Oxide Phosphor Near-Infrared Emission Composition
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Solution Overview
Problem
Light sources used in small analytical instruments for medical and food product applications require emission peaks in the near-infrared range exceeding 720 nm, which existing phosphors, such as chromium-activated gallate, cannot adequately provide, especially for applications like non-destructive food quality analysis and in vivo information retrieval.
Innovation Solution
An oxide phosphor composition containing Mg, Ga, O, and Cr, optionally with additional elements like Ca, Sr, Ba, Ni, Zn, B, Al, In, Sc, Eu, Ce, Tb, Pr, Nd, Sm, Yb, Ho, Er, Tm, and Mn, with specific molar ratios, that emits light in the range of 800 nm to 1600 nm when excited, and a light-emitting device incorporating this phosphor with a light emission peak in the range of 365 nm to 500 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If chromium-activated gallate phosphor is used, then light emission in the red light range (660 nm to 720 nm) is achieved, but light emission in the near-infrared range exceeding 720 nm cannot be provided
Solution Approach 1:
The patent changes the chemical composition parameters of the phosphor by incorporating magnesium, gallium, and chromium in specific molar ratios to shift the emission peak from the red light range (660-720 nm) to the near-infrared range (800-1600 nm), enabling broader application versatility
Solution Approach 2:
The patent creates a composite phosphor material combining multiple elements (Mg, Ga, Cr, and optional M1/M2/M3 elements) to achieve near-infrared emission, overcoming the limitation of single-element chromium-activated gallate that only emits in the red light range
2Illumination intensity
If existing phosphors are used, then simple composition is maintained, but near-infrared emission capability is insufficient
Solution Approach 1:
The patent introduces optional local compositional variations by allowing specific elements (M1 from Ca, Sr, Ba, Ni, Zn; M2 from B, Al, In, Sc; M3 from rare earth elements) to be incorporated in controlled amounts, enabling fine-tuning of near-infrared emission properties without completely redesigning the base composition
3Illumination intensity
If phosphor composition is optimized for near-infrared emission, then light emission peak wavelength of 800 nm or greater is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent establishes specific parameter ranges for molar ratios (Mg: 0.7-1.3, Cr: >0.02-0.3, O: 3.7-4.3) that define the optimal composition window for near-infrared emission, balancing manufacturing feasibility with performance requirements
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 phosphor enables light emission in the near-infrared range of 800 nm to 1600 nm, facilitating non-destructive analysis of food products and in vivo information retrieval with improved visibility and color rendering properties.
Implementation Method 1
an oxide phosphor having a composition containing Mg, Ga, O (oxygen), and Cr... in a light emission spectrum of the phosphor, the oxide phosphor has a light emission peak wavelength in a range of 800 nm to 1600 nm
Data Source
AI summary
Provided is an oxide phosphor having a light emission peak wavelength of 800 nm or greater. The oxide phosphor has a composition containing Mg, Ga, O, and Cr, and optionally containing a first element M1, a second element M2, and a third element M3. When a total molar ratio of Ga, Cr, the second element M2, and the third element M3 per mole of the composition of the oxide phosphor is 2, the molar ratio of Mg or the molar ratio of a total of Mg and the first element M1 is in a range from 0.7 to 1.3, the molar ratio of O is in a range of 3.7 to 4.3, and the molar ratio of Cr is in a range greater than 0.02 and 0.3 or less. The oxide phosphor has a light emission peak wavelength in a range of 800 nm to 1600 nm in a light emission spectrum.