Light-Converting Material Nanoparticle Surface Coating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current light-converting materials for LEDs, particularly those using semiconductor nanoparticles and conventional phosphors, face issues such as high reabsorption, separation effects leading to reduced energy efficiency and inadequate color reproduction, and limited flexibility in production processes.
Innovation Solution
A light-converting material comprising semiconductor nanoparticles applied to the surface of unactivated crystalline materials, which improves miscibility with conventional phosphors, reduces reabsorption, and enhances energy efficiency, allowing for more targeted color setting and increased brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If semiconductor nanoparticles are used as light-converting material, then energy efficiency is improved, but reabsorption of emitted light occurs which reduces overall efficiency
Solution Approach 1:
An unactivated crystalline material is introduced as an intermediary between the semiconductor nanoparticles and the final light output. This intermediary has high transparency in the visible range and does not absorb the light emitted by the semiconductor nanoparticles, thereby preventing reabsorption losses while maintaining the high energy efficiency of the nanoparticle conversion
Solution Approach 2:
The patent creates distinct functional zones: semiconductor nanoparticles are positioned specifically where UV/blue light conversion is needed, while the unactivated crystalline material provides a transparent matrix that allows light to pass through without absorption. Each material is placed where it provides its specific advantage without causing harmful effects
2Illumination intensity
If conventional phosphors are used for white light generation, then yellow light is produced, but the light has poor color reproduction properties due to lack of green and red emission
Solution Approach 1:
The patent combines semiconductor nanoparticles with specific emission wavelengths (green and red) with the unactivated crystalline material to create a composite light-converting system. This composite approach enables simultaneous emission across multiple spectral regions (blue from LED, green from nanoparticles, red from nanoparticles), achieving superior color reproduction compared to conventional single-phosphor yellow converters
3Loss of energy
If semiconductor nanoparticles are mixed with conventional phosphors, then light conversion is improved, but separation occurs during production which reduces homogeneity
Solution Approach 1:
The unactivated crystalline material serves as a stable matrix or intermediary that hosts the semiconductor nanoparticles. This matrix provides structural stability and prevents separation during production and operation, while maintaining the high light conversion efficiency of the nanoparticle-phosphor combination through proper spatial distribution
4Illumination intensity
If red phosphors emit light deep into the long-wave red spectral region, then red color is achieved, but brightness of LEDs is reduced and efficiency decreases
Solution Approach 1:
The patent modifies the emission parameters of the red light component by using semiconductor nanoparticles with optimized bandgap properties. These nanoparticles emit in the red region but with different spectral characteristics than conventional phosphors, achieving red color while maintaining higher brightness and energy efficiency through reduced reabsorption and optimized emission 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 solution results in improved energy efficiency, stability, and predictability of the LED spectrum, enabling flexible use and increased brightness while avoiding energy losses in the long-wave spectral region, thus facilitating better color reproduction and production efficiency.
Implementation Method 1
semiconductor nanoparticles (quantum materials) which are capable of converting at least some of the light originally emitted by a light source of the device into light having a longer wavelength
Data Source
AI summary
The present invention relates to light-converting materials which comprise semiconductor nanoparticles and an unactivated crystalline material, where the semiconductor nanoparticles are located on the surface of the unactivated crystalline material. The present invention furthermore relates to the use of the light-converting material in a light source. The present invention furthermore relates to a light-converting mixture, to a light source, to a lighting unit which contains the light-converting material according to the invention, and to a process for the production of the light source.