Strontium Aluminate Doped with Europium, SrAl2O4 with 3 wt% Eu
Europium-doped strontium aluminate (SrAl2O4:Eu) is an oxide-host photoluminescent ceramic supplied as a sputtering target by Infinita Materials for depositing green-emitting phosphor thin films. The Eu2+ activator substitutes into the monoclinic SrAl2O4 lattice to produce efficient visible photoluminescence under UV/near-UV excitation, making this target class of interest for luminescent coatings, optical sensing layers, and thin-film phosphor research.
Introduction to Europium-Doped Strontium Aluminate
SrAl₂O₄ is a Eu²⁺-doped aluminate phosphor with a monoclinic P2₁ structure built from corner-sharing AlO₄ tetrahedra and two distinct Sr²⁺ sites. Eu²⁺ substitutes for Sr²⁺, producing characteristic broadband green-to-blue-green photoluminescence through 4f–5d transitions. The host is a wide-bandgap, electrically insulating oxide with strong thermal and chemical stability. RF magnetron sputtering from ceramic SrAl₂O₄ targets enables controlled stoichiometry and uniform, adherent thin films while helping maintain the Eu²⁺/Eu³⁺ balance critical to luminescence. These films are used in electroluminescent and photoluminescent devices, optical down-shifting layers, spectral-conversion coatings, luminescent sensors, and UV-readable security or identification markings.
Answer: A doping level of 3 wt% Europium balances brightness, afterglow duration, and material stability, making it ideal for a wide range of photoluminescent applications.
Answer: It is utilized to create thin films with excellent luminescent properties, enabling applications in displays, safety signage, and photonic devices.
Answer: This material exhibits a bright green or yellow-green glow with a long afterglow duration, making it suitable for prolonged visibility in dark environments.
Answer: The luminescent properties can be fine-tuned during thin-film deposition processes by controlling parameters such as thickness and substrate material.
Introduction to Europium-Doped Strontium Aluminate
SrAl₂O₄ is a Eu²⁺-doped aluminate phosphor with a monoclinic P2₁ structure built from corner-sharing AlO₄ tetrahedra and two distinct Sr²⁺ sites. Eu²⁺ substitutes for Sr²⁺, producing characteristic broadband green-to-blue-green photoluminescence through 4f–5d transitions. The host is a wide-bandgap, electrically insulating oxide with strong thermal and chemical stability. RF magnetron sputtering from ceramic SrAl₂O₄ targets enables controlled stoichiometry and uniform, adherent thin films while helping maintain the Eu²⁺/Eu³⁺ balance critical to luminescence. These films are used in electroluminescent and photoluminescent devices, optical down-shifting layers, spectral-conversion coatings, luminescent sensors, and UV-readable security or identification markings.
Key Properties of Europium-Doped Strontium Aluminate
Property
Value
Significance
Chemical formula
SrAl2O4:Eu (Eu2+-activated strontium aluminate)
Identifies the host lattice and the luminescent activator species; distinguishes this material from the Eu, Dy co-doped long-persistence pigment grade
Crystal structure
Monoclinic, space group P21; stuffed-tridymite-derived AlO4 tetrahedral framework with two inequivalent Sr sites
The two distinct Sr sites give rise to the material’s characteristic dual-band (blue-green/green) emission behaviour
Molar mass
~205.58 g/mol (host lattice)
Used for stoichiometric process control and deposition-rate calculations during sputtering
Density
~3.56 g/cm3 theoretical; ~3.2-3.5 g/cm3 typical sintered target density
Higher relative density improves erosion uniformity and reduces particulate generation during sputtering
Melting point
~1600-1650 C
Sets the practical ceiling for target sintering temperature and informs thermal-shock tolerance under magnetron power loading
Electrically insulating character requires RF (not DC) magnetron sputtering for stable plasma operation
Photoluminescence (excitation/emission)
Excitation band approx. 250-400 nm (UV/near-UV); emission peak approx. 520 nm green, with a blue-green shoulder near 480-500 nm from the second Sr site
Defines the optical function of the deposited film and the UV source needed to read it out
Afterglow/persistence
Short-lived phosphorescence (seconds to a few minutes) without a co-dopant; multi-hour afterglow requires Dy3+ (or B3+) co-doping, which this Eu-only grade does not include
Critical buyer distinction: this target produces bright prompt photoluminescence, not the hours-long glow of commercial Eu, Dy “glow in the dark” pigment
Types & Grades of Europium-Doped Strontium Aluminate
Europium-Doped Strontium Aluminate targets are offered in standard catalogue sizes and grades, with custom purity, density, and geometry available for OEM and R&D deposition systems.
