Silicate Nitride Luminophore Composition for Broad-Spectrum Emission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing luminophores fail to efficiently cover the entire wavelength range from cyan to near-infrared (NIR) and suffer from quenching effects at high irradiance levels, limiting their application in various lighting and spectroscopic applications.
Innovation Solution
A luminophore with the formula EA2−xRExSi5−x−yAlx+yN8−yOy:A, where EA is an alkaline earth element, RE is a rare earth element, and A is an activator, offering flexible emission spectra from cyan to NIR, stable against quenching, and suitable for various applications by adjusting x and A.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional luminophores are used to cover the wavelength range from cyan to NIR, then the emission spectrum can be extended, but quenching effects occur at high irradiance levels
Solution Approach 1:
The patent changes the chemical composition parameters of the luminophore by incorporating rare earth elements (Eu, Ce, Pr, Nd) into the alkaline earth silicate nitride structure. This compositional modification enables the luminophore to achieve both broad wavelength coverage from cyan to NIR and resistance to quenching effects at high irradiance levels, resolving the technical contradiction between emission range and stability.
2Adaptability or versatility
If multiple luminophores are used to cover different wavelength ranges, then the spectral coverage can be improved, but the device complexity increases
Solution Approach 1:
The patent creates a universal luminophore material system (EA2-xRExSi5-x-yAlx+yN8-yOy) that can simultaneously provide multiple emission wavelengths from cyan to NIR by adjusting the rare earth element composition. This single multi-functional luminophore replaces the need for multiple separate luminophores, thereby reducing device complexity while maintaining broad spectral coverage.
Solution Approach 2:
The patent merges the functions of multiple wavelength-emitting luminophores into a single compound by combining rare earth elements with different emission characteristics (Eu for red, Ce for cyan-green, Pr for blue-green, Nd for NIR) within the same alkaline earth silicate nitride host structure. This consolidation achieves broad spectral coverage without increasing the number of separate components.
3Illumination intensity
If the luminophore composition is optimized for specific wavelength emission, then the emission intensity can be improved, but the applicability to different lighting applications is reduced
Solution Approach 1:
The patent creates a dynamic and adjustable luminophore composition where the rare earth element ratios (x, y parameters) can be varied to optimize emission intensity for specific applications. The same base compound EA2-xRExSi5-x-yAlx+yN8-yOy can be tuned to emphasize different wavelength ranges, enabling the luminophore to maintain high emission intensity across diverse lighting applications including human-centric lighting, spectroscopy, and IR-enhanced lighting.
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 luminophore provides efficient wavelength conversion across a broad spectrum, suitable for human-centric lighting, spectroscopic applications, and IR-enhanced lighting, with reduced quenching effects at high irradiance levels.
Implementation Method 1
The luminophore absorbs electromagnetic radiation that has a different wavelength maximum than the electromagnetic radiation emitted by the luminophore. For example, the luminophore absorbs radiation with a wavelength maximum at shorter wavelengths than the emission maximum and thus emits radiation with an emission maximum shifted towards red.
Data Source
AI summary
A luminophore has the general formula EA2−xRExSi5−x−yAlx+yN8−yOy:A, where0<x≤2 and 0≤y≤2, EA is an element or a combination of elements from the group of alkaline earth elements, RE is an element or a combination of elements from the group of rare earth elements, and A is an activator element. A method for the production of a luminophore and a radiation-emitting component are further disclosed.