PRELIMINARY INVESTIGATIONS ON PREPARATION OF CA2GEO4 AND CA5GE3O11 GLASS-CERAMICS DOPED BY RARE EARTH IONS FOR LED APPLICATION (RE3+ = TB3+, EU3+ AND DY3+)
I. Koseva , V. Nikolov, , P. Tzvetkov, M. Gancheva, P. Ivanov, P. Petrova, R. Tomova
Pages: 151-161
Published: 23 Sep 2021
Views: 717
Downloads: 72
Abstract: 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.
Keywords: germanate phosphor, rare-earth doped glass-ceramics, photoluminescence
Cite this article: I. Koseva , V. Nikolov, , P. Tzvetkov, M. Gancheva, P. Ivanov, P. Petrova, R. Tomova. PRELIMINARY INVESTIGATIONS ON PREPARATION OF CA2GEO4 AND CA5GE3O11 GLASS-CERAMICS DOPED BY RARE EARTH IONS FOR LED APPLICATION (RE3+ = TB3+, EU3+ AND DY3+). Journal of International Scientific Publications: Materials, Methods & Technologies 15, 151-161 (2021). https://www.scientific-publications.net/en/article/1002207/
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