Exciton diffusion coefficient and diffusion length determination in organic compounds

Unit: Faculty of Physics
Keywords: Exciton diffusion, diffusion length, amorphous, organic compound, fluorescence, organic electronics, OLED, solar cells, sensors

Exciton diffusion coefficient and diffusion length is determined by measuring fluorescence transients of samples with different concentration of fluorescence quencher (PCBM-fullerene derivative) and performing Monte Carlo simulation of 3D exciton diffusion in the investigating medium with a randomly distributed fluorescence quenchers.

One sample per measurement. Compounds should be amorphous and form molecular glasses, emit in the range from 196 nm to 957 nm, sufficiently absorb at 280 nm, 330 nm, 375 nm or 450 nm, dissolve in organic solvents.
Samples are prepared in N2 atmosphere for optical measurements. 

Application. Characterization of exciton diffusion coefficient and diffusion length of new organic compounds will enable to evaluate their potential for applications in organic electronic devices (organic light emitting diodes, organic solar cells, sensors).

Contacts: Dr. Karolis Kazlauskas, tel. +370 600 34126,