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Europium Sulfate (Eu₂(SO₄)₃·10H₂O) is a pale pink crystalline powder celebrated for its role in producing vibrant red-emitting phosphors and high-purity europium compounds. With a CAS number of 10031-55-1 and a molecular weight of 766.10 g/mol (hydrated form), this compound offers purity levels of 99.9%-99.99% (4N), featuring low solubility in water (0.05 g/L at 25°C) and excellent thermal decomposability. Its Eu³+ ions' strong f-f transitions make it indispensable in display technologies and analytical chemistry.
1. Intense Red Luminescence: Eu³+ ions emit a sharp red peak at 613 nm when excited by UV or blue light, critical for color-converting phosphors in LED and CRT displays.
2. Controlled Thermal Release: Releases crystal water at 150-200°C and decomposes to Eu₂O₃ at 600-700°C, yielding an oxide powder with high quantum efficiency (≥90%).
3. Low Transition Metal Impurities: Strict purification reduces Fe, Co, and Ni levels to <5 ppm, preventing luminescence quenching in optoelectronic applications.
4. Uniform Particle Size: Available in submicron (0.5-1 μm) and micron-scale (2-5 μm) grades, optimizing packing density in phosphor blends.
5. Stable Hydration State: Maintains ten crystal water molecules under ambient conditions (25°C, 50% RH), ensuring consistent stoichiometry for precise material synthesis.
• LED Lighting: A key component in red phosphors (e.g., Eu³+-doped Y2O3:Eu), combining with blue chips and green phosphors to achieve white light with high color rendering index (CRI > 95).
• Display Technologies: Used in the red fluorescent layer of plasma displays and field-emission displays, providing saturated red tones with long operational life.
• Analytical Reagents: Serves as a standard reference material for fluorescence spectroscopy, calibrating instruments to measure trace europium concentrations in environmental samples.
• Research & Development: Used in the synthesis of europium-doped glass fibers for optical amplifiers, enhancing signal strength in the 1.3-1.5 μm telecommunications band.
• Ceramic Pigments: Adds permanent red coloration to glazes and enamels, maintaining hue stability at firing temperatures up to 1200°C.
Q: Why is europium sulfate preferred over europium oxide for phosphor synthesis?
A: Sulfate provides more uniform Eu³+ ion distribution during co-precipitation, reducing agglomeration and improving light extraction efficiency.
Q: What is the optimal excitation wavelength for Eu³+ emission?
A: Maximum excitation occurs at 395 nm (UV-A) and 465 nm (blue), making it compatible with both traditional UV chips and modern blue LED sources.
Q: Can it be used in anti-counterfeiting inks?
A: Yes, europium-based phosphors exhibit strong red fluorescence under UV light, ideal for security printing on banknotes and product labels.
Q: How does humidity affect the storage of Europium Sulfate?
A: Store in airtight containers with desiccants; prolonged exposure to >60% RH may cause slight hydration layer growth, but luminescent properties remain unaffected.
Q: Is there a food-grade version available for packaging applications?
A: While not approved for direct food contact, 4N-grade products meet strict purity standards for indirect applications like food-safe coatings.
Europium Sulfate (Eu₂(SO₄)₃·10H₂O) is a pale pink crystalline powder celebrated for its role in producing vibrant red-emitting phosphors and high-purity europium compounds. With a CAS number of 10031-55-1 and a molecular weight of 766.10 g/mol (hydrated form), this compound offers purity levels of 99.9%-99.99% (4N), featuring low solubility in water (0.05 g/L at 25°C) and excellent thermal decomposability. Its Eu³+ ions' strong f-f transitions make it indispensable in display technologies and analytical chemistry.
1. Intense Red Luminescence: Eu³+ ions emit a sharp red peak at 613 nm when excited by UV or blue light, critical for color-converting phosphors in LED and CRT displays.
2. Controlled Thermal Release: Releases crystal water at 150-200°C and decomposes to Eu₂O₃ at 600-700°C, yielding an oxide powder with high quantum efficiency (≥90%).
3. Low Transition Metal Impurities: Strict purification reduces Fe, Co, and Ni levels to <5 ppm, preventing luminescence quenching in optoelectronic applications.
4. Uniform Particle Size: Available in submicron (0.5-1 μm) and micron-scale (2-5 μm) grades, optimizing packing density in phosphor blends.
5. Stable Hydration State: Maintains ten crystal water molecules under ambient conditions (25°C, 50% RH), ensuring consistent stoichiometry for precise material synthesis.
• LED Lighting: A key component in red phosphors (e.g., Eu³+-doped Y2O3:Eu), combining with blue chips and green phosphors to achieve white light with high color rendering index (CRI > 95).
• Display Technologies: Used in the red fluorescent layer of plasma displays and field-emission displays, providing saturated red tones with long operational life.
• Analytical Reagents: Serves as a standard reference material for fluorescence spectroscopy, calibrating instruments to measure trace europium concentrations in environmental samples.
• Research & Development: Used in the synthesis of europium-doped glass fibers for optical amplifiers, enhancing signal strength in the 1.3-1.5 μm telecommunications band.
• Ceramic Pigments: Adds permanent red coloration to glazes and enamels, maintaining hue stability at firing temperatures up to 1200°C.
Q: Why is europium sulfate preferred over europium oxide for phosphor synthesis?
A: Sulfate provides more uniform Eu³+ ion distribution during co-precipitation, reducing agglomeration and improving light extraction efficiency.
Q: What is the optimal excitation wavelength for Eu³+ emission?
A: Maximum excitation occurs at 395 nm (UV-A) and 465 nm (blue), making it compatible with both traditional UV chips and modern blue LED sources.
Q: Can it be used in anti-counterfeiting inks?
A: Yes, europium-based phosphors exhibit strong red fluorescence under UV light, ideal for security printing on banknotes and product labels.
Q: How does humidity affect the storage of Europium Sulfate?
A: Store in airtight containers with desiccants; prolonged exposure to >60% RH may cause slight hydration layer growth, but luminescent properties remain unaffected.
Q: Is there a food-grade version available for packaging applications?
A: While not approved for direct food contact, 4N-grade products meet strict purity standards for indirect applications like food-safe coatings.
