Comparative structural and photoluminescent study of Eu3+-doped La2O3 and La(OH)(3) nanocrystalline powders
Апстракт
Eu3+-doped La2O3 nanocrystalline powder was prepared by polymer complex solution method and further used for preparation of Eu3+-doped La(OH)(3). Structural and optical characterization was carried out by powder X-ray diffraction and photoluminescent spectroscopy. XRD measurements confirmed the formation of hexagonal La2O3 and its recrystallization into La(OH)3 in a humid atmosphere. Excitation spectra show redshift of host lattice and charge transfer emission bands in La(OH)3 while bands that correspond to Eu3+- f-f transitions are placed at same wavelengths in both samples. Photoluminescence spectra recorded over the temperature range from 10 K to 300 K show that intensities of emission lines in Eu3+-doped La2O3 do not depend on temperature as much as in La(OH)3 sample. Observed dominant D-5(0) - GT :F-7(2) and markedly visible D-5(0)- GT F-7(0) emissions in doped La2O3 indicate that Eu3+ ion is located in a structural site without an inversion center. On the other hand, in Eu3+-dope...d La(OH)3 D-5(0)- GT F-7(0) transition is barely visible while D-5(0)- GT F-7(2) is not prominent, and with temperature drop three D-5(0)- GT F-7(j) (J=1, 2, 4) transitions become almost of the same intensity. In both La2O3 and La(OH)3 structures Eu3 ion replaces La3+ in non-centrosymmetric C-3v and C-3h crystallographic sites, respectively, and difference in symmetry of the crystal field around europium ion is explained by comparing shape and volume of these sites. Decay times of the 5D0- level recorded over the temperature range 10-300 K revealed that emission lifetime values in La2O3 (-0.7 ms) are almost two times higher than in La(OH)3 (-0.4 ms), and unlike in La2O3, lifetime in La(OH)(3) is temperature dependent. (C) 2013 Elsevier Ltd. All rights reserved.
Кључне речи:
Nanostructures / Optical materials / Luminescence / Crystal fieldsИзвор:
Journal of Physics and Chemistry of Solids, 2014, 75, 2, 276-282Финансирање / пројекти:
- Материјали редуковане димензионалности за ефикасну апсорпцију светлости и конверзију енергије (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45020)
- Физика аморфних и наноструктурних материјала (RS-MESTD-Basic Research (BR or ON)-171022)
DOI: 10.1016/j.jpcs.2013.10.004
ISSN: 0022-3697; 1879-2553
WoS: 000329270800018
Scopus: 2-s2.0-84888321367
Колекције
Институција/група
VinčaTY - JOUR AU - Đorđević, Vesna R. AU - Antić, Željka AU - Nikolić, Marko G. AU - Dramićanin, Miroslav PY - 2014 UR - https://vinar.vin.bg.ac.rs/handle/123456789/5831 AB - Eu3+-doped La2O3 nanocrystalline powder was prepared by polymer complex solution method and further used for preparation of Eu3+-doped La(OH)(3). Structural and optical characterization was carried out by powder X-ray diffraction and photoluminescent spectroscopy. XRD measurements confirmed the formation of hexagonal La2O3 and its recrystallization into La(OH)3 in a humid atmosphere. Excitation spectra show redshift of host lattice and charge transfer emission bands in La(OH)3 while bands that correspond to Eu3+- f-f transitions are placed at same wavelengths in both samples. Photoluminescence spectra recorded over the temperature range from 10 K to 300 K show that intensities of emission lines in Eu3+-doped La2O3 do not depend on temperature as much as in La(OH)3 sample. Observed dominant D-5(0) - GT :F-7(2) and markedly visible D-5(0)- GT F-7(0) emissions in doped La2O3 indicate that Eu3+ ion is located in a structural site without an inversion center. On the other hand, in Eu3+-doped La(OH)3 D-5(0)- GT F-7(0) transition is barely visible while D-5(0)- GT F-7(2) is not prominent, and with temperature drop three D-5(0)- GT F-7(j) (J=1, 2, 4) transitions become almost of the