Photoconducting film compositions based on cobalt (II) and nickel (II) octanoates doped by cationic
and(or) anionic polymethine dyes are obtained. Their electric and photoconductive properties are investigated.
Anomalous for semiconductor materials peculiarities of the photocurrent were observed in these composites.
Effect of memory of preliminary illumination with light was observed in the obtained films. The
scheme of non-equilibrium charge carriers photogeneration process in these compositions are suggested.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3528

Ankin, A.N.

Davidenko, I.I.

Davidenko, N.A.

Ishchenko, A.A.

Kostenko, L.I.

Mokrinskaya, E.V.

Studzinsky, S.L.

Tonkopieva, L.S.

SocioEconomic Challenges Journal (Sumy State University)

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE NANOMATERIALS: APPLICATIONS AND PROPERTIES 
Vol. 1 No 4, 04NEA12(3pp) (2012) 
 
 
2304-1862/2012/1(4)04NEA12(3) 04NEA12-1  2012 Sumy State University 
Photoconductive Composite Films Based on Cobalt (II) and Nickel (II) Organic Salts  
Doped with Polymethine Dyes 
 
S.L. Studzinsky1,*, N.A. Davidenko1,†, I.I. Davidenko1, A.A. Ishchenko2, L.I. Kostenko3, A.N. Ankin1 
E.V. Mokrinskaya1, L.S. Tonkopieva1 
 
1 Kiev Taras Shevchenko National University, Volodymyrs’ka Str., 64, 01601 Kyiv. Ukraine 
2 Institute of Organic Chemistry NAS of Ukraine, Murmans’ka Str., 5, 02094 Kyiv, Ukraine 
3 L.M. Litvinenko Institute of Physical Organic and Coal Chemistry NAS of Ukraine,  
R. Luxemburg Str., 70, 83001 Donetsk, Ukraine 
 
(Received 23 June 2012; published online 12 August 2012) 
 
Photoconducting film compositions based on cobalt (II) and nickel (II) octanoates doped by cationic 
and(or) anionic polymethine dyes are obtained. Their electric and photoconductive properties are investigat-
ed. Anomalous for semiconductor materials peculiarities of the photocurrent were observed in these compo-
sites. Effect of memory of preliminary illumination with light was observed in the obtained films. The 
scheme of non-equilibrium charge carriers photogeneration process in these compositions are suggested. 
 
Keywords: Photoconductivive composites, Dyes, Photocurrent kinetics, Photogeneration, Charge carriers. 
 
  PACS numbers: 73.50.Pz, 73.50.Gr, 78.55.Qr, 78.66.Sq 
 
 
                                                          
* studzs@mail.ru 
† ndav@univ.kiev.ua 
1. INTRODUCTION 
 
The films of organic metal-containing composites 
(FC) doped with organic dyes are commonly used in 
photonics media [1-3]. In FC monomeric dye molecules 
play role of centers of light absorption and photogener-
ation of non-equilibrium charge carriers. Considerable 
progress is reached in control of photophysical and elec-
trophysical properties of FC by adjustment of chemical 
structure of the dye and composite-matrix. The polyme-
thine dyes [11] are the most interesting amongst organ-
ic dyes for photonics applications. The work is aimed in 
obtaining of new cobalt- and nickel-contained film com-
posites doped with low concentration of organic dyes 
and investigation of their photoconductive properties. 
 
2. THE SAMPLES AND  EXPERIMENTAL 
TECHNIQUE 
 
Cobalt (II) and nickel (II) octanoates (M1 and M2) 
as well as anionic (Dye1) and cationic (Dye2) polyme-
thine dyes were used as FC components.  
The samples were prepared as the structures with 
free surface [glass substrate – electroconducting 
SnO2 : In2O3 (ITO) layer – FC] and sandwich-structures 
[glass substrate – electroconducting ITO layer – FC – 
Ag]. Concentration (N) of Dye was 1 mas.%, FC thick-
ness was ~2 m. 
The technique of measurement of optical density (D) 
within the range λ = 400 – 800 nm, density (jPH) of pho-
tocurrent is described in [2, 12]. Green light-emitting 
diode with maximum of irradiation at λ1 = 540 nm was 
used for investigation of photoconducting properties of 
FC. Parameters δDE = (DE - D0)/D0 and δILE  = (ILE -
 IL0)/IL0, where D0 and IL0 are the values D and IL before 
application of the field (E), DE and ILE are the values D 
and IL after application of the field, were calculated 
using experimental results. Light intensity (I) at λ1 and 
 
