Light-Emitting Device With Phosphor Conversion and Optical Filtering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light-emitting devices struggle to effectively increase emission intensity of light in the wavelength range from red light to near-infrared light, which is crucial for applications such as infrared cameras, infrared communication, plant growth, vein authentication, and non-destructive sugar content measurement in food.
Innovation Solution
A light-emitting device comprising a light-emitting element that emits first light in the range of 200 nm to 550 nm, a light-emitting member with a resin and a light-emitting material that absorbs and emits second light in the range of 780 nm to 1100 nm, and an optical thin film that reflects the first light and transmits the second light, with specific integrated value ratios to enhance emission intensity in the desired wavelength range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light-emitting element emitting blue light (200-550 nm) is used, then the device can provide a light source for various applications, but the emission intensity in the red to near-infrared range (780-1100 nm) is insufficient
Solution Approach 1:
The patent applies parameter changes by selecting a specific phosphor material with emission peak wavelength of 780-1100 nm and controlling its content ratio to 250-500 parts by mass per 100 parts by mass of resin. This optimized composition enables efficient wavelength conversion from blue light to red/near-infrared light, achieving high emission intensity in the target range while maintaining a relatively simple device structure.
Solution Approach 2:
The patent uses composite materials by combining a blue light-emitting element with a resin-phosphor composite material. The phosphor-containing resin layer is formed on the light-emitting element, creating a composite structure that converts blue light (200-550 nm) to red/near-infrared light (780-1100 nm). This composite approach enables effective wavelength conversion while maintaining structural simplicity.
2Illumination intensity
If a light-emitting member with high phosphor content is used to increase red to near-infrared emission, then the emission intensity improves, but the manufacturing precision and uniformity become difficult to control
Solution Approach 1:
The patent controls the phosphor content within a specific range (250-500 parts by mass per 100 parts by mass of resin) to optimize both emission intensity and manufacturing precision. This parameter optimization ensures sufficient red/near-infrared emission while maintaining uniform light emission characteristics, preventing excessive phosphor aggregation that would compromise manufacturing quality.
Solution Approach 2:
The patent applies local quality by forming a phosphor-containing resin layer with specific compositional characteristics on the light-emitting element. The phosphor is distributed within the resin matrix to create a locally optimized structure that ensures uniform light emission while achieving high conversion efficiency from blue to red/near-infrared wavelengths.
3Adaptability or versatility
If the light-emitting device is designed for specific applications like vein authentication or sugar content measurement, then the functionality is improved, but the adaptability to other applications is reduced
Solution Approach 1:
The patent applies universality by designing a light-emitting device with a broad-spectrum phosphor that emits across the red to near-infrared range (780-1100 nm). This wavelength range covers multiple application needs including vein authentication (800-1000 nm), sugar content measurement (900-1100 nm), and other biometric or analytical applications, enabling a single device design to serve multiple functions without requiring wavelength-specific optimization.
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 device significantly increases emission intensity in the red to near-infrared range, enabling applications like vein authentication, biometric authentication, and non-destructive food quality measurement, while being suitable for miniaturized spectrometers and analytical instruments.
Implementation Method 1
a light-emitting material configured to emit second light having an emission peak wavelength in a range from 780 nm to 1100 nm, the light-emitting material being disposed on a light emission side of the light-emitting element and configured to absorb and emit at least part of the first light
Implementation Method 2
an optical thin film disposed on a light emission side of the light-emitting member and configured to reflect the first light and transmit the second light
Data Source
AI summary
A light-emitting device, a spectroscope, and a method for producing a light-emitting member are provided. A light-emitting device including: a light-emitting element configured to emit first light; a light-emitting member disposed on a light emission side of the light-emitting element and including a resin and a light-emitting material, the light-emitting material being configured to absorb the first light and configured to emit second light having an emission peak wavelength from 800 nm to 1100 nm; and an optical thin film disposed on a light emission side of the light-emitting member and configured to reflect the first light and transmit the second light. In an emission spectrum of the light-emitting device, a first integrated value ratio Ib/Ia that is an integrated value Ib of emission intensity at a wavelength in a range from 550 nm to 600 nm with respect to an integrated value Ia of emission intensity at a wavelength in a range from 200 nm to less than 550 nm is in a range from 0 to 0.05, and a second integrated value ratio Ic/Ia that is an integrated value Ic of emission intensity at a wavelength in a range from 800 nm to 1100 nm with respect to the integrated value Ia is in a range from 0.75 to 30.