Red and Near-Infrared Light-Emitting Material for Simplified LED Packaging
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Solution Overview
Problem
Current near-infrared LED technologies face high costs and complex packaging processes due to the use of multiple near-infrared semiconductor chips, and there is a lack of materials that can be excited by wide-spectrum light sources to generate red and near-infrared light with high intensity and wide spectra.
Innovation Solution
A light-emitting material represented by the molecular formula xA2O3·yIn2O3·bR2O3, where A is Sc and Ga, and R includes Cr, Yb, or Er, which can be excited by ultraviolet-visible light to produce high-intensity wide-spectrum or multiple spectra, and a light-emitting device combining this material with a blue LED chip to simplify packaging and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple near-infrared semiconductor chips are used to achieve near-infrared light emission, then the near-infrared light source can be obtained, but the packaging process becomes complicated and the cost increases
Solution Approach 1:
The patent combines multiple light-emitting functions (red light and near-infrared light) into a single light-emitting material composition. This material can be excited by a single blue light source to simultaneously generate both red light and near-infrared light, eliminating the need for multiple separate chips and their complex packaging assembly.
Solution Approach 2:
The light-emitting material composition is designed to perform multiple functions: it can be excited by blue light to generate both red light emission and near-infrared light emission. This multi-functional material replaces what would traditionally require multiple specialized components, simplifying the overall device structure and packaging process.
2Illumination intensity
If multiple near-infrared semiconductor chips are used to achieve near-infrared light emission, then the near-infrared light source can be obtained, but the cost increases
Solution Approach 1:
The patent merges the functions of multiple near-infrared chips into a single light-emitting material composition that can generate near-infrared light when excited by blue light, thereby reducing the quantity of expensive semiconductor chips required.
Solution Approach 2:
The patent replaces expensive near-infrared semiconductor chips with a more cost-effective light-emitting material composition that can be excited by inexpensive blue light LEDs. This substitution significantly reduces the overall material cost while achieving the same near-infrared light emission function.
3Ease of manufacture
If a light-emitting material excited by blue light to generate red light and near-infrared light is used, then the packaging process is simplified and cost is reduced, but such a material with high luminescent intensity and wide spectrum was previously unavailable
Solution Approach 1:
The patent employs a composite light-emitting material composition containing multiple components (including In2O3, Ga2O3, and various metal oxides) that work synergistically to achieve both high luminescent intensity and wide spectral coverage. The composite structure allows the material to be excited by blue light and simultaneously generate red light and near-infrared light with sufficient intensity for practical applications.
Solution Approach 2:
The patent optimizes the compositional parameters of the light-emitting material, including the ratios of different metal oxides and the doping concentrations, to achieve the desired balance between luminescent intensity, spectral width, and excitation efficiency. By carefully adjusting these parameters, the material achieves reliable performance for security monitoring applications.
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 luminescent intensity and wide-spectrum emission, simplifying the packaging process and reducing costs by using a single blue light source for both red and near-infrared light emission, enhancing applications in security monitoring and other fields.
Implementation Method 1
there is still a lack of materials, which can be excited by near-ultraviolet-visible light sources, especially by a technically mature blue light source to generate red light and near-infrared light
Data Source
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Figure 3
AI summary
The present invention discloses a red light and near-infrared light-emitting material and a light-emitting device. The red light and near-infrared light-emitting material contains a compound represented by a molecular formula, xA2O3·yIn2O3·bR2O3, wherein the element A is Sc and/or Ga; the element R is one or two of Cr, Yb, Nd or Er and necessarily includes Cr; and 0.001≤x≤1, 0.001≤y≤1, 0.001≤b≤0.2, and 0.001≤b/(x+y)≤0.2.The light-emitting material can be excited by a technically mature blue light source to emit light with a high-intensity wide-spectrum or multiple spectra. Compared with existing materials, the light-emitting material has higher luminescent intensity. The light-emitting device uses an LED chip to combine an infrared light-emitting material and a visible light light-emitting material. In this way, the same LED chip can emit near-infrared light and visible light at the same time, which greatly simplifies the packaging process and reduces the packaging cost.