 
 
λ2 was changed by neutral light filters within the range 
1 – 50 W/m2. The value of electric voltage (U) which 
was applied to electric contacts in the samples of sand-
wich-structure was changed within the range 1 – 200 
V. For measurements of fluorescence spectra and for 
excitation of fluorescence in FPC spectral fluorometer 
Solar CM2203 was used. All measurements were done 
at room temperature which corresponds to conditions of 
FPC practical applications. 
Quantum-chemical calculations of molecules N-
methylcarbazole (as a model monomer of PEPC) and 
anion An5 were done by non-empirical method 
DFT/B3LYP in 6-31G(d,p) basis using program package 
PC Gamess/Firefly [13]. 
 
 S.L. STUDZINSKY, N.A. DAVIDENKO, I.I. DAVIDENKO, ET AL. PROC. NAP 1, 04NEA12 (2012) 
 
 
04NEA12-2 
3. EXPERIMENTAL RESULTS AND DISCUS-
SION 
 
In the samples of sandwich-structure based on M1- 
and M2-films without dyes-additives photocurrent was 
not observed. In the samples with 1 mas. % dye photo-
current was observed both for  Dye1 and for Dye2. In 
the samples with N = 10 mas. % An5 for U = 100 V, I = 
50 W/m2 the value jPH is 10-3 А/m2 under illumination 
with light with λ1 and 2·10-4 А/m2 under illumination 
with light with λ2.  
In the similar structures with PVB photocurrent was 
not observed. Dependencies jPH on U can be described 
by analytical function jPH ~ U
PHm
, which is usually 
used for analysis of currents in semiconductor materi-
als. Power exponent mPH ≈ 2.1 for λ1 and 1.4 for λ2. The 
value jPH weakly depend on polarity U. The dependen-
cies of jPH on I with λ1 and λ2 are close to linear. The 
last fact means that effect of photoconductivity which 
is not caused by two-quantum processes was discov-
ered.  
Discovered in the work photoeffect is unusual. It 
can not be explained by formation of electron-hole 
pairs (EHP) caused by electron transfer from carbazole 
fragment PEPC to excited molecule An5 due to differ-
ence HOMO energy (HOMO energy of the polymer 
which was calculated for N-methylcarbazole is –
5.3280 еV and it is –2.2205 eV for An5 anion).  
Additional investigations were carried out for de-
termination of reasons of appearance of inner photoef-
fect upon growth of An5 concentration. Influence of 
external electric field on spectra of absorption and pho-
toluminescence was observed in all investigated sam-
ples based on PEPC (Fig.1).  
When electric field is switched on the values D0 and 
IL0 reach the values DE and ILE during time interval ~ 
1 s, which is close to time of electric charge of geomet-
ric capacity of the sample. After electric field switching 
off all changes of spectra stop. Peculiarities of spectra 
changes depend on dye concentration. In FPC with 
N < 5 mas. % when electric field is switched off within 
short wavelength range absorption intensity increases 
(δDE > 0), intensity of photoluminescence decreases 
(δILE < 0). Within the long wavelength range the ef-
fects are opposite (δDE < 0, δILE > 0) (Fig.1, c). Earlier 
[2, 14] the similar changes were observed in photocon-
ducting and non-photoconducting FPC with low con-
centration of symmetric polymethine dyes. These 
changes were explained by intramolecular redistribu-
tion of electronic density under influence of external 
electric field. But we have ascertained that upon N 
growth the dependency δDE (λ) does not change 
whereas the dependency δILE(λ) essentially trans-
forms. The last fact reveals itself in quenching of lu-
minescence upon application of electric field (δILE < 0) 
in FPC with N  > 5 mas. %. This quenching increases 
upon N growth (Fig.1, d). That corresponds to the 
model considerations described in [1, 2]. Luminescence 
quenching of organic dyes in photoconducting FPC 
under electric field influence is explained by formation 
and dissociation of EHP, namely by decrease of proba-
bility of radiative recombination of EHP. 
growth of intensity of short wavelength band of 
creates conditions for higher reaction ability as com-
pare to the state S0. Possibility of such mechanism is 
confirmed by quantum-chemical calculations. Upon 
formation of neutral radical (An5•) HOMO energy 
decreases until –6.0138 eV. This value is lower than 
HOMO of N-methilcarbazole (–5.3280 eV0. Thus, the 
radical An5• can play role of effective acceptor of elec-
tron from carbazole fragment of PEPC. It can create 
positive charge carrier – hole.  
Effect of FPC photoconductivity on the light wave-
length λ2 also is unusual. The matter is, that λ2 is out-
side the absorption band of An5 monomer. Therefore, 
irradiation of He-Ne laser can not involve inner photo-
effect in FPC. Unusual is also kinetics of the photocur-
rent jPH(t) (Fig.2, c and Fig.2, d) with slow growth of 
photocurrent and quite quick its relaxation when illu-
mination is ceased. The kinetics of photocurrent is the 
same for different values U and I. 
Addition of conductivity current jPH1 and jPH2 for 
stationary dark conductivity current is similar to ki-
netics of jPH change. 
 
