| Autor: |
Koseva, I., Nikolov, V., Tzvetkov, P., Gancheva, M., Ivanov, P., Petrova, P., Tomova, R. |
| Rok vydání: |
2021 |
| Předmět: |
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| Popis: |
Glasses with two different compositions doped by Tb3+, Eu3+, or Dy3+ ions were prepared from the oxide system CaO-GeO2-Li2O-B2O3. After thermal treatment Ca2GeO4 or Ca5Ge3O11 crystalize as a main phase. Thermal treatment conditions were determined from the DTA curves of the initial glasses. Excitation and emission spectra of the doped glass-ceramics contain the characteristic transitions of Eu3+, Tb3+ , and Dy3+ ions. Some differences appear depending on the crystallizing phases. CIE coordinates of Eu3+ doped samples are placed in a very narrow area in the red part of the chromaticity diagram. CIE coordinates of the Tb3+ ion are more widely located in the green region. CIE coordinates of the Dy3+ ion are in a narrow area in the yellow chromaticity part. The studied glass-ceramics could be used as red, green, and yellow phosphors. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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