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Unraveling the Photoluminescence Properties of the Sr10V6O25 Structure through Experimental and Theoretical Analyses
journal contribution
posted on 2020-06-30, 11:38 authored by Mayara Mondego Teixeira, Amanda Fernandes Gouveia, Alexsandro Gama de Sousa, Luís Fernando da Silva, Regiane Cristina de Oliveira, Miguel A. San-Miguel, Máximo Siu Li, Elson LongoWhite
light photoluminescent materials can overcome many problems
due to an intrinsic color balance, in addition to reducing the cost
for application in emitting components and electronic devices. In
this sense, to observe this phenomenon of photoluminescence, variations
in the synthesis time at low temperatures were carried out, which
also influenced the degree of structural order/disorder of strontium
vanadate (Sr10V6O25, SVO). The microwave-assisted
hydrothermal route allowed us to evaluate the structural and morphological
evolution of the SVO compound. Furthermore, this paper discusses how
van der Waals forces influence the morphological evolution of a semiconductor
as a function of orientation, induction, and dispersion interactions.
The experimental study combined with theoretical approaches provided
information about the structure and electronic properties of SVO.
From the experimental data and theoretical analysis, we propose, for
the first time, that the unit cell of the SVO structure is composed
of three distorted [SrOx] (x = 6, 7, and 9) and two distorted [VO4] clusters. Photoluminescence
measurements revealed an efficient broadband emission, and the conversion
of ultraviolet light excitation into visible light was observed. The
emission chromaticity showed that the structural disorders of the
[SrOx] and [VO4] clusters present
the possibility of change in the Commission Internationale de l’Éclairage
emission color.