Luminophore for NIR Spectrometry via Photoluminescence
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Solution Overview
Problem
Current luminophores and optoelectronic components have limitations in efficiency and wavelength conversion, particularly in near-infrared spectrometry, where they struggle to achieve high photoluminescence quantum yield and broad emission spectra for effective material analysis in NIR spectroscopy.
Innovation Solution
A luminophore with the general formula AxMyXz:RE, where A and M are trivalent cations, X are divalent anions, and RE are specific dopants like Ni, Mn, Cr, Co, Fe, and Sn, is developed, with a process involving high-temperature heating of chalcogenide oxides to produce particles with tailored crystal structures and dopant ratios for enhanced photoluminescence and wavelength conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional thermal emitters are used for NIR spectrometry, then broad emission spectra can be achieved, but heat evolution is high and operational costs increase
Solution Approach 1:
The patent changes the fundamental operating parameters by transitioning from thermal emission to photoluminescence excitation. The luminophore is excited by UV or blue LEDs at specific wavelengths, causing it to emit in the NIR range through photoluminescence rather than thermal radiation. This parameter change from thermal to optical excitation eliminates the need for high heat generation while achieving broad NIR emission spectra suitable for spectrometry
Solution Approach 2:
The patent replaces the thermal emission mechanism with a photoluminescence-based system. Instead of using thermal energy to generate broadband radiation, the system uses photonic excitation of the luminophore material, which then emits NIR radiation through electronic transitions. This substitution of the emission mechanism from thermal to optical reduces energy loss as heat while maintaining broad spectral coverage
2Productivity
If luminophore composition is optimized for high photoluminescence quantum yield, then conversion efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the compositional parameters of the luminophore, specifically the ratios of trivalent cations (A and M) and divalent anions (X), along with dopant concentrations. By carefully controlling these stoichiometric parameters during synthesis, the patent achieves high photoluminescence quantum yield while managing the complexity of manufacturing precision through systematic composition design
3Adaptability or versatility
If broad emission spectra are achieved through luminophore design, then NIR spectrometry effectiveness improves, but photoluminescence quantum yield may decrease
Solution Approach 1:
The patent employs composite luminophore materials containing multiple trivalent cations (A and M from different periodic table groups) and divalent anions in specific combinations. This composite structure allows the material to exhibit both broad emission spectra across the NIR range and high photoluminescence quantum yield, as the different cation-anion combinations contribute to both spectral breadth and efficient radiative transitions
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 achieves a high photoluminescence quantum yield and adjustable emission spectra, enabling efficient conversion of electromagnetic radiation from UV to near-infrared ranges, suitable for NIR spectrometry with reduced heat evolution and lower operational costs compared to traditional thermal emitters.
Implementation Method 1
The luminophore converts electromagnetic radiation in an excitation spectrum having an excitation maximum between 400 nanometers and 500 nanometers inclusive and/or between 600 nanometers and 750 nanometers inclusive to electromagnetic radiation in an emission spectrum having an emission maximum at a wavelength between 1200 nanometers and 1500 nanometers inclusive
Data Source
AI summary
A luminophore may have the general formula AxMyXz:RE. A may be selected from the group of the trivalent cations. M may be selected from the group of the trivalent cations and includes at least two elements from the following group: Ga, Sc, Al, In, Sb, Bi, As, and Lu. X may be selected from the group of the divalent anions. RE may be a dopant and may be selected from the group formed by the following elements and the combinations of the following elements: Ni, Mn, Cr, Co, Fe, and Sn, where0.8≤x≤1.2,0.8≤y≤1.2 and2.7≤z≤3.3.A process is also disclosed for producing a luminophore, an optoelectronic component, and an NIR spectrometer.