Kinetics of triplet excitation transport in disordered organic solids

The time dependence of triplet excitation energy transport in energetically disordered organic solids is studied. Contrary to the ensemble averaged hopping frequency v(t)similar tot(alpha(t)-1) with time dependent dispersion parameter alpha(t), we introduce the hopping rate in the form v(t)similar to(a+bt)(-1), without time dependent parameters. We show that such hopping rate leads to the power-like tail of luminescence decay function. The mechanism leading to time hierarchy in hopping phenomena is discussed. (C) 2003 Elsevier B.V. All rights reserved.