Monodispersed Ce( iv )–Gd( iii )–Eu( iii ) oxide phosphors for enhanced red emission under visible excitation

A family of Ce sub(0.95-x)Gd sub(x)Eu sub(0.05)(OH)CO sub(3).H sub(2)O monodispersed spherical particles of ca. 200 nm with 0 less than or equal to x less than or equal to 0.95 was obtained by the urea homogeneous alkalinization method. These precursors were decomposed at 1273 K under an air atmosph...

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Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2014-01, Vol.2 (6), p.1010-1017
Main Authors: Sorbello, C., Barja, B. C., Jobbágy, M.
Format: Article
Language:English
Subjects:
Computational efficiency
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Summary:A family of Ce sub(0.95-x)Gd sub(x)Eu sub(0.05)(OH)CO sub(3).H sub(2)O monodispersed spherical particles of ca. 200 nm with 0 less than or equal to x less than or equal to 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 sub(0.95-x)Gd sub(x)Eu sub(0.05)O sub(1.975-x/2). Samples with 0.57 less than or equal to x less than or equal to 0.95 exhibit a c-type (Ia3) structure related to the Gd sub(2)O sub(3) lattice, while a F sub(m)3 sub(m)-type (CeO sub(2)) one was found for 0 less than or equal to x less than or equal to 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 Gd sub(0.95)Eu sub(0.05)O sub(1.5) and Ce sub(0.95)Eu sub(0.05)O sub(1.975) samples, achieving an optimum value for the sample Ce sub(0.23)Gd sub(0.71)Eu sub(0.05)O sub(1.6) with a Ia3 structure.
ISSN:2050-7526
2050-7534
DOI:10.1039/C3TC31952K