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.
Keywords
- Electronic Relaxation
- Continuous Time Random Walk
- Charge Carrier Transport
- Effective Medium Approximation
- Occupational Density
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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
References
Mott NF, Davies EA (1971) Electronic processes in non-crystalline materials, Clarendon, Oxford
Bässler H (1981) Phys stat sol (b) 107:9
Jankowiak R, Rockwitz KD, Bässler H (1985) J Phys Chem 89:4569
Elschner A, Bässler H (1987) Chem Phys 112:285
see, e.g. Pope M, Swenberg CE (1982) Electronic process in organic crystals (Clarendon Press, Oxford)
Movaghar B, Grünewald M, Pohlmann B, Würtz D, Schirmacher W (1987) J Stat Phys 30:315
Miller A, Abrahams E (1960) Phys Rev 120:745
Scher H, Lax M (1973) Phys Rev B 10:4491, 4502
Scher H, Montroll EW (1975) Phys Rev B 12:2455
Klafter J, Silbey R (1980) Phys Rev Lett 44:55
Movaghar B (1980) J Phys C 13:4915
Movaghar B, Schirmacher W (1981) J Phys C 14:589
Grünewald M, Pohlmann B, Movaghar B, Würtz D (1984) Phil Mag B 49:341
Movaghar B, Grünewald M, Ries B, Bässler H, Würtz D (1986) Phys Rev B 33:5545
Schönherr G, Bässler H, Silver M (1981) Phil Mag B 44:47
Bässler H (1993) Phys stat sol (b) 175:15
Ferry JD, Gromdine LD, Fitzgerald ER (1953) J Appl Phys 24:912
Movaghar B, Ries B, Grünewald M (1986) Phys Rev B 34:5574
Bässler H In: Bässler H (ed) (1989) Optical techniques to characterize polymer systems. Elsevier, Amsterdam
Rudenko AI, Bässler H (1991) Chem Phys Lett 182:581
Arkhipov VI, Bässler H, Rudenko AI (1991) J Non-Cryst Solids 137&138:503
Hunter TF, McAlpine RD, Hochstrasser RM (1969) J Chem Phys 50:1140
Richert R, Bässler H, Ries B, Movaghar B, Grünewald M (1989) Phil Mag Lett 59:95
Lange J, Ries B, Bässler H (1988) Chem Phys 128:47
Richert R, