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Exciton and Charge Carrier Transport in Random Organic Solids

  • Chapter
Disorder Effects on Relaxational Processes

Abstract

The phenomenon of relaxation reflects the tendency of a system to approach equilibrium after some perturbation. In the case of an electronic excitation of a bulk system it will, in general, involve (1) the instantaneous readjustment of the local electron distribution, (2) the dissipation of excess energy (electronic or vibrational), (3) the structural response of the system on the change of the electron distribution, (4) energy loss processes occurring in the course of electronic transport towards lower lying electronic states, and (5) electronic decay followed by structural relaxation towards the equilibrium state. This chapter focusses on process (4), i.e. the electronic relaxation of an ensemble of neutral or charged excitations while executing a random walk among the constituent elements of a disordered molecular solid and its manifestation in photoluminescence and transient photoconductivity. After outlining the conceptional framework experimental results will be presented illustrating the main features of electronic relaxation as revealed by energy and time resolved luminescence spectroscopy. Finally the question will be addressed how this framework can be adapted to account for time dependent charge transport in random organic photoconductors.

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Abbreviations

BP:

benzophenone

CTRW:

continuous time random walk

DEH:

p-diethylaminobenzaldehyde diphenyl hydrazone

DOS:

density of states

EMA :

effective medium approximation

MTHF:

methyltetrahydrofuran

ODOS:

occupational density of states

PC:

polycarbonate

PPPV:

poly-(phenylphenylenevinylene)

PPV:

poly-(phenylenevinylene)

S :

Huang-Rhys factor

SSF:

site-selective fluorescence

TAPC:

1,1-bis (di-4-tolylaminophenyl) cy clohexane

TOF:

time of flight

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Authors
  1. H. Bässler
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Editor information

Editors and Affiliations

  1. Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128, Mainz, Germany

    Ranko Richert

  2. Theoretische Polymerphysik Albert-Ludwigs-Universität, Rheinstr 12, 79104, Freiburg, Germany

    Alexander Blumen

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© 1994 Springer-Verlag Berlin Heidelberg

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Bässler, H. (1994). Exciton and Charge Carrier Transport in Random Organic Solids. In: Richert, R., Blumen, A. (eds) Disorder Effects on Relaxational Processes. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-78576-4_18

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  • DOI: https://doi.org/10.1007/978-3-642-78576-4_18

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-78578-8

  • Online ISBN: 978-3-642-78576-4

  • eBook Packages: Springer Book Archive

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