) to achieve both high-energy excitation resistance and stable luminance. The composite structure integrates nitrogen-containing compounds with specific metal oxides to form a synergistic material that resists brightness deterioration.
Application Domain
Data Source
AI summary:
A phosphor with a host crystal structure of Sr1Si3Al2O4N4 or a crystal system thereof, incorporating elements like Sr, Ba, Si, Al, and N, and activated with ions such as Eu, which exhibits high brightness and stability, allowing for efficient blue light emission with minimal degradation under high-energy excitation.
Abstract
Provided is a chemically-thermally stable phosphor having different emission characteristics from the conventional and exhibiting high emission intensity with an LED of 470 nm or less. A phosphor of the present invention includes A, D, E, and X elements (A is one or more kinds selected from Mg, Ca, Sr and Ba; D is one or more kinds selected from Si, Ge, Sn, Ti, Zr and Hf; E is one or more kinds selected from B, Al, Ga, In, Sc, Y and La; and X is one or more kinds selected from O, N and F), and an inorganic crystal of a crystal designated by Sr1Si3Al2O4N4, another inorganic crystal having the same crystal structure as Sr1Si3Al2O4N4, or a solid-solution crystal thereof, wherein M (one or more kinds of elements selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, and Yb) is solid-solved.