Journal of Materials NanoScience
J. Mat. NanoSci., 2019, 6 (2), 73‐81 73
J. Mat. NanoSci. 2019, 6(2), 73‐81 Article .
Journal of
Materials NanoScience
Novel synthesis and Optical investigation of trivalent Europium doped
MGd
2
Si
3
O
10
(M = Mg
2+
, Ca
2+
, Sr
2+
and Ba
2+
) nanophosphors for full-color
displays
Suman Sheoran,
1
Sitender Singh,
1
Ajay Mann,
2
Anura Samantilleke,
3
Bernabe Mari,
4
Devender
Singh
1*
1
Department of Chemistry, Maharshi Dayanand University, Rohtak 124001, India
2
Pt. NRS Government College, Rohtak- 124001,
India.
3
Centro de Fisica, Universidade of Minho, Braga 4710057, Portugal.
4
Department de Fisica Aplicada, Universitat
Politecnica de Valencia, Valencia 46022, Spain
Submitted on: 20-Aug-2019, Accepted on: 01-Oct-2019 Published on: 07-Oct-2019
ABSTRACT
A series of Eu
3+
doped MGd
2
Si
3
O
10
(M = Mg
2+
, Ca
2+
, Sr
2+
and Ba
2+
) was synthesized via sol‐gel procedure at 950
o
C. The optical characteristics of
the materials were studied by Photoluminescence (PL) emission spectra. Upon 395 nm excitation and at 0.03 mole concentration of Eu
3+
ion,
these nanophosphors display optimum photoluminescence with most intense peak due to
5
D
0
→
7
F
2
(614‐616) of dopant. Powder X‐ray
diffraction (PXRD) analysis proves that all synthesized materials are of crystalline nature and crystallinity improves on increasing temperature.
Transmission electron microscopy (TEM) exhibited the spherical shape of particles in 13‐30 nm size. Fourier Transformation infrared (FTIR)
spectra showed peaks in 400‐1000 cm
‐1
corresponding to gadolinium‐oxygen and silicon‐oxygen bond vibrations. In BaGd
2
Si
3
O
10
material, Gd‐O
vibration is centered at 492 cm
‐1
and absorption band at 855 cm
‐1
is result of asymmetric vibrations of SiO in silicate tetrahedral unit. Due to
excellent photoluminescence and suitable CIE coordinates, these materials could have brilliant applications in innovative displays.
Keywords: MGd2Si3O10, nanophosphors, displays, lanthanide, luminescence, composites, LED
INTRODUCTION
The rare-earth ions doped phosphor materials have
considerably been evaluated for their uses in the advanced display
and lighting technology. The phosphors have countless uses in
white light emitting devices (WLEDs), cathode ray tubes, lasers,
optical communications, vacuum fluorescent display, biological
labeling, optoelectronic devices, X-ray imaging, etc.
1-4
The
application of phosphors in the light industry have been
manifested due to their characteristic properties like high
brightness, lower energy consumption, consistency, low
ecological impact, long lifetime and high current density.
5
The
phosphor materials comprise of appropriate host matrix and rare
earth ions as a dopant. Upon excitation, host lattice captivates the
energy and transfers to activator ion. Such transferred energy is
responsible for the excitation of electrons from ground energy
level to higher energy levels.
6-7
The excited states of these ions
1
2
3
4
0
0
1
2
3
395 nm excitation
613 nm
5D0-3
7F0-4
Europium(III)
589 nm
650-652 nm
*Corresponding Author: Dr. Devender Singh
Department of Chemistry, Maharshi Dayanand University, Rohtak
124001, Haryana, India
Tel: +91-9896001262
Email: devjakhar@gmail.com
Cite as: J. Mat. NanoSci., 2019, 6(2), 73-81.
urn:nbn:sciencein.jmns.2019v6.109
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