Luminescent Dy3+ and Dy3+/Cr3+ doped transparent Al2O3 ceramics: Microstructure and optical properties/p

0557818 - ÚFM 2023 RIV GB eng J - Journal Article
Drdlíková, K. - Klement, R. - Svoboda, Jiří - Drdlík, D. - Galusek, D. - Maca, K.
Luminescent Dy3+ and Dy3+/Cr3+ doped transparent Al2O3 ceramics: Microstructure and optical properties/p.
Journal of the European Ceramic Society. Roč. 42, č. 10 (2022), s. 4343-4352. ISSN 0955-2219. E-ISSN 1873-619X
R&D Projects: GA ČR(CZ) GA20-14237S
Research Infrastructure: CzechNanoLab - 90110
Institutional support: RVO:68081723
Keywords : alumina ceramics * photoluminescence properties * temperature * oxide * Alumina * Dysprosium * Chromium * Co-doping * Microstructure
OECD category: Thermodynamics
Impact factor: 5.7, year: 2022
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0955221922002266?via%3Dihub

Highly transparent Dy3+ and Dy3+/Cr3+ polycrystalline alumina ceramics were prepared with the real in-line transmittance (RIT) up to 55% (at lambda = 632 nm), one of the highest values reported for luminescent rare-earth elements doped alumina. The RIT of doped alumina decreased more sharply with increasing mean grain size than predicted by the models for pure alumina. Co-doping with Dy3+ and Cr3+ resulted in a moderate increase of the RIT, which was independent on grain size. EDX analysis revealed that dysprosium segregated at grain boundaries and chromium was dispersed throughout the alumina matrix. A thermodynamic model for diffusion of multiple species in systems with multiple sorts of traps was proposed. The photoluminescence excitation and emission spectra of Dy3+-doped alumina showed peaks characteristic for Dy3+-doped materials. In co-doped Dy3+/Cr3+ alumina, Dy3+ emitted in the blue and yellow regions and Cr3+ in the red region, creating a suitable combination for obtaining white light.
Permanent Link: http://hdl.handle.net/11104/0331707