Aggregate Formation of Boron-Containing Molecules in Thermal Vacuum Deposited Films
The spectral properties of new boron-containing dyes were studied. One-component (pure dyes) and composite “Alq<sub>3</sub>+dye” thin films were fabricated using the thermal vacuum deposition method. The positions of the transmission spectra maxima in a one-component film are different f...
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| author | Oleksandr Navozenko Valeriy Yashchuk Oleksiy Kachkovsky Dalius Gudeika Rita Butkute Yuriy Slominskii Volodymyr Azovskyi |
| author_facet | Oleksandr Navozenko Valeriy Yashchuk Oleksiy Kachkovsky Dalius Gudeika Rita Butkute Yuriy Slominskii Volodymyr Azovskyi |
| author_sort | Oleksandr Navozenko |
| collection | DOAJ |
| description | The spectral properties of new boron-containing dyes were studied. One-component (pure dyes) and composite “Alq<sub>3</sub>+dye” thin films were fabricated using the thermal vacuum deposition method. The positions of the transmission spectra maxima in a one-component film are different for different film thicknesses. The best correlation of the maxima positions of the dye transmission spectra in solid and liquid solutions was observed for thicknesses of films close to a few (up to 10) monolayers. On the other hand, the absorption spectra maxima positions of one-component dye films (upper 10 nm) and composite films with high concentration, did not match the corresponding positions of absorption spectra maxima recorded in solutions. Comparison of the absorption spectra in one-component dye films and in solutions indicates the presence of both monomers and their aggregates in one-component films (contrary to solutions where such processes of aggregation do not take place, even at very high concentrations). Simultaneously with aggregation manifestation in the absorption spectra, the intensity of fluorescence of one-component dye films dramatically decreases. A quantum chemical simulation of the possible relative arrangement of two dye molecules indicates that the most possible of the simplest types of aggregates are physical dimers. Films of practical importance (due to efficient energy transfer from host to guest molecules when all singlet excitons are captured) possess a high quantum yield of fluorescence when reaching an impurity concentration of a few percent (aggregation does not take place yet). |
| first_indexed | 2024-03-10T06:57:04Z |
| format | Article |
| id | doaj.art-87a1b5393a484911ac12e5c700530705 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T06:57:04Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-87a1b5393a484911ac12e5c7005307052023-11-22T16:24:24ZengMDPI AGMaterials1996-19442021-09-011419561510.3390/ma14195615Aggregate Formation of Boron-Containing Molecules in Thermal Vacuum Deposited FilmsOleksandr Navozenko0Valeriy Yashchuk1Oleksiy Kachkovsky2Dalius Gudeika3Rita Butkute4Yuriy Slominskii5Volodymyr Azovskyi6Faculty of Physics, Taras Shevchenko National University of Kyiv, 64/13 Volodymyrs’ka Str., 01601 Kyiv, UkraineFaculty of Physics, Taras Shevchenko National University of Kyiv, 64/13 Volodymyrs’ka Str., 01601 Kyiv, UkraineV.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry, Murmanskaya Street, 1, 02660 Kyiv, UkraineDepartment of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu pl. 19, LT-50254 Kaunas, LithuaniaDepartment of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu pl. 19, LT-50254 Kaunas, LithuaniaInstitute of Organic Chemistry, National Academy of Sciences of Ukraine, 5 Murmanska Str., 02660 Kyiv, UkraineFaculty of Physics, Taras Shevchenko National University of Kyiv, 64/13 Volodymyrs’ka Str., 01601 Kyiv, UkraineThe spectral properties of new boron-containing dyes were studied. One-component (pure dyes) and composite “Alq<sub>3</sub>+dye” thin films were fabricated using the thermal vacuum deposition method. The positions of the transmission spectra maxima in a one-component film are different for different film thicknesses. The best correlation of the maxima positions of the dye transmission spectra in solid and liquid solutions was observed for thicknesses of films close to a few (up to 10) monolayers. On the other hand, the absorption spectra maxima positions of one-component dye films (upper 10 nm) and composite films with high concentration, did not match the corresponding positions of absorption spectra maxima recorded in solutions. Comparison of the absorption spectra in one-component dye films and in solutions indicates the presence of both monomers and their aggregates in one-component films (contrary to solutions where such processes of aggregation do not take place, even at very high concentrations). Simultaneously with aggregation manifestation in the absorption spectra, the intensity of fluorescence of one-component dye films dramatically decreases. A quantum chemical simulation of the possible relative arrangement of two dye molecules indicates that the most possible of the simplest types of aggregates are physical dimers. Films of practical importance (due to efficient energy transfer from host to guest molecules when all singlet excitons are captured) possess a high quantum yield of fluorescence when reaching an impurity concentration of a few percent (aggregation does not take place yet).https://www.mdpi.com/1996-1944/14/19/5615fluorescencedimersquantum chemical modelingthermal vacuum depositioncyanine dyesboron-containing molecules |
| spellingShingle | Oleksandr Navozenko Valeriy Yashchuk Oleksiy Kachkovsky Dalius Gudeika Rita Butkute Yuriy Slominskii Volodymyr Azovskyi Aggregate Formation of Boron-Containing Molecules in Thermal Vacuum Deposited Films Materials fluorescence dimers quantum chemical modeling thermal vacuum deposition cyanine dyes boron-containing molecules |
| title | Aggregate Formation of Boron-Containing Molecules in Thermal Vacuum Deposited Films |
| title_full | Aggregate Formation of Boron-Containing Molecules in Thermal Vacuum Deposited Films |
| title_fullStr | Aggregate Formation of Boron-Containing Molecules in Thermal Vacuum Deposited Films |
| title_full_unstemmed | Aggregate Formation of Boron-Containing Molecules in Thermal Vacuum Deposited Films |
| title_short | Aggregate Formation of Boron-Containing Molecules in Thermal Vacuum Deposited Films |
| title_sort | aggregate formation of boron containing molecules in thermal vacuum deposited films |
| topic | fluorescence dimers quantum chemical modeling thermal vacuum deposition cyanine dyes boron-containing molecules |
| url | https://www.mdpi.com/1996-1944/14/19/5615 |
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