Sol-Gel Derived Eu3+-Doped Gd2Ti2O7 Pyrochlore Nanopowders
Апстракт
Herein we presented hydrolytic sol-gel synthesis and photoluminescent properties of Eu3+-doped Gd2Ti2O7 pyrochlore nanopowders. According to Gd2Ti2O7 precursor gel thermal analysis a temperature of 840 degrees C is identified for the formation of the crystalline pyrochlore phase. Obtained samples were systematically characterized by powder X-ray diffraction, scanning and transmission electron microscopy, and photoluminescence spectroscopy. The powders consist of well-crystalline cubic nanocrystallites of approximately 20 nm in size as evidenced from X-ray diffraction. The scanning and transmission electron microscopy shows that investigated Eu3+-doped Gd2Ti2O7 nanopowders consist of compact, dense aggregates composed entirely of nanoparticles with variable both shape and dimension. The influence of Eu3+ ions concentration on the optical properties, namely, photoluminescence emission and decay time, is measured and discussed. Emission intensity as a function of Eu3+ ions concentration s...hows that Gd2Ti2O7 host can accept Eu3+ ions in concentrations up to 10 at.%. On the other hand, lifetime values are similar up to 3 at.%(similar to 2.7ms) and experience decrease at higher concentrations (2.4ms for 10 at.% Eu3+). Moreover, photoluminescent spectra and lifetime values clearly revealed presence of structural defects in sol-gel derived materials proposing photoluminescent spectroscopy as a sensitive tool for monitoring structural changes in both steady state and lifetime domains.
Извор:
Journal of Nanomaterials, 2015Финансирање / пројекти:
- Материјали редуковане димензионалности за ефикасну апсорпцију светлости и конверзију енергије (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45020)
- Утицај величине, облика и структуре наночестица на њихова својства и својства нанокомпозита (RS-MESTD-Basic Research (BR or ON)-172056)
DOI: 10.1155/2015/514173
ISSN: 1687-4110; 1687-4129
WoS: 000351410400001
Scopus: 2-s2.0-84925326265
Колекције
Институција/група
VinčaTY - JOUR AU - Ćulubrk, Sanja AU - Antić, Željka AU - Lojpur, Vesna AU - Marinović-Cincović, Milena AU - Dramićanin, Miroslav PY - 2015 UR - https://vinar.vin.bg.ac.rs/handle/123456789/460 AB - Herein we presented hydrolytic sol-gel synthesis and photoluminescent properties of Eu3+-doped Gd2Ti2O7 pyrochlore nanopowders. According to Gd2Ti2O7 precursor gel thermal analysis a temperature of 840 degrees C is identified for the formation of the crystalline pyrochlore phase. Obtained samples were systematically characterized by powder X-ray diffraction, scanning and transmission electron microscopy, and photoluminescence spectroscopy. The powders consist of well-crystalline cubic nanocrystallites of approximately 20 nm in size as evidenced from X-ray diffraction. The scanning and transmission electron microscopy shows that investigated Eu3+-doped Gd2Ti2O7 nanopowders consist of compact, dense aggregates composed entirely of nanoparticles with variable both shape and dimension. The influence of Eu3+ ions concentration on the optical properties, namely, photoluminescence emission and decay time, is measured and discussed. Emission intensity as a function of Eu3+ ions concentration shows that Gd2Ti2O7 host can accept Eu3+ ions in concentrations up to 10 at.%. On the other hand, lifetime values are similar up to 3 at.%(similar to 2.7ms) and experience decrease at higher concentrations (2.4ms for 10 at.% Eu3+). Moreover, photoluminescent spectra and lifetime values clearly revealed presence of structural defects in sol-gel derived materials proposing photoluminescent spectroscopy as a sensitive tool for monitoring structural changes in both steady state and lifetime domains. T2 - Journal of Nanomaterials T1 - Sol-Gel Derived Eu3+-Doped Gd2Ti2O7 Pyrochlore Nanopowders DO - 10.1155/2015/514173 ER -
@article{ author = "Ćulubrk, Sanja and Antić, Željka and Lojpur, Vesna and Marinović-Cincović, Milena and Dramićanin, Miroslav", year = "2015", abstract = "Herein we presented hydrolytic sol-gel synthesis and photoluminescent properties of Eu3+-doped Gd2Ti2O7 pyrochlore nanopowders. According to Gd2Ti2O7 precursor gel thermal analysis a temperature of 840 degrees C is identified for the formation of the crystalline pyrochlore phase. Obtained samples were systematically characterized by powder X-ray diffraction, scanning and transmission electron microscopy, and photoluminescence spectroscopy. The powders consist of well-crystalline cubic nanocrystallites of approximately 20 nm in size as evidenced from X-ray diffraction. The scanning and transmission electron microscopy shows that investigated Eu3+-doped Gd2Ti2O7 nanopowders consist of compact, dense aggregates composed entirely of nanoparticles with variable both shape and dimension. The influence of Eu3+ ions concentration on the optical properties, namely, photoluminescence emission and decay time, is measured and discussed. Emission intensity as a function of Eu3+ ions concentration shows that Gd2Ti2O7 host can accept Eu3+ ions in concentrations up to 10 at.%. On the other hand, lifetime values are similar up to 3 at.%(similar to 2.7ms) and experience decrease at higher concentrations (2.4ms for 10 at.% Eu3+). Moreover, photoluminescent spectra and lifetime values clearly revealed presence of structural defects in sol-gel derived materials proposing photoluminescent spectroscopy as a sensitive tool for monitoring structural changes in both steady state and lifetime domains.", journal = "Journal of Nanomaterials", title = "Sol-Gel Derived Eu3+-Doped Gd2Ti2O7 Pyrochlore Nanopowders", doi = "10.1155/2015/514173" }
Ćulubrk, S., Antić, Ž., Lojpur, V., Marinović-Cincović, M.,& Dramićanin, M.. (2015). Sol-Gel Derived Eu3+-Doped Gd2Ti2O7 Pyrochlore Nanopowders. in Journal of Nanomaterials. https://doi.org/10.1155/2015/514173
Ćulubrk S, Antić Ž, Lojpur V, Marinović-Cincović M, Dramićanin M. Sol-Gel Derived Eu3+-Doped Gd2Ti2O7 Pyrochlore Nanopowders. in Journal of Nanomaterials. 2015;. doi:10.1155/2015/514173 .
Ćulubrk, Sanja, Antić, Željka, Lojpur, Vesna, Marinović-Cincović, Milena, Dramićanin, Miroslav, "Sol-Gel Derived Eu3+-Doped Gd2Ti2O7 Pyrochlore Nanopowders" in Journal of Nanomaterials (2015), https://doi.org/10.1155/2015/514173 . .