Photoluminescence Properties of Lanthanide-Doped Alumina and YAG Aerogels
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
In this work, the range of alumina (Al 2O 3) and yttrium aluminum garnet (YAG) aerogels was extended by doping them with lanthanide ions. The aerogels were synthesized by using a universal, epoxide-assisted sol-gel method. They were thermally treated to induce structural changes, which were characterized in more detail by using X-ray diffraction and electron microscopy. The alumina samples showed topotactic phase transformations from boehmite, via γ-alumina to a mixed alumina phase, while the YAG started as an amorphous mixed oxide phase, which crystallized at 1000 °C into pure crystalline YAG. In order to expand the functionalities of the aerogels, they were doped with the rare-earth ions Eu 3+ and Tb 3+ (3 mol %). The red or green photoluminescence could be observed only starting from a temperature treatment of 550 °C, which can be related to the defect reduction and crystallinity increase due to phase transformations and sintering processes occurring. For the first time, the photoluminescence quantum yields of luminescent aerogels could be determined. The highest quantum yield of 25.5 ± 1.1% was achieved for the Al 2O 3-Tb-1000 sample.
Details
Original language | English |
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Pages (from-to) | 16995-17001 |
Number of pages | 7 |
Journal | Journal of Physical Chemistry C, Nanomaterials and interfaces |
Volume | 127 |
Issue number | 34 |
Early online date | Aug 2023 |
Publication status | Published - 21 Aug 2023 |
Peer-reviewed | Yes |
External IDs
Scopus | 85170264250 |
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Keywords
Keywords
- Thermal-stability, Yttrium-oxide, Transition, Luminescence, Nanocrystalline, Intensity, Monoliths, Chemistry, Ions