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Meeting MS&T23: Materials Science & Technology
Symposium Solid-state Optical Materials and Luminescence Properties
Presentation Title Ultraviolet Excitation of Trivalent Europium in Alumina
Author(s) John Kenneth Krebs, Alex Sobey-Strick
On-Site Speaker (Planned) John Kenneth Krebs
Abstract Scope The luminescent properties of lanthanide impurity ions in metal oxide hosts make good candidates for device phosphors. The optical transitions between 4f electronic levels in the lanthanides enable color selection but suffer from low quantum transition probabilities, which limit their efficiency. However, other physical mechanisms for exciting the lanthanides can enhance their excitation efficiency. In this work, we study the UV excitation of europium impurities in the aluminum oxide host. Combustion synthesis reactions result in doped alumina samples of definite crystal structure with particle sizes around 30 nm. Optical spectroscopic techniques verify the f-f energy level transitions identified as impurities occupying the aluminum cation sites. Ultraviolet excitation (266 nm) leads to broader emission peaks than resonant (visible) excitation. Ultraviolet excitation measurements allow the distinction between charge transfer excitation of the main site and that of a poorly ordered phase, likely associated with impurities at grain boundaries.


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Photoluminescent Behaviors of Mixed Metal Thiophosphates XScP2S6 (X=Ag, Cu) Above and Below Bandgap
Processing and Optical Properties of Noncubic RE-doped Ga2O3 Transparent Ceramics
Study of Garnet Scintillating Single Crystal Fiber Grown by Laser Heated Pedestal Growth Method
Study of Surface Effects in Yb3+ Doped Garnet Nanopowders for Understanding Grain Boundary Processes in Laser Ceramics: Fabrication and Spectroscopic Properties
Surface Morphology and Fracturing of Femtosecond Laser-irradiated Calcium Fluoride
Ultrafast Laser-induced Damage and Non-linear Optical Properties of Metal Thiophosphates
Ultraviolet Excitation of Trivalent Europium in Alumina

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