Optoelectronic Component Refractive Index via Nanoparticles
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Solution Overview
Problem
Current optoelectronic components, such as white light-emitting diodes, experience energy losses due to total internal reflection and light scattering at the interface between the LED and encapsulating matrix, which can be mitigated by increasing the refractive index of the matrix material.
Innovation Solution
Incorporating filler nanoparticles with a diameter of less than 15 nm into a reactive polysiloxane matrix material to enhance the refractive index, thereby reducing light losses and improving the efficiency of the conversion element in optoelectronic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the refractive index of the phosphor matrix material is increased, then the efficiency of the phosphor-converting LED is improved, but the complexity of the matrix material composition increases
Solution Approach 1:
The patent applies parameter changes by systematically varying the refractive index of the matrix material through controlled addition of filler nanoparticles with specific refractive indices. This allows optimization of the refractive index parameter to achieve maximum LED efficiency while maintaining a manageable material composition through controlled formulation
Solution Approach 2:
The patent uses inexpensive filler nanoparticles that can be readily incorporated into the polysiloxane matrix. These simple, cost-effective nanoparticles provide the necessary refractive index modification without requiring complex or expensive specialized materials, thereby improving efficiency while keeping the system simple and economical
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 increased refractive index leads to higher light output and efficiency in optoelectronic components by minimizing energy losses associated with total internal reflection and light scattering, resulting in enhanced performance compared to traditional materials.
Implementation Method 1
The first loss occurs due to a total internal reflection on the interface between the LED and encapsulation matrix material which is proportional to the ratio of the refractive index of the LED material... and that of the phosphor matrix material... increasing the refractive index of the matrix material is expected to reduce both types of light losses
Implementation Method 2
The phosphor absorbs at least partially a fraction of the blue light and emits light in the range of 500 to 700 nm in a process commonly referred to as down conversion
Data Source
AI summary
An optoelectronic component includes a semiconductor chip that is able to emit radiation having a wavelength of 400 nm to 490 nm, a conversion element including a reactive polysiloxane matrix material, a wavelength converting phosphor and filler nanoparticles, wherein the filler nanoparticles have a diameter of smaller than 15 nm and modify the refractive index and yield a mixture when added to the reactive polysiloxane matrix material.