XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
98
T4: O–1
Up-conversion luminescence and μ-Raman investigations
of rare earth doped KGd(WO
4
)
2
powders
Dobroslawa Kasprowicz
1
, Paweł Głuchowski
2
, Maciej Chrunik
3
,
and Andrzej Majchrowski
3
1
Faculty of Technical Physics, Poznan University of Technology, Piotrowo 3, 60-965 Poznan,
Poland, e-mail: dobroslawa.kasprowicz@put.poznan.pl
2
Institute of Low Temperature and Structure Research of Polish Academy of Sciences, Okólna 2, 50-
422 Wroclaw, Poland
3
Institute of Applied Physics, Military University of Technology, Kaliskiego 2, 00-908 Warszawa,
Poland
Owing to their unique luminescence properties, the rare earth ions doped up-conversion
materials have been extensively studied in recent years and widely applied in optical devices
such as lasers, optical sensors [1] solar cells [2], light emitting diodes (LEDs) [3], 3D displays
[4] or optical amplifiers for fiber-optic communication. During the lecture the spectroscopic
properties of KGd(WO
4
)
2
micro-crystalline powders doped with selected Pr
3+
, Eu
3+
, Tb
3+
, Ho
3+
,
Er
3+
, Tm
3+
and/or Yb
3+
ions, studied by the μ-Raman spectroscopy and optical spectroscopy
methods, will be presented. In the proposed systems Yb
3+
ions were used as energy sensitizers
and the up-converted luminescence originated from the transitions between the energy levels of
other co-doped rare earth ions [5]. It was shown that all investigated systems exhibited
multicolor up-conversion fluorescence under 980 nm laser irradiation. The investigated
materials are very promising as a new generation energy converters with significant potential
applications in novel optical devices.
0
5000
10000
15000
20000
25000
30000
35000
450
500
550
600
650
700
750
800
850
L
u
m
in
e
s
c
e
n
c
e
I
n
te
n
s
it
y
/
a
.u
.
2473 mW
2295 mW
2117 mW
1879 mW
1701 mW
1522 mW
1284 mW
1106 mW
868 mW
690 mW
512 mW
Wavelength/ nm
KGW:Yb
3+
/Ho
3+
POWDER
Fig. 1. The luminescence spectra of KGW:Yb
3+
/Ho
3+
powders after excitation at 980 nm.
Keywords: tungstates; rare earths; up-conversion, Raman spectroscopy
Acknowledgment
This work was supported by the Research Project of the Polish Ministry of Sciences and Higher Education:
06/65/DSPB/5172.
References
[1] S. Sinha, M.K. Mahata, K. Kumar, RSC Adv. 6 (2016) 89642.
[2] N. Yao, J. Huang, K. Fu, X. Deng, M. Ding, X. Xu, RSC Adv, 6 (2016) 17546.
[3] X. Ding, Q. Wang, Y. Wang, Phys. Chem. Chem. Phys. 18 (2016) 8088.
[4] F. Qin, R. Chen, W. Huang, M. Hong, X. Liu, Nat. Nanotechnol. 10 (2015) 237.
[5] D. Kasprowicz, P. Głuchowski, M.G. Brik, M.M. Makowski, M. Chrunik, A. Majchrowski, J. Alloys.
Compd. 684 (2016) 271.
XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
99
T4: O–2
Optical fibers co-doped with rare-earth ions and nanoparticles
Marcin Kochanowicz
1
, Jacek Żmojda
1
, Piotr Miluski
1
, Renata Jadach
2
,
Maciej Sitarz
2
, and Dominik Dorosz
2
1
Department of Power Engineering, Photonics and Lighting Technology, Bialystok University of
Technology, 45D Wiejska Street,15-351 Bialystok, Poland, e-mail: j.zmojda@pb.edu.pl
2
Department of Silicate Chemistry and Macromolecular Compounds, AGH University of Science and
Technology, 30 Mickiewicza Av., 30-059 Krakow, Poland
Developing novel rare-earth ion (RE)-doped optical fibres for power amplifiers, lasers and
broadband amplified spontaneous emission sources requires continuous improvements in the
optical fiber technology. Perspective solution enabling enhancement of spectroscopic properties
of the laser glasses and optical fibers is dispersion of noble metal nanoparticles (NPs) in low
phonon energy, fiber core glass co-doped with RE. Enhancement of the luminescence can be
obtained in two ways: by energy transfer from noble metal to RE, by changing the local field of
the rare earth ions resulting from the surface plasmon resonance of interacting metallic
nanoparticles [1–3]. Key issues in fabrication of RE/NPs co-doped optical fibers are: selection
of glassy matrix, optimization of RE/NPs concentration and technology of formation of
nanoparticles. Antimony and germanate based glasses, due to their good capacity for dissolving
lanthanides and/or noble metal ions together with their relatively low phonon energies enable to
conduct effective local field effect, thus creating an attractive matrix for co-doping with RE and
metal nanoparticles (NPs). Moreover, good thermal stability makes them good candidates for
drawing optical fibers.
In the paper the effects of optical pumping diode-laser on luminescent properties of RE
(Yb
3+
/Ho
3+
, Yb
3+
/Tm
3+
, Yb
3+
/Eu
3+
) and RE/NPs (Er
3+
/Ag, Eu
3+
/Ag) co-doped antimony –
germinate optical fibers have been presented. Technological aspects of formation of
nanoparticles in optical fibers have been also discussed. Effect of parameters of heat treatment
(time and temperature) of the produced optical fibers on their luminescent properties, especially
RE – AgNPs interaction mechanisms under 395 nm laser excitation was analyzed. Analysis of
the possibility of formation of Ag nanoparticles during the optical fiber drawing process was
also presented.
Keywords: optical fiber; noble metal nanoparticles; surface plasmon resonance, RE ions
Acknowledgment
The project was funded by National Science Centre (Poland) granted on the basis of the decision No. DEC-
2016/21/D/ST7/03453. The COST Action MP1401 "Advanced fibre laser and coherent source as tools for
society, manufacturing and life science" is also acknowledged.
References
[1] M. Eichelbaum, K. Rademann, Adv. Funct. Mater. 19 (2009) 2045.
[2] M. Reza Dousti, M. R. Sahar, S. K. Ghoshal, R. J. Amjad, and A. R. Samavati, J. Mol. Struct. 1035
(2013) 6.
[3] O.L. Malta, P.A. Santa-Cruz, G.F. De Sá, F. Auzel, J. Lumin. 33 (1985) 261.
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