Cr-Ni Oxide Fluorescent Material for Wide Near-Infrared Emission
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Solution Overview
Problem
Current light emitting devices with fluorescent materials struggle to achieve a light emission peak wavelength in the red to near infrared range with a large full width at half maximum and high light emission energy, which is essential for applications like medical imaging and non-destructive food analysis.
Innovation Solution
An oxide fluorescent material with a composition of (Li1-tM1)t(uGa1-vM2)5Ow:Crx,Niy, where M1 represents elements like Na, K, Rb, and Cs, M2 represents B, Al, Sc, In, and rare earth elements, and M3 represents Si, Ge, Sn, Ti, Zr, Hf, Bi, V, Nb, Ta, with specific molar ratios, is developed to emit light in the desired wavelength range, utilizing Cr and Ni as activator and co-activator elements to enhance light emission energy and spectrum width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional fluorescent materials are used, then the light emitting device can operate, but the light emission energy and full width at half maximum in the red to near infrared range are insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the fluorescent material by incorporating Cr and Ni elements in specific molar ratios within the LiGa5O8 host lattice. This compositional parameter adjustment enables the material to emit light with peak wavelengths in the red to near infrared range (600-900 nm) while achieving high light emission energy and a full width at half maximum of 150 nm or more, directly resolving the insufficiency of conventional materials in this wavelength range.
Solution Approach 2:
The patent creates a composite fluorescent material by combining Cr and Ni dopants within the LiGa5O8 crystal structure. This composite approach, where Cr serves as the primary activator and Ni as the co-activator, produces synergistic effects that enhance light emission energy and broaden the emission spectrum in the red to near infrared range, overcoming the limitations of single-element doped materials.
2Adaptability or versatility
If the light emission peak wavelength is shifted to near infrared range, then the application range expands, but the light emission intensity decreases
Solution Approach 1:
The patent optimizes the molar ratios of Cr and Ni elements within the LiGa5O8 host to achieve peak light emission in the near infrared range (1,150 nm to 1,300 nm) while maintaining high emission intensity. By precisely controlling the dopant concentrations and their interaction within the crystal lattice, the material achieves both the desired wavelength shift for expanded applications (infrared imaging, communication, authentication) and sufficient light emission intensity.
Solution Approach 2:
The LiGa5O8 host lattice acts as an intermediary structure that facilitates efficient energy transfer from the Cr-Ni dopant complex to the emitted photons in the near infrared range. This host matrix mediates the interaction between the activator elements and the electromagnetic field, enabling high quantum efficiency and intense light emission at the target wavelength, thus resolving the trade-off between wavelength shift and intensity.
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 oxide fluorescent material achieves a light emission peak wavelength in the range of 1,150 nm to 1,300 nm with a full width at half maximum of 150 nm or more, providing higher light emission energy and enabling non-destructive measurement of internal information in living bodies and food products.
Implementation Method 1
a light emitting device including the oxide fluorescent material and a light emitting element that has a light emission peak wavelength in a range of 365 nm or more and 500 nm or less and irradiates the oxide fluorescent material
Data Source
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AI summary
To provide an oxide fluorescent material that has a light emission peak wavelength in a wavelength range of from red light to near infrared light. The oxide fluorescent material has a composition encompassed in a compositional formula represented by the following formula (1): (Li1-tM1t)u(Ga1-vM2v)5Ow:Crx,Niy)M3z (1) wherein in the formula (1), M1 represents at least one kind of an element selected from the group consisting of Na, K, Rb, and Cs; M2 represents at least one kind of an element selected from the group consisting of B, Al, Sc, In, and a rare earth element; M3 represents at least one kind of an element selected from the group consisting of Si, Ge, Sn, Ti, Zr, Hf, Bi, V, Nb, and Ta; and t, u, v, w, x, y, and z each satisfy 0 ≤ t ≤ 1.0, 0.7 ≤ u ≤ 1.6, 0 ≤ v < 1.0, 7.85 ≤ w ≤ 11.5, 0.05 ≤ x ≤ 1.2, 0 ≤ y ≤ 0.5, 0.25 < x+y ≤ 1.2, y < x, and 0 ≤ z ≤ 0.5.