Annual Report 2012 - Latvijas Universitātes Cietvielu fizikas institūts

investigated compounds in dilute
dichloromethane solution (black lines) and
neat films (gray lines).
Figure 5. Full width at half maximum (circles)
and ASE intensity (squares) as a function of
irradiation intensity for DWK-1, DWK-2,
JWK-1, ZWK-1 compounds in thin solid
film. Lines are guides for the eye.
The possibility of achieving amplified spontaneous emission in neat films of the glass
forming DCM derivatives bearing bulky side groups demonstrates their applicability for the
lasing applications despite a very low fluorescence quantum yield. However, a low fluorescence
quantum yield caused by short excited state lifetimes of the molecules in films sets limitations
on their applications. Such materials may be used for amplification or generation of short light
pulses under their excitation with also short light pulses. However, these materials are not
suitable for OLED fabrication or lasing under continuum wave excitation conditions.
All DCM derivatives bearing one donor group and different acceptor groups show similar
spectroscopic and light amplification properties Attachment of two bulky donor groups
negatively affects the light amplification properties of the compounds both in solutions and in
neat solid films. This negative influence is less expressed for DWK-2 compound, which shows
light amplification properties similar to those of DWK-1 compound. Amplification properties of
two other compounds ZWK-2 and JWK-2 revealed by transient absorption investigations are
much worse; consequently amplified spontaneous emission in neat films of these materials has
not been achieved.
Scientific publications
1. E. Nitiss, M. Rutkis, M. Svilans, Effects of the multiple internal reflection and
sample thickness changes on determination if electro-optica coefficient values of a
polymer film, Lithuanian Journal of Physics, Vol. 52, No. 1, pp. 30-38 (2012)
2. A.Vembris, E.Zarins, J.Jubels, V.Kokars, I.Muzikante, A.Miasojedovas,
S.Jursenas, Synthesis, thermal and optical properties of red luminescent glass
forming symmetric and non symmetric styryl-4H-pyran-4-ylidene fragment
containing derivatives, Optical Materials, 34, 2012, pp 1501 – 1506, doi:
10.1016/j.optmat.2012.02.051
3. A.Vembris, I.Muzikante, V.Gulbinas, R.Karpicz, G.Sliauzys, A.Miasojedovas,
S.Jursenas, Fluorescence and amplified spontaneous emission properties of glass
forming styryl-4H-pyran-4-ylidene fragment containing derivatives, Journal of
Luminescence, 132, No 9, 2012, pp 2421–2426, doi: 10.1016/j.jlumin.2012.03.063
4. V.Karitans, K.Kundzins, E.Laizane, M.Ozolinsh, L.Ekimane, Applicability of a
binary amplitude mask for creating correctors of higher-order ocular aberrations in a
photoresistive layer, Optical Engineering, Vol. 51, No. 7, 2012, pp. 078001
5. E. Nitišs, R. Usans, M. Rutkis, Simple method for measuring bilayer system optical
parameters, SPIE Proceedings, 8430, 84301C (2012), DOI: 10.1117/12.922317
6. E. Zarins, K. Siltane, E. Misina, V. Kokars, K. Lazdovica, A. Vembris, V. Kampars,
I. Muzikante, M. Rutkis, Synthesis, optical and thermal properties of glassy trityl
group containing luminescent derivatives of 2-tert-butyl-6-methyl-4H-pyran-4-one,
SPIE Proceedings, 8435, 84351Q, (2012), DOI: 10.1117/12.921996
116