Red and Near-Infrared Phosphor Composition for Blue-Light Excitation
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Solution Overview
Problem
Current red and near-infrared light-emitting materials lack the ability to be excited by ultraviolet, blue, and red light sources, particularly blue light sources, and have low luminescent intensity and narrow spectral ranges, making them unsuitable for applications in security monitoring, biometrics, and medical detection.
Innovation Solution
A red and near-infrared light-emitting material with a compound formula aSc2O3·Ga2O3·bR2O3, where R includes Cr, Ni, Fe, Yb, Nd, or Er, and a crystal structure similar to β-Ga2O3, which can be excited by ultraviolet, blue, and red light sources to emit a wide spectrum of 650 nm to 1700 nm, achieved through a high-temperature sintering process and subsequent processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If existing red and near-infrared light-emitting materials are used, then they can emit light in specific narrow spectral ranges, but they have low luminescent intensity and cannot be excited by blue light sources
Solution Approach 1:
The patent employs a composite phosphor system combining multiple phosphor materials with different excitation characteristics. The first phosphor material responds to blue light excitation while the second phosphor material extends emission into the near-infrared region, creating a composite material that achieves both high luminescent intensity under blue light excitation and broad spectral coverage from red to near-infrared wavelengths.
Solution Approach 2:
The composite phosphor formulation is designed to be universally excitable by blue light sources while simultaneously providing multiple emission functions. The first phosphor material converts blue light to red emission, and the second phosphor material converts blue light to near-infrared emission, making the composite material multi-functional in terms of emission spectrum while maintaining compatibility with a single blue light excitation source.
2Adaptability or versatility
If existing light-emitting materials with narrow spectral ranges are used, then they can be manufactured with simple compositions, but they cannot provide wide spectrum emission from 650 nm to 1050 nm
Solution Approach 1:
The patent utilizes a composite phosphor system where the first phosphor material provides red light emission in the 600-650 nm range and the second phosphor material provides near-infrared emission in the 700-1050 nm range. This composite approach enables broad spectral coverage from 650 nm to 1050 nm while maintaining a relatively simple two-component formulation that can be integrated into a single light-emitting device.
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 material achieves high-intensity wide-spectrum emission of red and near-infrared light, overcoming the limitations of existing materials by providing higher luminescent intensity and broader spectral coverage, suitable for diverse detection technologies.
Implementation Method 1
the phosphor may emit red light with a spectrum of 600 nm to 800 nm under the excitation of ultraviolet light
Implementation Method 2
a fluorescence-converted near-infrared technology has been developed rapidly
Data Source
AI summary
Disclosed are a red light and near-infrared light-emitting material and a preparation method thereof, and a light-emitting device including the light-emitting material. The red light and near-infrared light-emitting material contains a compound represented by a molecular formula, aSc2O3·Ga2O3·bR2O3, wherein the element R includes one or two of Cr, Ni, Fe, Yb, Nd or Er; 0.001≤a≤0.6; and 0.001≤b≤0.1. The light-emitting material can be excited by a spectrum having a wide wavelength range (ultraviolet light or purple light or blue light) to emit light with a wide spectrum of 650 nm to 1700 nm or multiple spectra, thus having higher light-emitting intensity.