Eu3+-Doped Uranium Phosphor Composition for High-CRI 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.
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 horticultural applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional phosphor materials are used for LED lighting, then the device complexity is low, but the quantum efficiency and energy transfer efficiency are insufficient
Solution Approach 1:
The patent employs composite phosphor materials consisting of uranium-based host lattices doped with Eu3+ ions, combining multiple functional components into a single integrated material system that achieves both high energy transfer efficiency and practical device compatibility
Solution Approach 2:
The patent optimizes the chemical composition parameters of the phosphor material, specifically controlling the ratios of Ba, Sr, Ca, Mg, Zn, U, P, V, and Eu3+ to achieve optimal energy transfer efficiency and quantum efficiency while maintaining manufacturability
2Illumination intensity
If phosphor materials with high absorption coefficients are used in thin films for micro-LED displays, then the color gamut coverage is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent enhances the local optical properties of the phosphor material by incorporating Eu3+ ion doping at specific concentrations within the uranium-based host lattice, creating regions of high absorption coefficient that improve color gamut coverage while maintaining overall film uniformity
Solution Approach 2:
The composite phosphor structure combines the uranium-based host lattice with Eu3+ dopant ions, creating a material with enhanced local absorption properties that improves color gamut coverage in thin film configurations without compromising manufacturing feasibility
3Use of energy by moving object
If blue LED emission is used for lighting, then the efficacy is high, but the hazardous blue light emission increases
Solution Approach 1:
The uranium-based phosphor material acts as an intermediary that converts the high-efficacy blue LED emission into green and red light through photoluminescence, thereby maintaining lighting efficacy while eliminating the harmful blue light component
Solution Approach 2:
The patent converts the potentially harmful blue light emission into beneficial green and red light wavelengths through the photoluminescence properties of the Eu3+-doped uranium-based phosphor, transforming a harmful factor into a useful outcome
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 and spectral overlap with human eye sensitivity, enabling the creation of lighting with enhanced color gamut and reduced hazardous blue light emission, suitable for both display and horticultural applications.
Implementation Method 1
The phosphor is doped with Eu3+ and exhibits efficient energy transfer and high quantum efficiency, enabling the production of narrow band green emission
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.