Blue photo luminescence from 3 mol%Y2O3-doped ZrO2 polycrystals sintered by flash sintering under an alternating current electric field
| Autor: | Takahisa Yamamoto, Tsuyoshi Kurachi, Hidehiro Yoshida, Yudai Yamashita, Tomoharu Tokunaga |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Photoluminescence Materials science Annealing (metallurgy) Doping Analytical chemistry Sintering 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Electric field 0103 physical sciences Materials Chemistry Ceramics and Composites Ultraviolet light 0210 nano-technology Luminescence Excitation |
| Zdroj: | Journal of the European Ceramic Society. 40:2072-2076 |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2019.12.060 |
| Popis: | We investigated the photoluminescence (PL) properties of 3 mol%Y2O3-ZrO2 (3YSZ) polycrystals. The 3YSZ polycrystals were prepared by an isothermal flash sintering technique in which an alternating electric field was applied at a predetermined furnace temperature. After flash sintering, clear, visibly blue PL at 2.82 eV (440 nm) was confirmed under an ultraviolet light (3.4 eV (365 nm)); however, no visible PL was observed from 3YSZ polycrystals conventionally sintered using the same raw powders. Thus, the emission of blue PL was induced by the electric field applied during sintering. The obtained PL band was related to excitation at 3.87 eV (320 nm), which is possibly assigned to the singly ionized associated oxygen vacancy defects (AOD + centers). Furthermore, the blue emission was stable after high temperature annealing at 1400 °C for 1 h in air. We possibly attribute the emission of this PL to the stabilization of AOD + centers by the electric field loading during flash sintering. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect