The Peculiarities of Singlet Electronic Excitation Energy Transfer Processes in Alq3 Films
The absorption and luminescence of new boron-containing dyes in two-component films of Alq3 (matrix)-dye(impurity) (obtained by the method of thermal vacuum deposition) are studied. The comparison of the spectra of absorption, fluorescence, and fluorescence excitation of a dyes in one-component solutions and double-component films shows the existence of the effective electronic excitation energy transfer (EEET) from the matrix to dye molecules. Time-resolved spectra of two-component films also manifest strong EEET in these systems. For the estimation of the average exciton spreading length in Alq3 films, the diffusion model of the motion of singlet excitons is used. The diffusion coefficient is evaluated using time-resolved spectroscopy. The optimum concentrations of dyes in a light-emitting layer of OLED are evaluated based on experimental data and the used model of EEET.
W. Brutting. Physics of Organic Semiconductors (Wiley-VCH, 2005) [ISBN: 3-527-40550-X]. https://doi.org/10.1002/3527606637
T. Takatoshi. OLED Display Fundamentals and Applications (Wiley, 2017) [ISBN: 9781119187493].
A. Shoustikov, Y. You, M. Thompson. Electroluminescence color tuning by dye doping in organic light-emitting diodes. IEEE J. Select. Topics Quant. Electr. 4, 3 (1998). https://doi.org/10.1109/2944.669454
O.D. Kachkovsky, V.M. Yashchuk, O.M. Navozenko, A.P. Naumenko, Yu.L. Slominskii. On the nature of the lowest electron transitions in the borine dye derivatives benz[c,d]indole. J. Mol. Struct. 1074, 589 (2014). https://doi.org/10.1016/j.molstruc.2014.06.054
V.M. Yashchuk, O.M. Navozenko, Yu.L. Slominskii, J.V. Grazulevicius, O.D. Kachkovsky, A.P. Naumenko. Peculiarities of electronic processes in high-fluorescence boron-containing composite films. Ukr. J. Phys. 59, 238 (2014). https://doi.org/10.15407/ujpe59.03.0238
J.R. Lakowicz. Principles of Fluorescence Spectroscopy (Springer, 2008) [ISBN: 978-0387-31278-1].
B. Valeur. Molecular Fluorescence: Principles and Applications (Wiley-VCH, 2001) [ISBN: 3-527-60024-8]. https://doi.org/10.1002/3527600248
O.M. Navozenko, V.M. Yashchuk, Yu.L. Slominskii, O.D. Kachkovsky, A.P. Naumenko, Y.O. Myagchenko. Photophysical properties of novel luminescent dyes: difluoroborate complexes of benz[c,d]indole derivates. Funct. Mater. 19, 504 (2012).
I.Ya Kucherov, O.M. Faidysh. Transfer of electron excitation energy in solid organic solutions. Rep. Acad. of Sci. of the Ukrainian SSR 1, 57 (1956).
Y. Tamai, H. Ohkita, H. Benten, S. Ito. Exciton diffusion in conjugated polymers: From fundamental understanding to improvement in photovoltaic conversion efficiency. Phys. Chem. Lett. 6, 3417 (2015). https://doi.org/10.1021/acs.jpclett.5b01147
O.M. Faidysh, V.M. Yashchuk, V.Ya. Pochynok, L.M. Fedorova. Influence of the migration of the electron excitation energy on the luminescence of N-vinylcarbazole and polyvinylcarbazole. Ukr. J. Phys. 21, 1528 (1976).
V.M. Yashchuk. Triplet excitons in п-electron containing polymers. Polimery, 7-8, 475 (1999). https://doi.org/10.14314/polimery.1999.475
Yu.N. Demikhov, O.M. Faidysh, V.M. Yashchuk. Luminescence and the transfer of the singlet excitation energy in a solid monomer of styrene. Optics and Spectroscopy 35, 646 (1973).
Yu.N. Demikhov, O.M. Faidysh, V.M. Yashchuk. The effect of energy transfer of electronic excitation on the luminescence of styrene monomer with an admixture of polystyrene. Optics and Spectroscopy 37, 686 (1974).
V.V. Agranovych, I.Ya Kucherov, O.M. Faidysh. Length of the diffusion displacement of excitons in anthracene crystals. Ukr. J. Phys. 2, 61 (1957).
O.M. Navozenko, V.M. Yashchuk, Yu.L. Slominskii. Peculiarities of energy transfer in thin films of tris(8-hydroxyquinolinato)aluminium complexes. Proceedings of the 18th International Young Scientists Conference "Optics and High-Technology Material Science" Devoted to the 95th Anniversary of Professor M. U. Bilyi (Kiev Univ., 2017).