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Volume 6
Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212
Advanced Materials 2018
September 04-06, 2018
September 04-06, 2018 | Zürich, Switzerland
21
st
International Conference on
Advanced Materials & Nanotechnology
Comparative photoluminescence study of GdBO
3
: Eu phosphor in bulk and nano phase for its
implication in solid state lightening
Ramya Nair, Sandeep Nigam
and
V Sudarsan
Bhabha Atomic Research Centre, India
R
are-earth borates are excellent candidates for solid state lightening application due to its robust nature and brilliant optical
properties. GdBO
3
: Eu
3+
is one of the finest phosphors existing amongst borate phosphors for primary red color. In this
work we investigate the nature of structure-composition-optical relationships in both nano and bulk forms of GdBO
3
:Eu
3+
.
Nanophosphors have unique physical and chemical properties as compared to their bulk counterpart and so their emission
efficiencies vary which can finely be tuned and considerably improved. GdBO
3
exists in both monoclinic and triclinic phase.
GdBO
3
containing 1 at.% Eu
3+
were prepared in nano-crystalline, monoclinic and triclinic forms by hydrothermal and polyol
route. Techniques like XRD, FTIR, TEM, luminescence and lifetime measurements were used to characterize the samples.
SAED pattern illustrate phase formation while presence of nano rods with 200 nm length and width less than 10 nm are
confirmed from TEM images. Boron was found in both trigonal and tetrahedral coordination in nanorods and triclinic phase,
whereas only BO
4
structural unit exists in monoclinic GdBO
3
. Based on bond angle and bond length values obtained from
Rietveld refinement of the XRD patterns it is inferred that local environment around Eu
3+
in the triclinic form is more distorted
compared to monoclinic form. This explains increase in the relative intensity of electric dipole allowed transition of Eu
3+
in
triclinic form compared to monoclinic form. Red to orange ratio of Eu
3+
in triclinic and nanorods is found to be higher than
the monoclinic phase. From the results it is inferred that the nanorods have improved red color characteristics compared to
the other two forms. By size tuning we improvised optical parameters of the phosphor to develop materials with optimum
luminescence characteristics.
ramyagnair7@gmail.comRes. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C3-021