Monodispersed Ce(iv)-Gd(iii)-Eu(iii) oxide phosphors for enhanced red emission under visible excitation
A family of Ce0.95-xGdxEu0.05(OH)CO 3·H2O monodispersed spherical particles of ca. 200 nm with 0 ≤ x ≤ 0.95 was obtained by the urea homogeneous alkalinization method. These precursors were decomposed at 1273 K under an air atmosphere, resulting in ternary spheroidal phosphors obeying the general fo...
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2014
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paper:paper_20507534_v2_n6_p1010_Sorbello2023-06-08T16:33:55Z Monodispersed Ce(iv)-Gd(iii)-Eu(iii) oxide phosphors for enhanced red emission under visible excitation Barja, Beatriz Carmen Jobbagy, Matias Direct excitation General formulas Homogeneous alkalinization Ligand-to-metal charge transfers Oxide phosphors Partial substitution Spherical particle Structure-related Phosphors Urea Light emission A family of Ce0.95-xGdxEu0.05(OH)CO 3·H2O monodispersed spherical particles of ca. 200 nm with 0 ≤ x ≤ 0.95 was obtained by the urea homogeneous alkalinization method. These precursors were decomposed at 1273 K under an air atmosphere, resulting in ternary spheroidal phosphors obeying the general formula Ce 0.95-xGdxEu0.05O1.975-x/2. Samples with 0.57 ≤ x ≤ 0.95 exhibit a c-type (Ia3) structure related to the Gd2O3 lattice, while a Fm3m-type (CeO2) one was found for 0 ≤ x ≤ 0.19. For both ternary families, the partial substitution of host cations dramatically decreases the efficiency of the ligand to metal charge transfer (LMCT) based emission, with respect to their binary end members. In contrast, the emission obtained from direct excitation of Eu(iii) with visible light is enhanced. For both structures, the binary Ce(iv)-Gd(iii) host improved emission with respect to Gd0.95Eu0.05O1.5 and Ce0.95Eu 0.05O1.975 samples, achieving an optimum value for the sample Ce0.23Gd0.71Eu0.05O1.6 with a Ia3 structure. © 2013 The Royal Society of Chemistry. Fil:Barja, B.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Jobbágy, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20507534_v2_n6_p1010_Sorbello http://hdl.handle.net/20.500.12110/paper_20507534_v2_n6_p1010_Sorbello |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Direct excitation General formulas Homogeneous alkalinization Ligand-to-metal charge transfers Oxide phosphors Partial substitution Spherical particle Structure-related Phosphors Urea Light emission |
| spellingShingle |
Direct excitation General formulas Homogeneous alkalinization Ligand-to-metal charge transfers Oxide phosphors Partial substitution Spherical particle Structure-related Phosphors Urea Light emission Barja, Beatriz Carmen Jobbagy, Matias Monodispersed Ce(iv)-Gd(iii)-Eu(iii) oxide phosphors for enhanced red emission under visible excitation |
| topic_facet |
Direct excitation General formulas Homogeneous alkalinization Ligand-to-metal charge transfers Oxide phosphors Partial substitution Spherical particle Structure-related Phosphors Urea Light emission |
| description |
A family of Ce0.95-xGdxEu0.05(OH)CO 3·H2O monodispersed spherical particles of ca. 200 nm with 0 ≤ x ≤ 0.95 was obtained by the urea homogeneous alkalinization method. These precursors were decomposed at 1273 K under an air atmosphere, resulting in ternary spheroidal phosphors obeying the general formula Ce 0.95-xGdxEu0.05O1.975-x/2. Samples with 0.57 ≤ x ≤ 0.95 exhibit a c-type (Ia3) structure related to the Gd2O3 lattice, while a Fm3m-type (CeO2) one was found for 0 ≤ x ≤ 0.19. For both ternary families, the partial substitution of host cations dramatically decreases the efficiency of the ligand to metal charge transfer (LMCT) based emission, with respect to their binary end members. In contrast, the emission obtained from direct excitation of Eu(iii) with visible light is enhanced. For both structures, the binary Ce(iv)-Gd(iii) host improved emission with respect to Gd0.95Eu0.05O1.5 and Ce0.95Eu 0.05O1.975 samples, achieving an optimum value for the sample Ce0.23Gd0.71Eu0.05O1.6 with a Ia3 structure. © 2013 The Royal Society of Chemistry. |
| author |
Barja, Beatriz Carmen Jobbagy, Matias |
| author_facet |
Barja, Beatriz Carmen Jobbagy, Matias |
| author_sort |
Barja, Beatriz Carmen |
| title |
Monodispersed Ce(iv)-Gd(iii)-Eu(iii) oxide phosphors for enhanced red emission under visible excitation |
| title_short |
Monodispersed Ce(iv)-Gd(iii)-Eu(iii) oxide phosphors for enhanced red emission under visible excitation |
| title_full |
Monodispersed Ce(iv)-Gd(iii)-Eu(iii) oxide phosphors for enhanced red emission under visible excitation |
| title_fullStr |
Monodispersed Ce(iv)-Gd(iii)-Eu(iii) oxide phosphors for enhanced red emission under visible excitation |
| title_full_unstemmed |
Monodispersed Ce(iv)-Gd(iii)-Eu(iii) oxide phosphors for enhanced red emission under visible excitation |
| title_sort |
monodispersed ce(iv)-gd(iii)-eu(iii) oxide phosphors for enhanced red emission under visible excitation |
| publishDate |
2014 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20507534_v2_n6_p1010_Sorbello http://hdl.handle.net/20.500.12110/paper_20507534_v2_n6_p1010_Sorbello |
| work_keys_str_mv |
AT barjabeatrizcarmen monodispersedceivgdiiieuiiioxidephosphorsforenhancedredemissionundervisibleexcitation AT jobbagymatias monodispersedceivgdiiieuiiioxidephosphorsforenhancedredemissionundervisibleexcitation |
| _version_ |
1768543252531642368 |