N.H. Ibraev, D.A. Afanasyev, J.C. Smagulov

The results of study by the annihilation of triplet electronic excitations in clusters of aromatic molecules of 1,2-benzanthracene adsorbed in the pores of nano-sized silicate glasses with the pore sizes ranging from 2,5 to 11,1 nm are presented. Differences in the response of molecular photoexcitation depending on the diameter of the pores are discovered. The kinetics of the annihilation delayed fluorescence decay and the intensity modulation of an external magnetic field are studied. It is shown that the molecules of aromatic hydrocarbons in porous glass form clusters with the structure of the crystal and clusters with disordered distribution of molecules. The increase in pore size and the growth of concentration of organic impurities in them leads to the dominance of the crystalline components.