Grade / Form
Typical Purity
Key Features / Uses
Standard catalogue disc
99.9%
Dia. 1in x 0.125in and Dia. 2in x 0.25in ready-stock discs (IN-AlEuSr-01, IN-AlEuSr-02) for R&D and pilot-line deposition
High-purity research grade
99.99% – 99.999%
Reduced trace transition-metal and rare-earth contamination for photoluminescence quantum-yield and site-occupancy studies
Large-format / custom disc
99.9% – 99.99%
Diameters to 6 in and beyond, plus rectangular and planar plate geometries for pilot and production-scale coaters
Bonded assembly (In or conductive-epoxy backed)
99.9%+
Target diffusion- or epoxy-bonded to a Cu backing plate to compensate for the ceramic’s low thermal conductivity under sustained RF power
Rotary/cylindrical target
99.9%+
Custom lead-time item for high-throughput in-line and roll-to-roll coaters requiring extended target life
Applications of Europium-Doped Strontium Aluminate
Sputtered films of Europium-Doped Strontium Aluminate support demanding roles across research and production applications where this material’s specific structural, electronic, or optical properties are the key requirement.
Industry
Application
Function
Security printing & anti-counterfeiting
Covert and semi-covert luminescent taggants
Sputtered SrAl2O4:Eu films provide a UV-readable authentication mark that is difficult to replicate with bulk pigment inks.
Display & optoelectronics R&D
Electroluminescent and photoluminescent thin-film device stacks
Serves as the green-emitting phosphor layer in experimental EL and PL device architectures
Safety & emergency signage
Photoluminescent coatings on glass and polymer substrates
A sputtered film gives a thin, uniform, well-adhered glow-marking layer where bulk pigment coatings are impractical
Sensing & instrumentation
Optical temperature-sensitive and mechanoluminescent probe layers
Eu2+ emission intensity and decay characteristics respond to local thermal and stress conditions in thin-film form
Solar & photovoltaic research
UV-to-visible spectral down-shifting coatings
Converts high-energy UV photons to visible wavelengths better matched to cell spectral response
Academic & materials research
Model system for rare-earth-doped oxide phosphor thin films
Widely used to study Eu2+/Eu3+ site occupancy, defect trapping, and luminescence physics in controlled thin-film form
Why Partner with Infinita Materials?
Technical Depth: in-house quality control with ICP-MS and XRF purity verification, density measurement, and full certificates of analysis on every target.
Global Logistics: reliable supply from single R&D-scale targets to production-line volumes, with established international shipping.
Responsive Support: direct access to materials engineers for grade, bonding, and geometry selection, and process-compatibility questions.
Take the Next Step
Infinita Materials fabricates Europium-Doped Strontium Aluminate sputtering targets engineered to the purity, density, and geometry your deposition process requires. Whether the requirement is a standard catalogue target or a custom size, purity, or bonded assembly, our team can help match the right specification to your deposition system. Request a quote or speak with our technical team to discuss your target specification.
Other Related Product to Strontium Aluminate Doped with Europium, SrAl2O4 with 3 wt% Eu
A doping level of 3 wt% Europium balances brightness, afterglow duration, and material stability, making it ideal for a wide range of photoluminescent applications.
This material exhibits a bright green or yellow-green glow with a long afterglow duration, making it suitable for prolonged visibility in dark environments.
The luminescent properties can be fine-tuned during thin-film deposition processes by controlling parameters such as thickness and substrate material.
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