XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
277
T4: P–10
Spectroscopy and energy transfer in lead borate glasses
doubly doped with Tm
3+
and Dy
3+
ions
Agata Górny
1
, Marta Sołtys
1
, Joanna Pisarska
1
, and Wojciech A. Pisarski
1
1
Institute of Chemistry, University of Silesia, Szkolna 9, 40-007 Katowice, Poland,
e-mail: agata.gorny@smcebi.edu.pl
In recently years, the rare earth-doped inorganic glasses are very popular amorphous
matrices due to their interesting spectroscopic properties. The luminescence properties of glasses
doped with rare earth ions depend on the chemical composition of the glass-host and activator
(rare earth) concentration. The previously published work suggests that glasses doubly doped
with Tm
3+
and Dy
3+
are interesting for future applications [1–3].
In this work, the luminescent glass materials containing rare earth ions were obtained. Lead
borate glasses doubly doped with Tm
3+
and Dy
3+
were prepared by traditional melt-quenching
technique. The emission spectra of rare earths in lead borate glass were registered under
different excitation wavelengths. The observed emission bands are located in the visible spectral
region. They correspond to
1
D
2
→
3
F
4
(blue) and
1
G
4
→
3
H
6
(blue) transitions of Tm
3+
as well as
4
F
9/2
→
6
H
15/2
(blue),
4
F
9/2
→
6
H
13/2
(yellow) and
4
F
9/2
→
6
H
11/2
(red) transitions of Dy
3+
, respectively.
Moreover, the energy transfer process from Tm
3+
to Dy
3+
was observed. The luminescence
bands originating to characteristic transitions of thulium and dysprosium ions are present on
emission spectra under direct excitation of Tm
3+
. Luminescence lifetimes for the excited states
of Tm
3+
and Dy
3+
ions were also determined based on decay measurements. In general, the
luminescence spectra and their decays depend on the relative concentrations of the optically
active dopants.
Keywords: energy transfer; Tm
3+
and Dy
3+
ions; inorganic glasses
Acknowledgment
The National Science Centre (Poland) supported this work under research project 2015/17/B/ST7/03730.
References
[1] G. Chen, L. Yao, H. Zhong, S. Cui, J. Lumin. 178 (2016) 6.
[2] Y. Tian, R. Xu, Y. Guo, M. Li, L. Hu, J. Zhang, J. Lumin. 132 (2012) 1873.
[3] S. Liu, G. Zhao, X. Lin, H. Ying, J. Liu, J. Wang, G. Han, J. Solid State Chem. 181 (2008) 2725.
XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
278
T4: P–11
Synthesis and photochemistry studies of new highly fluorescent
molecular probes for monitoring the polymerization reaction
Joanna Ortyl
1
, Monika Topa
1
, Maciej Pilch
1
, Anna Chachaj-Brekiesz
2
,
Mariusz Galek
3
, Filip Petko
3
, and Roman Popielarz
1
1
Faculty of Chemical Engineering and Technology, Cracow University of Technology, Warszawska
24, 30-155 Cracow, Poland, e-mail: jortyl@chemia.pk.edu.pl
2
Faculty of Chemistry, Jagiellonian University, R. Ingardena 3, 30-060 Cracow, Poland
3
Photo HiTech Ltd., Life Science Park, M. Bobrzyńskiego 14, 30-348 Cracow, Poland
Study of molecular environment of small molecules by fluorescence methods becomes more
and more important in many areas of life sciences and chemical technologies, such as medicine
and biology for study of components of leaving cells and tissues, determination of DNA
sequences and antibodies, as well as for study of polymers and polymerization processes.
Intensive developments and applications of fluorescent molecular sensors, called probes, in
polymer chemistry started in the eighties of XX century, when advancements in construction of
appropriate rapid scan fluorimeters and automatic data acquisition systems using
microcomputers accelerated that growth.
Theoretically, every chemical or physical process and parameters, where changes of
physicochemical properties of the system studied occur, can be monitored using appropriate
molecular sensors. However, depending on the system type, different probes are required. Not
all luminescing compounds are suitable for application as probes. Only some fluorophors are
sensitive to changes of physicochemical properties of their environment. The probes applicable
for polymeric materials processes usually respond to changes in polarity and/or microviscosity
occurring in the polymerizing system. Nevertheless, there are no versatile probes suitable for
every polymerization type. The probes that work well in systems polymerized by free radical
polymerization usually are not good enough for the systems polymerized by cationic
polymerization. Therefore, careful design of the probe structure usually is required for specific
applications. For example, to-date only several fluorescent probes suitable for monitoring
cationic polymerization have been developed. Other types of polymerization, such as thiol-ene
addition polymerization, or hybrid polymerization processes have never been monitored by the
FPT method, because of the lack of suitable probes.
There are several requirements that fluorescent probes must meet to be useful for monitoring
polymerization reactions. The probe should have a high absorption coefficient, high
fluorescence quantum yield and large Stokes shift to avoid fluorescence self-absorption. In
addition, if the probe is to be used for following photoinduced polymerizations the absorption
of the probe should not interfere with the absorption of the photoinitiator and the probe should
be photochemically stable under curing conditions (irradiation wavelength and irradiation
time).
We present in this work a new fluorescent probes which can be used to follow
photopolymerization processes in full conversion range of monomers. The aim of the work is to
study the influence of the structure of the probes in their sensing properties. The properties of
the new probes have been compared with those of the classical probes.
Keywords: luminescence; molecular probe; fluorescence
Acknowledgment
This work was supported by the Foundation for Polish Science (Warsaw, Poland) within the project
POWROTY (Contract No. POWROTY/2016-1/4).
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