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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.
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.
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%).
Low Transition Metal Impurities: Strict purification reduces Fe, Co, and Ni levels to <5 ppm, preventing luminescence quenching in optoelectronic applications.
Uniform Particle Size: Available in submicron (0.5-1 μm) and micron-scale (2-5 μm) grades, optimizing packing density in phosphor blends.
Stable Hydration State: Maintains ten crystal water molecules under ambient conditions (25°C, 50% RH), ensuring consistent stoichiometry for precise material synthesis.
In display technologies, europium compounds are used in the red fluorescent layers of plasma displays and field-emission displays. They provide bright, saturated red tones, maintain color stability over long operational lifetimes, and improve overall visual performance for high-definition imaging applications.
Europium-based materials function as standard reference reagents in fluorescence spectroscopy. They enable accurate calibration of analytical instruments for detecting trace europium concentrations in environmental and industrial samples, supporting high-precision measurements in chemical analysis and environmental monitoring.
Europium is widely used in research for synthesizing europium-doped glass fibers for optical amplifiers. These fibers enhance signal strength and transmission efficiency in the 1.3–1.5 μm telecommunications band, playing a key role in high-speed, long-distance fiber-optic communication systems.
In ceramic and enamel applications, europium provides permanent red coloration for glazes and decorative coatings. It maintains hue stability at firing temperatures up to 1200°C, ensuring consistent aesthetic quality and long-term durability for advanced ceramic products and high-temperature decorative materials.
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.
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.
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%).
Low Transition Metal Impurities: Strict purification reduces Fe, Co, and Ni levels to <5 ppm, preventing luminescence quenching in optoelectronic applications.
Uniform Particle Size: Available in submicron (0.5-1 μm) and micron-scale (2-5 μm) grades, optimizing packing density in phosphor blends.
Stable Hydration State: Maintains ten crystal water molecules under ambient conditions (25°C, 50% RH), ensuring consistent stoichiometry for precise material synthesis.
In display technologies, europium compounds are used in the red fluorescent layers of plasma displays and field-emission displays. They provide bright, saturated red tones, maintain color stability over long operational lifetimes, and improve overall visual performance for high-definition imaging applications.
Europium-based materials function as standard reference reagents in fluorescence spectroscopy. They enable accurate calibration of analytical instruments for detecting trace europium concentrations in environmental and industrial samples, supporting high-precision measurements in chemical analysis and environmental monitoring.
Europium is widely used in research for synthesizing europium-doped glass fibers for optical amplifiers. These fibers enhance signal strength and transmission efficiency in the 1.3–1.5 μm telecommunications band, playing a key role in high-speed, long-distance fiber-optic communication systems.
In ceramic and enamel applications, europium provides permanent red coloration for glazes and decorative coatings. It maintains hue stability at firing temperatures up to 1200°C, ensuring consistent aesthetic quality and long-term durability for advanced ceramic products and high-temperature decorative materials.
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.
