Solid State Emitter Packages Using Red and Blue LEDs
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Solution Overview
Problem
Existing solid state light emitters face challenges in output efficiency, thermal management, and controllability, particularly in applications like grow lights where high power and tailored light quality are needed, and they often lack effective solutions for enhancing color rendering index and efficacy.
Innovation Solution
A solid state emitter package comprising at least one principally red and one principally blue LED, without a green LED, utilizing a common leadframe, substrate, and reflector for enhanced color mixing, and optionally including supplemental emitters and lumiphoric materials to adjust spectral output and improve CRI, while independent current control allows for tailored light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If combined use of red, green, and blue LEDs is used to generate white emissions, then color rendering is improved, but efficacy decreases due to narrow FWHM wavelength ranges
Solution Approach 1:
The patent extracts the green LED component from the traditional RGB LED combination, using only red and blue LEDs to generate white light emissions. This eliminates the inefficiency of green LEDs with narrow FWHM (15-30 nm) while maintaining acceptable color rendering through spectral power distribution optimization in the 400-700 nm range.
Solution Approach 2:
The patent changes the spectral parameters by using red LEDs with FWHM of 50-100 nm and blue LEDs with FWHM of 30-60 nm, rather than the narrow 15-30 nm FWHM of traditional green LEDs. This parameter change improves efficacy while maintaining color rendering through broader spectral coverage.
2Adaptability or versatility
If green LEDs are included in the package, then complete RGB color coverage is achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent removes the green LED component from the package, simplifying the device structure while maintaining functional versatility. The red and blue LEDs alone can generate white light and provide sufficient color coverage for illumination applications, eliminating the need for complex green LED integration.
Solution Approach 2:
The red and blue LEDs serve multiple functions: they can be operated individually for specific wavelength applications, combined for white light generation, and their spectral overlap provides sufficient color coverage. This multi-functionality replaces the need for separate green LED components.
3Productivity
If high power LEDs are used for illumination applications, then luminous flux is improved, but thermal management becomes more difficult
Solution Approach 1:
The patent converts the harmful thermal effect into a beneficial selection criterion by choosing red LEDs (610-680 nm) and blue LEDs (435-485 nm) with higher operating temperatures that inherently tolerate higher power densities. The broader spectral width of these LEDs also improves extraction efficiency, reducing internal heating.
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 enhances light output quality and efficiency by eliminating the need for green LEDs, improving color rendering, and allowing for adjustable color and luminous flux, making it suitable for applications requiring specific spectral characteristics like grow lights.
Implementation Method 1
A solid state emitter package may include a plurality of solid state emitters, such as at least one principally red LED having a peak emission wavelength between 610 nm and 680 nm, and at least one principally blue LED having a peak emission wavelength between 435 nm and 485 nm
Implementation Method 2
The solid state emitter package may include lumiphoric materials, such as phosphors, arranged to interact with one or more of the solid state emitters
Data Source
AI summary
A solid state emitter package may include at least one electrically conductive path associated with the solid state emitter package that is not in electrical communication with any solid state emitter of the solid state emitter package, with such electrically conductive path being susceptible to inclusion of a jumper or a control element. A solid state emitter package includes a principally red solid state emitter having peak emissions within 590 nm to 680 nm, a principally blue solid state emitter having peak emissions within 400 nm to 480 nm, and at least one of a common leadframe, common substrate, and common reflector, with the package being devoid of any principally green solid state emitters having peak emissions between 510 nm and 575 nm.