Light Emitting Device Red Light Intensity CRI
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Solution Overview
Problem
Conventional light emitting elements have a low Color Rendering Index (CRI) due to weak red-based light emission, making it difficult to accurately display natural colors, which is a critical issue for illumination applications.
Innovation Solution
A light emitting device comprising at least one first light emitting element emitting light in the 400 to 500 nm range with a phosphor, and a second light emitting element emitting light in the 560 to 880 nm range, connected in series or parallel configurations, to enhance the intensity of red-based light and improve CRI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light emitting elements use blue-based light with wavelength converting phosphor or mix red, blue and green lights, then the device can be used for illumination, but the CRI property is lowered due to extremely weak red-based light intensity
Solution Approach 1:
The patent combines multiple light emitting elements with different spectral characteristics (blue-based LED with phosphor, red-based LED, green-based LED) into a single illumination device. This merging of multiple light sources with complementary spectral outputs enables the device to achieve high CRI by providing strong red-based light (560-880nm) while maintaining overall illumination effectiveness.
2Device complexity
If blue-based light is used with wavelength converting phosphor, then the device structure can be simplified, but the red-based light intensity becomes extremely weak
Solution Approach 1:
The patent merges a blue-based LED with wavelength converting phosphor (providing green and yellow light) with additional red-based LED elements. This combination compensates for the weak red output of phosphor-converted LEDs by adding dedicated red LED sources, thereby achieving high CRI without overly complicating the device structure.
Solution Approach 2:
The patent applies different light emitting technologies to different spectral regions: blue-based LED with phosphor for the blue-green-yellow region, and dedicated red-based LEDs for the red region. This local optimization ensures that each spectral region is covered by the most appropriate light source, achieving high overall CRI.
3Reliability
If red, blue and green light emitting elements are mixed to achieve better CRI, then the red-based light intensity is improved, but the device complexity increases
Solution Approach 1:
The patent integrates red, green, and blue light emitting elements into a unified illumination device with common electrical connections and housing. This merging approach achieves high CRI through comprehensive spectral coverage while managing device complexity through integrated design and shared structural components.
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 enhanced red-based light intensity allows for better color representation, significantly improving the CRI property, making LEDs suitable for illumination purposes.
Implementation Method 1
at least one first light emitting element including at least one light emitting chip for emitting light having a wavelength of 400 to 500 nm and a phosphor
Data Source
AI summary
The disclosed light emitting device comprises at least one first light emitting element including at least one light emitting chip for emitting light having a wavelength of 400 to 500 nm and a phosphor; and at least one second light emitting element disposed adjacent to the first light emitting element to emit light having a wavelength of 560 to 880 nm.