Green Fluorescent Powder for White Light LEDs
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Solution Overview
Problem
Current green fluorescent powders for white light LEDs lack alternatives, which hinders their development and affects the quality of liquid crystal displays, as they influence the color rendering index and color gamut.
Innovation Solution
A fluorescent powder comprising an inorganic compound with specific elements (Eu, Ce, Mn, Tb, Dy, Tm; Mg, Ca, Sr, Ba; B, Al, Ga, In, La, Gd, Sc, Lu; Si, Ge, Zr, Hf; N, O, F, Cl) that emits visible light within 510 nm to 550 nm, providing a new alternative for green fluorescent powders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional green fluorescent powders (such as Sr-Al-Si-N-O compounds activated by Eu or Ce) are used, then the color rendering index and color gamut of white light LEDs can be improved, but the lack of alternative materials hinders further development and limits adaptability
Solution Approach 1:
The patent employs composite material strategy by combining multiple elements (M, A, D, E, R) in specific proportions to create a new fluorescent powder composition. The compound integrates rare earth elements (Eu, Ce, Mn, Tb, Dy, Tm) with base metals (Mg, Ca, Sr, Ba) and non-metals (B, Al, Ga, In, La, Gd, Sc, Lu; Si, Ge, Zr, Hf; N, O, F, Cl) to form a composite structure that achieves both improved adaptability and controlled complexity through systematic element selection and ratio optimization
2Illumination intensity
If the fluorescent powder composition is optimized for specific emission wavelengths (510 nm to 550 nm), then the brightness and performance of white light LEDs are enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by systematically varying the proportions of elements M, A, D, E, and R within specific ranges to optimize emission wavelength and brightness. The composition formula MaAbDcEdRe with controlled parameter ranges (0.0001≤a≤0.5, 0.5≤b≤1.5, 0.5≤c≤1.5, 3≤d≤6, 7≤e≤14) enables tuning of optical properties while managing manufacturing precision through defined compositional windows rather than fixed ratios
3Adaptability or versatility
If new element combinations are introduced to provide alternatives for green fluorescent powder, then more options for white light LED development become available, but the difficulty of detecting and measuring optimal compositions increases
Solution Approach 1:
The patent applies segmentation by dividing the complex multi-element system into distinct element groups (M: rare earth activators, A: base metals, D: metalloids, E: non-metals, R: anions) with assigned functional roles. This segmentation allows systematic optimization of each element group independently while simplifying the detection and measurement process through grouped elemental analysis rather than treating all elements as a single complex mixture
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 proposed fluorescent powder enhances the brightness and stability of white light LEDs, improving their performance and adaptability, and supports the development of more advanced LED technologies.
Implementation Method 1
The fluorescent powder contains an inorganic compound... which emits visible light within 510 nm to 550 nm
Data Source
AI summary
The present disclosure relates to a fluorescent powder and a light-emitting device including the same. The fluorescent powder includes an inorganic compound. The inorganic compound contains components including an element M, an element A, an element D, an element E, and an element R. The element M is selected from Eu, Ce, Mn, Tb, Dy, and Tm, the element A is selected from Mg, Ca, Sr, and Ba, the element D is selected from B, Al, Ga, In, La, Gd, Sc, Lu, and Y, the element E is selected from Si, Ge, Zr, and Hf, and the element R is at least two elements selected from N, O, F, and Cl. In a powder X-Ray Diffraction (XRD) spectrum with CoKα radiation, the inorganic compound at least has diffraction peaks within ranges of an Bragg angle (2θ) from 27.3° to 28.3°, 29.7° to 30.7°, 41.9° to 42.9°, and 43.5° to 44.5°.