Light Emitting Arrangement with Deep Blue LED and Phosphor Layers
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Solution Overview
Problem
Conventional light-emitting diodes (LEDs) produce light in a relatively narrow spectral band, which limits their ability to achieve desired saturation of red and green colors, especially in small form factors suitable for accent lighting and narrow spaces.
Innovation Solution
A light-emitting arrangement combining a blue LED, a deep blue LED, a narrow band wavelength converting material, and a broadband wavelength converting material to produce white light with improved red and green saturation, utilizing chip-on-board technology to minimize size and eliminate the need for mixing chambers and multichannel drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional LEDs are used to provide white light, then the light conversion efficiency is improved, but the spectral composition is limited and red/green saturation is insufficient
Solution Approach 1:
The patent combines multiple LED types (violet LED at 405nm, blue LED at 450nm) with multiple phosphor materials (violet-to-yellow phosphor, blue-to-green phosphor, red phosphor) into a single integrated light-emitting arrangement. This merging of multiple light sources and wavelength-converting materials enables the system to achieve both high energy efficiency and superior spectral composition with saturated red and green color rendering.
2Illumination intensity
If multiple light sources and phosphors are combined to improve spectral composition, then red and green saturation is improved, but the device size increases
Solution Approach 1:
The patent employs thin-film phosphor layers deposited directly onto the LED chips and substrate surfaces. The violet-to-yellow phosphor, blue-to-green phosphor, and red phosphor are applied as thin films rather than bulk materials, significantly reducing the vertical thickness of the light-emitting arrangement while maintaining effective wavelength conversion and color saturation.
Solution Approach 2:
The patent transitions from a three-dimensional bulk arrangement to a two-dimensional planar integration by depositing phosphor layers directly on the LED chips and substrate. This dimensional change allows multiple phosphor materials to be integrated in a compact footprint, achieving high red and green saturation without increasing the overall device volume.
3Volume of moving object
If a compact light-emitting arrangement is designed for accent lighting, then the beam angle is reduced and space requirement is minimized, but the spectral quality may be compromised
Solution Approach 1:
The patent segments the light-emitting arrangement into distinct functional zones: violet LED chips for exciting violet-to-yellow and blue-to-green phosphors, blue LED chips for exciting blue-to-green and red phosphors, and separate phosphor layers for each wavelength conversion function. This segmentation allows each component to be optimized for its specific function while maintaining overall compactness and superior color rendering.
Solution Approach 2:
The patent uses composite phosphor materials including violet-to-yellow phosphor, blue-to-green phosphor, and red phosphor in specific combinations. These composite material systems enable the compact device to achieve full-spectrum white light with saturated red and green color rendering, proving that material composition can compensate for reduced physical size.
4Adaptability or versatility
If violet LED and blue LED are used together with multiple phosphors, then color temperature adjustability is improved, but the device complexity increases
Solution Approach 1:
The patent designs the light-emitting arrangement so that the same combination of violet LED, blue LED, and multiple phosphors serves multiple functions simultaneously: generating white light, achieving saturated red and green color rendering, enabling color temperature adjustment from warm to cool, and maintaining compact form factor. This multi-functionality reduces the need for separate systems for each function.
Solution Approach 2:
The patent enables color temperature adjustment by varying the relative intensities of the violet LED (405nm) and blue LED (450nm) sources, and by adjusting the thickness and composition ratios of the violet-to-yellow phosphor, blue-to-green phosphor, and red phosphor layers. These parameter changes allow continuous tuning of color temperature without requiring mechanical or electronic complexity.
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 enables a compact light-emitting arrangement that provides excellent red and green rendition with high saturation, suitable for accent lighting and narrow spaces, while allowing for homogeneous light emission and adjustable color temperature, enhancing color perception in retail environments.
Implementation Method 1
at least one narrow band wavelength converting material which is arranged to receive light emitted by the deep blue light-emitting element
Implementation Method 2
at least one broadband wavelength converting material which is arranged to receive light emitted by at least one of the blue light-emitting element and the at least one deep blue light-emitting element
Data Source
AI summary
A light-emitting arrangement (100) is disclosed, which is adapted to produce white output light enhancing the color perception of e.g. food in retail environments. The light-emitting arrangement comprises at least one blue light-emitting element (102) adapted to emit light having an emission peak in a first wavelength range of from 440 to 460 nm, and at least one deep blue light-emitting element (101) adapted to emit light having an emission peak in a second wavelength range of from 400 to 440 nm. Further, the light-emitting arrangement comprises at least one narrow band wavelength converting material (104) arranged to receive light emitted by said deep blue light-emitting element, and at least one broadband wavelength converting material (105) arranged to receive light emitted by at least one of said blue light-emitting element and said deep blue light-emitting element. A spotlight comprising such a light-emitting arrangement, and an illumination device comprising a plurality of the light-emitting arrangements, is also disclosed.