4. CONCLUSIONS 
 
Investigations of electroconducting and photocon-
ducting properties of the Co(II)- and Ni(II)-octanoates 
composite films doped with different types of polyme-
thine dyes (anionic and cationic) are carried out. Influ-
ence of external electric field on spectra of absorption 
and photoluminescence, electric and photoconductivity 
of PEPC films doped with anion dye is studied. Widen-
ing of absorption and photoluminescence bands, 
quenching of photoluminescence intensity, arising of 
photoconductivity effect within visible range of spec-
trum were observed upon growth of dye concentration. 
These effects can be explained by formation of associ-
ates of dye molecules. The reason of photoconductivity 
can be attributed to photogeneration and transport of 
charge carriers in the associates. 
 
 
 
 PHOTOCONDUCTIVE COMPOSITE FILMS BASED ON COBALT … PROC. NAP 1, 04NEA12 (2012) 
 
 
04NEA12-3 
      
 
Fig. 2 – Diagrams explaining the technique of measurements of jPH1 depending on time of delay t1 of electric field application after 
start of illumination of the samples with light (a), Diagrams explaining method of change of jPH2 depending on time interval t2 of 
delay of application of electric field after illumination is ceased (b), kinetics of photocurrents jPH and jPH1 for different t1 values (c) 
and kinetics of photocurrents jPH and jPH2 for different t2 values (d) 
 
 
 
REFERENCES 
 
1. N. Davidenko, A. Ishchenko, N. Kuvshynsky, Photonics of 
Molecular Semiconducting Composites Based on Organic 
Dyes (Kyiv: Naukova Dumka: 2005). 
2. N.A. Davidenko, N.A. Derevyanko, A.A. Ishchenko, 
S.L. Studzinsky, V.A. Pavlov, A.D. Chetyrkin, 
N.G. Chuprina, Opt. Spectrosc. 106 No2, 229 (2009). 
3. N.A. Davidenko, S.V. Dehtyarenko, Yu.P. Getmanchuk, 
A.A. Ishchenko, A.V. Kozinetz, L.I. Kostenko, 
E.V. Mokrinskaya, S.L. Studzinskii, V.A. Skryshevskii, 
N.A. Skulskii, O.V. Tretyak, N.G. Chuprina, Semiconduc-
tors 43 No11, 1473 (2009). 
4. A.A. Ishchenko, G.P. Grabchuk, Theor. Exp. Chem. 45 
No3, 143 (2009). 
5. N.A. Davidenko, S.V. Dehtyarenko, A.V. Kozinetz, 
A.S. Lobach, E.V. Mokrinskaya, V.A. Skryshevsky, 
N.G. Spitsyna, S.L. Studzinsky, O.V. Tretyak, 
L.S. Tonkopiyeva, Tech. Phys. 56 No2, 259 (2011). 
6. Physics of Organic Semiconductors (Ed. V. Brutting) (Wein-
heim: WILEY-VCH Verlag GmbH & Co. KGaA: 2005). 
7. N.A. Davidenko, V.A. Skryshevsky, A.A. Ishchenko, 
A.Yu. Karlash, E.V. Mokrinskaya, Semiconductors 43 
No5, 640 (2009). 
8. R. Naaman, D.N. Beratan, D.H. Waldeck, Electronic and 
Magnetic Properties of Chiral Molecules and Supramolecu-
lar Architectures (London - New York: Springer: 2011). 
9. Photophysics of Molecular Materials (Ed. G. Lanzani) 
(Weinheim: WILEY-VCH Verlag GmbH & Co. KGaA: 
2006). 
10. V. Agranovich, Thin Films and Nanostructures Electronic 
Excitations in Organic Based Nanostructures, Volume 31 
(New York: Elsevier Academic Press: 2003). 
11. A. Ishchenko, Structure and Spectral-Luminescent Proper-
ties of Polymethine Dyes (Kyiv: Naukova Dumka: 1994). 
12. N.A. Davidenko, M.A. Zabolotny, A.A. Ishchenko, Spectro-
chim. Acta A, 61, 213 (2005). 
13. http://classic.chem.msu.su/gran/firefly/index.html. 
14. N.A. Davidenko, N.A. Derevyanko, A.A. Ishchenko, 
S.L. Studzinsky, Theor. Exp. Chem. 44 No6, 351 (2008). 
 


