The Peculiarities of Singlet Electronic Excitation Energy Transfer Processes in Alq3 Films

  • O. M. Navozenko Faculty of Physics, Taras Shevchenko National University of Kyiv
  • V. M. Yashchuk Faculty of Physics, Taras Shevchenko National University of Kyiv
  • Yu. P. Piryatinski Institute of Physics, Nat. Acad. of Sci. of Ukraine
  • D. Gudeika Department of Organic Technology, Kaunas University
  • A. P. Naumenko Faculty of Physics, Taras Shevchenko National University of Kyiv
  • Yu. L. Slominskii Institute of Organic Chemistry, Nat. Acad. of Sci. of Ukraine
Keywords: boron-containing cyanine dyes, vacuum deposition, Alq3-thin films, fluorescence, EEET, singlet excitons, OLED

Abstract

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.

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Published
2020-03-26
How to Cite
Navozenko, O., Yashchuk, V., Piryatinski, Y., Gudeika, D., Naumenko, A., & Slominskii, Y. (2020). The Peculiarities of Singlet Electronic Excitation Energy Transfer Processes in Alq3 Films. Ukrainian Journal of Physics, 65(3), 196. https://doi.org/10.15407/ujpe65.3.196
Section
Optics, atoms and molecules

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