Quantum Dot Optical Component for Solid State Lighting Spectral Deficiencies
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Solution Overview
Problem
Solid state lighting devices often suffer from spectral deficiencies, particularly in the red and cyan regions, leading to suboptimal color rendering indices and correlated color temperatures, which affect the lumens per watt efficiency and overall lighting quality.
Innovation Solution
Incorporating an optical component with quantum confined semiconductor nanoparticles that convert blue spectral light into specific predetermined wavelengths to supplement the spectral deficiencies, thereby enhancing the color rendering index and maintaining or improving lumens per watt efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional light sources are used to provide high lumens per watt efficiency, then energy efficiency is improved, but spectral deficiencies occur in red and cyan regions leading to poor color rendering
Solution Approach 1:
The patent combines conventional light-emitting materials with quantum confined semiconductor nanoparticles to create a composite optical material. This composite structure allows the system to maintain the high efficiency of conventional sources while adding the spectral conversion capability of quantum dots to fill red and cyan spectral deficiencies, thereby resolving the contradiction between energy efficiency and spectral completeness.
Solution Approach 2:
Quantum confined semiconductor nanoparticles act as an intermediary substance that converts blue light from the conventional source into red and cyan wavelengths. These nanoparticles serve as a mediating layer that transforms the spectral output without significantly reducing the overall lumens per watt efficiency, thus bridging the gap between efficient light generation and complete spectral coverage.
2Manufacturing precision
If optical components are added to convert blue light to red and cyan wavelengths, then color rendering index is improved, but device complexity increases
Solution Approach 1:
The patent merges the optical conversion function directly into the light source assembly by integrating quantum confined semiconductor nanoparticles into the optical material of the light source itself. This consolidation eliminates the need for separate external optical conversion components, thereby improving color rendering index while minimizing the increase in device complexity.
Solution Approach 2:
The quantum confined semiconductor nanoparticles perform multiple functions simultaneously: they convert blue light to red and cyan wavelengths for improved color rendering, maintain high lumens per watt efficiency, and can be integrated into various light source configurations. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in device complexity.
3Manufacturing precision
If quantum confined semiconductor nanoparticles are used for spectral conversion, then spectral deficiencies are compensated, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes the ability to precisely control the size and composition parameters of quantum confined semiconductor nanoparticles to tune their emission wavelengths. By adjusting these parameters during synthesis, manufacturers can precisely target the specific red and cyan wavelengths needed to compensate for spectral deficiencies, achieving high spectral output accuracy while using well-established nanoparticle synthesis techniques.
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 effectively increases the General Color Rendering Index and reduces correlated color temperature while maintaining or exceeding the lumens per watt efficiency of the light source, providing improved lighting quality and efficiency.
Implementation Method 1
an optical component that is positioned to receive at least a portion of light emitted from the light source, such that the optical component converts a portion of the light received by the optical component to one or more predetermined wavelengths
Data Source
AI summary
A solid state lighting device including a light source capable of emitting white light including a blue spectral component and having a deficiency in a spectral region, and an optical component that is positioned to receive at least a portion of the light generated by the light source, the optical component comprising an optical material for converting at least a portion of the blue spectral component of the light to one or more predetermined wavelengths such that light emitted by the solid state lighting device includes light emission from the light source supplemented with light emission at one or more predetermined wavelengths, wherein the optical material comprises quantum confined semiconductor nanoparticles. Also disclosed is lighting fixture, a cover plate for a lighting fixture and a method.