English

Photoconductive Composite Films Based on Cobalt (II) and Nickel (II) Organic Salts Doped with Polymethine Dyes

Electronic Sumy State University Institutional Repository

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE NANOMATERIALS: APPLICATIONS AND PROPERTIES Vol. 1 No 4, 04NEA12(3pp) (2012)   2304-1862/2012/1(4)04NEA12(3) 04NEA12-1  2012 Sumy State University Photoconductive Composite Films Based on Cobalt (II) and Nickel (II) Organic Salts  Doped with Polymethine Dyes  S.L. Studzinsky1,*, N.A. Davidenko1,†, I.I. Davidenko1, A.A. Ishchenko2, L.I. Kostenko3, A.N. Ankin1 E.V. Mokrinskaya1, L.S. Tonkopieva1  1 Kiev Taras Shevchenko National University, Volodymyrs’ka Str., 64, 01601 Kyiv. Ukraine 2 Institute of Organic Chemistry NAS of Ukraine, Murmans’ka Str., 5, 02094 Kyiv, Ukraine 3 L.M. Litvinenko Institute of Physical Organic and Coal Chemistry NAS of Ukraine,  R. Luxemburg Str., 70, 83001 Donetsk, Ukraine  (Received 23 June 2012; published online 12 August 2012)  Photoconducting film compositions based on cobalt (II) and nickel (II) octanoates doped by cationic and(or) anionic polymethine dyes are obtained. Their electric and photoconductive properties are investigat-ed. Anomalous for semiconductor materials peculiarities of the photocurrent were observed in these compo-sites. Effect of memory of preliminary illumination with light was observed in the obtained films. The scheme of non-equilibrium charge carriers photogeneration process in these compositions are suggested.  Keywords: Photoconductivive composites, Dyes, Photocurrent kinetics, Photogeneration, Charge carriers.    PACS numbers: 73.50.Pz, 73.50.Gr, 78.55.Qr, 78.66.Sq                                                             * studzs@mail.ru † ndav@univ.kiev.ua 1. INTRODUCTION  The films of organic metal-containing composites (FC) doped with organic dyes are commonly used in photonics media [1-3]. In FC monomeric dye molecules play role of centers of light absorption and photogener-ation of non-equilibrium charge carriers. Considerable progress is reached in control of photophysical and elec-trophysical properties of FC by adjustment of chemical structure of the dye and composite-matrix. The polyme-thine dyes [11] are the most interesting amongst organ-ic dyes for photonics applications. The work is aimed in obtaining of new cobalt- and nickel-contained film com-posites doped with low concentration of organic dyes and investigation of their photoconductive properties.  2. THE SAMPLES AND  EXPERIMENTAL TECHNIQUE  Cobalt (II) and nickel (II) octanoates (M1 and M2) as well as anionic (Dye1) and cationic (Dye2) polyme-thine dyes were used as FC components.  The samples were prepared as the structures with free surface [glass substrate – electroconducting SnO2 : In2O3 (ITO) layer – FC] and sandwich-structures [glass substrate – electroconducting ITO layer – FC – Ag]. Concentration (N) of Dye was 1 mas.%, FC thick-ness was ~2 m. The technique of measurement of optical density (D) within the range λ = 400 – 800 nm, density (jPH) of pho-tocurrent is described in [2, 12]. Green light-emitting diode with maximum of irradiation at λ1 = 540 nm was used for investigation of photoconducting properties of FC. Parameters δDE = (DE - D0)/D0 and δILE  = (ILE - IL0)/IL0, where D0 and IL0 are the values D and IL before application of the field (E), DE and ILE are the values D and IL after application of the field, were calculated using experimental results. Light intensity (I) at λ1 and    λ2 was changed by neutral light filters within the range 1 – 50 W/m2. The value of electric voltage (U) which was applied to electric contacts in the samples of sand-wich-structure was changed within the range 1 – 200 V. For measurements of fluorescence spectra and for excitation of fluorescence in FPC spectral fluorometer Solar CM2203 was used. All measurements were done at room temperature which corresponds to conditions of FPC practical applications. Quantum-chemical calculations of molecules N-methylcarbazole (as a model monomer of PEPC) and anion An5 were done by non-empirical method DFT/B3LYP in 6-31G(d,p) basis using program package PC Gamess/Firefly [13].   