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Energetic disorder in disordered organic solids has been found to alter theirphysical parameters. Here, we have demonstrated, by means of Monte-Carlosimulation and experiments, that the electroluminescence (EL) spectrum isdependent on energetic disorder. This dependence has been attributed to thecharge carrier relaxation during hopping process. The dependence of EL spectrumon energetic disorder makes it temperature dependent and temperature dependencehas been found to vary with energetic disorder in a variety of materials. Thesimulation has been performed by taking the relaxation of charge carriers viatransport energy in the Gaussian density of states. An analytical equation wasestablished for spectral shift as a function of transport energy.

Effect of charge carrier relaxation during hopping process on electroluminescence in organic solids