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Volume 3, Issue 4 (Suppl)
Nano Res Appl
ISSN: 2471-9838
November 07-08, 2017 Singapore
International Meeting on
Advanced Nanomaterials and Nanotechnology
Nanomaterials Meetings 2017
November 07-08, 2017
Page 32
Luminescence in nanosized vanadate phosphor
R
ecently, rare earth doped vanadate phosphors have paid considerable attention owing
to their long-wavelength excitation properties, which enable their use in LEDs,
fluorescent lamps and flat panel displays. The luminescence performance of a material
can be enhanced significantly by the suitable selection of host material. Since the white
light-emitting diodes (WLEDs) gaining much more attention. Generation of the white
light by combining an ultraviolet (UV) LED and appropriate phosphors is most desirable.
Hence, it is essential to develop efficient phosphors to convert the near-UV pump light
with a range of 300-400 nm into the visible wavelength. In order to fabricate excellent
WLEDs, the excitation wavelength of the red phosphors should match the emission of
the near UV-LEDs (350-410 nm) or blue LEDs (440-470 nm). Therefore, the phosphor
materials play an important role in WLEDs. Most vanadates exhibit intense broadband
emission from400 nm to 700 nmunder UV excitation because of tetrahedral VO4 with Td
symmetry. The broadband emission spectra of vanadate phosphors are due to the charge
transfer (CT) of an electron from the oxygen 2p orbital to the vacant 3d orbital of V
5+
in
tetrahedral VO
4
with Td symmetry. The luminescence is attributed to the
3
T
2
→
1
A
1
and
3
T
1
→
1
A
1
transitions. The preparation and photoluminescent properties of orthovanadate
are M3–3x/2(VO4)2:xEu(0.01≤x≤0.09 for M=Ca and 0.03 for M=Sr and Ba) reported.
The vanadate phosphors powder is synthesized using the solution combustion method.
These phosphors are annealed at different temperatures and the impact of temperature is
clearly seen on particle size. The particles become larger with increasing temperature and
reach maximum at 1050, 1150 and 1250
o
C for Ca, Sr and Ba host, respectively. Eventually,
the photoluminescence properties of these compounds under near UV-excitation are
expected to make them applicable as efficient and novel luminescent materials for white
light LED.
Biography
K N Shinde has completed his PhD from RTM Nagpur University, India and Postdoctoral studies in Nanotechnology
and Advanced Materials Engineering, Sejong University, Seoul, South Korea. Presently, he is an Assistant
Professor and the Director of R&D at N.S. Science and Arts College, India. He has published more than 50
papers in reputed journals and serving as an Editorial/Reviewer of international journals. His research interests
are synthesis of nanocrystalline materials and exploring novel materials and study their PL properties. He has
published a book entitled
Phosphate Phosphors for Solid State
Lighting with international publisher Springer series
in material science. He is an active member of International Centre for Diffraction Data (ICDD), USA.
kartik_shinde@rediffmail.comK N Shinde
Neelkanthrao Shinde Science and Arts
College, India
K N Shinde, Nano Res Appl 2017, 3:4
DOI: 10.21767/2471-9838-C1-004
Proteomics Meeting 2017