S.L. STUDZINSKY, N.A. DAVIDENKO, I.I. DAVIDENKO, ET AL. PROC. NAP 1, 04NEA12 (2012)   04NEA12-2 3. EXPERIMENTAL RESULTS AND DISCUS-SION  In the samples of sandwich-structure based on M1- and M2-films without dyes-additives photocurrent was not observed. In the samples with 1 mas. % dye photo-current was observed both for  Dye1 and for Dye2. In the samples with N = 10 mas. % An5 for U = 100 V, I = 50 W/m2 the value jPH is 10-3 А/m2 under illumination with light with λ1 and 2·10-4 А/m2 under illumination with light with λ2.  In the similar structures with PVB photocurrent was not observed. Dependencies jPH on U can be described by analytical function jPH ~ UPHm, which is usually used for analysis of currents in semiconductor materi-als. Power exponent mPH ≈ 2.1 for λ1 and 1.4 for λ2. The value jPH weakly depend on polarity U. The dependen-cies of jPH on I with λ1 and λ2 are close to linear. The last fact means that effect of photoconductivity which is not caused by two-quantum processes was discov-ered.  Discovered in the work photoeffect is unusual. It can not be explained by formation of electron-hole pairs (EHP) caused by electron transfer from carbazole fragment PEPC to excited molecule An5 due to differ-ence HOMO energy (HOMO energy of the polymer which was calculated for N-methylcarbazole is –5.3280 еV and it is –2.2205 eV for An5 anion).  Additional investigations were carried out for de-termination of reasons of appearance of inner photoef-fect upon growth of An5 concentration. Influence of external electric field on spectra of absorption and pho-toluminescence was observed in all investigated sam-ples based on PEPC (Fig.1).  When electric field is switched on the values D0 and IL0 reach the values DE and ILE during time interval ~ 1 s, which is close to time of electric charge of geomet-ric capacity of the sample. After electric field switching off all changes of spectra stop. Peculiarities of spectra changes depend on dye concentration. In FPC with N < 5 mas. % when electric field is switched off within short wavelength range absorption intensity increases (δDE > 0), intensity of photoluminescence decreases (δILE < 0). Within the long wavelength range the ef-fects are opposite (δDE < 0, δILE > 0) (Fig.1, c). Earlier [2, 14] the similar changes were observed in photocon-ducting and non-photoconducting FPC with low con-centration of symmetric polymethine dyes. These changes were explained by intramolecular redistribu-tion of electronic density under influence of external electric field. But we have ascertained that upon N growth the dependency δDE (λ) does not change whereas the dependency δILE(λ) essentially trans-forms. The last fact reveals itself in quenching of lu-minescence upon application of electric field (δILE < 0) in FPC with N  > 5 mas. %. This quenching increases upon N growth (Fig.1, d). That corresponds to the model considerations described in [1, 2]. Luminescence quenching of organic dyes in photoconducting FPC under electric field influence is explained by formation and dissociation of EHP, namely by decrease of proba-bility of radiative recombination of EHP. growth of intensity of short wavelength band of creates conditions for higher reaction ability as com-pare to the state S0. Possibility of such mechanism is confirmed by quantum-chemical calculations. Upon formation of neutral radical (An5•) HOMO energy decreases until –6.0138 eV. This value is lower than HOMO of N-methilcarbazole (–5.3280 eV0. Thus, the radical An5• can play role of effective acceptor of elec-tron from carbazole fragment of PEPC. It can create positive charge carrier – hole.  