| Abstract
| - The effect of substitution on hole mobility in N,N‘-bis(m-tolyl)-N,N‘-diphenyl-1,1‘-biphenyl-4,4‘-diamine (TPD) derivatives doped in polystyrene was studied using the time-of-flighttechnique. Mobility data were collected as a function of electric field and temperature toyield the energetic and positional disorder parameters defined in the disorder formalism.Substituted derivatives exhibit lower mobilities than regular TPD. This decrease is influencedby the change in dipole moment upon substitution of the molecule. However, the dipolardisorder contribution is found to account only partially for the large differences in mobility.
- The effect of substitution on hole mobility in N,N‘-bis-(m-tolyl)-N,N‘-diphenyl-1,1‘-biphenyl-4,4‘-diamine (TPD) derivatives doped in polystyrene was studied using the time-of-flight technique. As the ionization potential is altered by substitution, the geometric and electronic properties of the molecule are changed simultaneously. Mobility data were collected as a function of electric field and temperature. Substituted derivatives (I, II, III) exhibit lower mobilities than regular TPD.
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