same intensity. In both La2O3 and La(OH)3 structures Eu3 ion replaces La3+ in non-centrosymmetric C-3v and C-3h crystallographic sites, respectively, and difference in symmetry of the crystal field around europium ion is explained by comparing shape and volume of these sites. Decay times of the 5D0- level recorded over the temperature range 10-300 K revealed that emission lifetime values in La2O3 (-0.7 ms) are almost two times higher than in La(OH)3 (-0.4 ms), and unlike in La2O3, lifetime in La(OH)(3) is temperature dependent. (C) 2013 Elsevier Ltd. All rights reserved. T2 - Journal of Physics and Chemistry of Solids T1 - Comparative structural and photoluminescent study of Eu3+-doped La2O3 and La(OH)(3) nanocrystalline powders VL - 75 IS - 2 SP - 276 EP - 282 DO - 10.1016/j.jpcs.2013.10.004 ER -
@article{ author = "Đorđević, Vesna R. and Antić, Željka and Nikolić, Marko G. and Dramićanin, Miroslav", year = "2014", abstract = "Eu3+-doped La2O3 nanocrystalline powder was prepared by polymer complex solution method and further used for preparation of Eu3+-doped La(OH)(3). Structural and optical characterization was carried out by powder X-ray diffraction and photoluminescent spectroscopy. XRD measurements confirmed the formation of hexagonal La2O3 and its recrystallization into La(OH)3 in a humid atmosphere. Excitation spectra show redshift of host lattice and charge transfer emission bands in La(OH)3 while bands that correspond to Eu3+- f-f transitions are placed at same wavelengths in both samples. Photoluminescence spectra recorded over the temperature range from 10 K to 300 K show that intensities of emission lines in Eu3+-doped La2O3 do not depend on temperature as much as in La(OH)3 sample. Observed dominant D-5(0) - GT :F-7(2) and markedly visible D-5(0)- GT F-7(0) emissions in doped La2O3 indicate that Eu3+ ion is located in a structural site without an inversion center. On the other hand, in Eu3+-doped La(OH)3 D-5(0)- GT F-7(0) transition is barely visible while D-5(0)- GT F-7(2) is not prominent, and with temperature drop three D-5(0)- GT F-7(j) (J=1, 2, 4) transitions become almost of the same intensity. In both La2O3 and La(OH)3 structures Eu3 ion replaces La3+ in non-centrosymmetric C-3v and C-3h crystallographic sites, respectively, and difference in symmetry of the crystal field around europium ion is explained by comparing shape and volume of these sites. Decay times of the 5D0- level recorded over the temperature range 10-300 K revealed that emission lifetime values in La2O3 (-0.7 ms) are almost two times higher than in La(OH)3 (-0.4 ms), and unlike in La2O3, lifetime in La(OH)(3) is temperature dependent. (C) 2013 Elsevier Ltd. All rights reserved.", journal = "Journal of Physics and Chemistry of Solids", title = "Comparative structural and photoluminescent study of Eu3+-doped La2O3 and La(OH)(3) nanocrystalline powders", volume = "75", number = "2", pages = "276-282", doi = "10.1016/j.jpcs.2013.10.004" }
Đorđević, V. R., Antić, Ž., Nikolić, M. G.,& Dramićanin, M.. (2014). Comparative structural and photoluminescent study of Eu3+-doped La2O3 and La(OH)(3) nanocrystalline powders. in Journal of Physics and Chemistry of Solids, 75(2), 276-282. https://doi.org/10.1016/j.jpcs.2013.10.004
Đorđević VR, Antić Ž, Nikolić MG, Dramićanin M. Comparative structural and photoluminescent study of Eu3+-doped La2O3 and La(OH)(3) nanocrystalline powders. in Journal of Physics and Chemistry of Solids. 2014;75(2):276-282. doi:10.1016/j.jpcs.2013.10.004 .
Đorđević, Vesna R., Antić, Željka, Nikolić, Marko G., Dramićanin, Miroslav, "Comparative structural and photoluminescent study of Eu3+-doped La2O3 and La(OH)(3) nanocrystalline powders" in Journal of Physics and Chemistry of Solids, 75, no. 2 (2014):276-282, https://doi.org/10.1016/j.jpcs.2013.10.004 . .