Effect of FPC photoconductivity on the light wave-length λ2 also is unusual. The matter is, that λ2 is out-side the absorption band of An5 monomer. Therefore, irradiation of He-Ne laser can not involve inner photo-effect in FPC. Unusual is also kinetics of the photocur-rent jPH(t) (Fig.2, c and Fig.2, d) with slow growth of photocurrent and quite quick its relaxation when illu-mination is ceased. The kinetics of photocurrent is the same for different values U and I. Addition of conductivity current jPH1 and jPH2 for stationary dark conductivity current is similar to ki-netics of jPH change.  4. CONCLUSIONS  Investigations of electroconducting and photocon-ducting properties of the Co(II)- and Ni(II)-octanoates composite films doped with different types of polyme-thine dyes (anionic and cationic) are carried out. Influ-ence of external electric field on spectra of absorption and photoluminescence, electric and photoconductivity of PEPC films doped with anion dye is studied. Widen-ing of absorption and photoluminescence bands, quenching of photoluminescence intensity, arising of photoconductivity effect within visible range of spec-trum were observed upon growth of dye concentration. These effects can be explained by formation of associ-ates of dye molecules. The reason of photoconductivity can be attributed to photogeneration and transport of charge carriers in the associates.     PHOTOCONDUCTIVE COMPOSITE FILMS BASED ON COBALT … PROC. NAP 1, 04NEA12 (2012)   04NEA12-3        Fig. 2 – Diagrams explaining the technique of measurements of jPH1 depending on time of delay t1 of electric field application after start of illumination of the samples with light (a), Diagrams explaining method of change of jPH2 depending on time interval t2 of delay of application of electric field after illumination is ceased (b), kinetics of photocurrents jPH and jPH1 for different t1 values (c) and kinetics of photocurrents jPH and jPH2 for different t2 values (d)    REFERENCES  1. N. Davidenko, A. Ishchenko, N. Kuvshynsky, Photonics of Molecular Semiconducting Composites Based on Organic Dyes (Kyiv: Naukova Dumka: 2005). 2. N.A. Davidenko, N.A. Derevyanko, A.A. Ishchenko, S.L. Studzinsky, V.A. Pavlov, A.D. Chetyrkin, N.G. Chuprina, Opt. Spectrosc. 106 No2, 229 (2009). 3. N.A. Davidenko, S.V. Dehtyarenko, Yu.P. Getmanchuk, A.A. Ishchenko, A.V. Kozinetz, L.I. Kostenko, E.V. Mokrinskaya, S.L. Studzinskii, V.A. Skryshevskii, N.A. Skulskii, O.V. Tretyak, N.G. Chuprina, Semiconduc-tors 43 No11, 1473 (2009). 4. A.A. Ishchenko, G.P. Grabchuk, Theor. Exp. Chem. 45 No3, 143 (2009). 5. N.A. Davidenko, S.V. Dehtyarenko, A.V. Kozinetz, A.S. Lobach, E.V. Mokrinskaya, V.A. Skryshevsky, N.G. Spitsyna, S.L. Studzinsky, O.V. Tretyak, L.S. Tonkopiyeva, Tech. Phys. 56 No2, 259 (2011). 6. Physics of Organic Semiconductors (Ed. V. Brutting) (Wein-heim: WILEY-VCH Verlag GmbH & Co. KGaA: 2005). 7. N.A. Davidenko, V.A. Skryshevsky, A.A. Ishchenko, A.Yu. Karlash, E.V. Mokrinskaya, Semiconductors 43 No5, 640 (2009). 8. R. Naaman, D.N. Beratan, D.H. Waldeck, Electronic and Magnetic Properties of Chiral Molecules and Supramolecu-lar Architectures (London - New York: Springer: 2011). 9. Photophysics of Molecular Materials (Ed. G. Lanzani) (Weinheim: WILEY-VCH Verlag GmbH & Co. KGaA: 2006). 10. V. Agranovich, Thin Films and Nanostructures Electronic Excitations in Organic Based Nanostructures, Volume 31 (New York: Elsevier Academic Press: 2003). 11. A. Ishchenko, Structure and Spectral-Luminescent Proper-ties of Polymethine Dyes (Kyiv: Naukova Dumka: 1994). 12. N.A. Davidenko, M.A. Zabolotny, A.A. Ishchenko, Spectro-chim. Acta A, 61, 213 (2005). 13. http://classic.chem.msu.su/gran/firefly/index.html. 14. N.A. Davidenko, N.A. Derevyanko, A.A. Ishchenko, S.L. Studzinsky, Theor. Exp. Chem. 44 No6, 351 (2008).  

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Photoconductive Composite Films Based on Cobalt (II) and Nickel (II) Organic Salts Doped with Polymethine Dyes

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