Eu3+-Doped Uranium Phosphor Composition for Teal-Gap Lighting
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Solution Overview
Problem
Current phosphor materials for LED lighting and display applications lack efficient energy transfer and high quantum efficiency, particularly in sensitizing Europium emission, which is essential for achieving high efficacy and color rendering index (CRI) values, and fail to provide a full spectrum of light that matches human eye sensitivity.
Innovation Solution
The development of uranium-based phosphor materials, specifically doped with Eu3+ ions, which exhibit efficient energy transfer and high quantum efficiency, enabling the production of narrow band green emission and tunable spectra for human-centric lighting and horticulture applications, by incorporating the uranyl ion as a sensitizer and lanthanide activator ions like Europium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional phosphor materials are used for LED lighting, then the device structure is simple, but the energy transfer efficiency and quantum efficiency are low
Solution Approach 1:
The patent employs composite phosphor materials combining uranium-based host structures with multiple dopant ions (Eu3+, Mn4+, Ce3+) to achieve high energy transfer efficiency. The composite structure allows synergistic energy transfer between different ions, where the uranium-based host provides efficient energy absorption and transfer pathways to the activator ions, resolving the contradiction between energy efficiency and material simplicity.
Solution Approach 2:
The patent optimizes dopant concentrations and ratios (e.g., Eu3+ at 0.01-5 mol%, Mn4+ at 0.01-5 mol%) to maximize energy transfer efficiency. By precisely controlling compositional parameters of the phosphor materials, the invention achieves high quantum efficiency without requiring overly complex multi-component systems, thus balancing energy efficiency with compositional simplicity.
2Illumination intensity
If multiple phosphors are used to achieve full spectrum lighting, then the color rendering index improves, but the device complexity increases
Solution Approach 1:
The patent develops multi-functional phosphor materials that can simultaneously provide multiple emission bands (violet, blue, green, yellow-green, red) through a single phosphor composition. The uranium-based host with multiple dopants acts as a universal light converter that covers the entire visible spectrum, eliminating the need for separate phosphor layers and simplifying the overall LED lighting structure while maintaining high CRI.
Solution Approach 2:
The invention merges multiple emission functions into a single phosphor material by combining different dopant ions within one uranium-based host structure. This consolidation approach integrates violet (Mn4+), blue (Ce3+), green (Eu3+), yellow-green, and red (Mn4+) emissions into one unified phosphor component, reducing device complexity while achieving full spectrum coverage and high color rendering index.
3Length of moving object
If thin phosphor layers are used for micro-LED displays, then the display resolution improves, but the absorption coefficient requirement increases
Solution Approach 1:
The patent utilizes the unique optical parameters of uranium-based phosphors, which exhibit strong absorption coefficients in the UV-blue region due to f-f transitions of Eu3+ ions. By optimizing the phosphor layer thickness to 1-10 micrometers and controlling dopant concentrations, the invention achieves sufficient light absorption in ultra-thin layers, enabling high-resolution micro-LED displays while maintaining reliable energy conversion efficiency.
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
These uranium-based phosphors provide high efficacy lighting with improved CRI values, fill the teal gap in human-centric lighting, and offer a single phosphor solution for both green and red emissions, enhancing display gamut and plant growth lighting without the need for multiple phosphors.
Implementation Method 1
efficient energy transfer
Implementation Method 2
narrow band green emission
Implementation Method 3
high quantum efficiency
Implementation Method 4
enabling the production of narrow band green emission
Implementation Method 5
fill the teal gap in human-centric lighting
Data Source
AI summary
A phosphor composition includes an activated uranium-based phosphor having formula I or II. The phosphor is doped with Eu3+[Ba1−a−bSraCab]x[Mg,Zn]y(UO2)z([P,V]O4)2(x+y+z)/3 (I)[Ba1−a−bSraCab]p(UO2)q[P,V]rO(2p+2q+5r)/2 (II)where 0≤a≤1, 0≤b≤1, 0.75≤x≤1.25, 0.75≤y≤1.25, 0.75≤z≤1.25, 2.5≤p≤3.5, 1.75≤q≤2.25, and 3.5≤r≤4.5 and formula II excludes the combination where a is 0, b is 0, p is 3.5, q is 1.75, and r is 3.5. Phosphor compositions further including formula VI or other luminescent materials, such as quantum dots, devices and displays are also provided.