Luminescent Composition for High Color Preference and LER
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Solution Overview
Problem
There is a need for a luminescent material that can simultaneously provide high color preference, as defined by a specific preference formula, and high Lumen Equivalent of Radiation (LER).
Innovation Solution
A luminescent composition comprising a first emitting material with a host lattice doped with Eu3+ ions, a second emitting material with a host lattice doped with Tb3+ ions, and a sensitizer material excitable in the violet to blue wavelength range, which overlaps with the excitation bands of both emitting materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a luminescent material is designed to provide high color preference according to the preference formula, then color rendering quality improves, but Lumen Equivalent of Radiation (LER) may be compromised
Solution Approach 1:
The patent employs a composite luminescent material system comprising multiple phosphors (first phosphor with first emission band, second phosphor with second emission band) combined with a blue light emitting component. This composite structure enables simultaneous optimization of color preference (through controlled emission bands in specific wavelength ranges) and LER (through efficient blue light emission), resolving the contradiction between color rendering quality and energy efficiency
Solution Approach 2:
The patent optimizes specific parameters including the wavelength ranges of emission bands (first emission band: 480-530nm, second emission band: 560-680nm), the ratios of phosphors to blue light emitting material, and the spectral power distribution characteristics. By carefully controlling these parameters, the invention achieves high color preference while maintaining high LER, as the blue light component provides efficient energy conversion
2Illumination intensity
If the luminescent composition uses multiple emitting materials with specific host lattices doped with Eu3+ and Tb3+ ions, then color preference is enhanced, but the device complexity increases
Solution Approach 1:
The patent combines multiple phosphor materials (Eu3+-doped host lattice and Tb3+-doped host lattice) with a blue light emitting component into a single integrated luminescent composition. This merging approach achieves the desired color preference through coordinated emission from multiple materials while simplifying the overall device structure, as all components can be incorporated into one phosphor conversion layer or coating
Solution Approach 2:
The blue light emitting component serves multiple functions: it provides the primary excitation source for both phosphors and contributes directly to the overall light output. The first phosphor (Eu3+-doped) and second phosphor (Tb3+-doped) each contribute different emission bands that together achieve high color preference. This multi-functionality reduces the need for additional separate components, thereby managing device 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
This composition enables the simultaneous achievement of high color preference and high LER, making it suitable for applications in lighting systems where both factors are critical.
Implementation Method 1
sensitizer material, which sensitizer material is excitable in the violet to blue (400 to 480 nm) wavelength range and has an emission spectrum which overlaps at least partly with one or more excitation bands of the first emitting material and which overlaps at least partly with one or more excitation bands of the second emitting material
Implementation Method 2
a first emitting material, said first emitting material having a host lattice doped with Eu3+ ions
Implementation Method 3
a second emitting material, said second emitting material having a host lattice doped with Tb3+ ions
Data Source
AI summary
The invention relates to lighting emitting devices and systems comprising a luminescent composition, said luminescent composition comprising: (i) a first emitting material, said first emitting material having a host lattice doped with EU3+ ions; (ii) a second emitting material, said second emitting material having a host lattice doped with Tb3+ ions; and (iii) sensitizer material, which sensitizer material is excitable in the violet-to-blue (400 to 480 nm) wavelength range and has an emission spectrum which overlaps at least partly with one or more excitation bands of the first emitting material and with which overlaps at least partly with one or more excitation bands of the second emitting material.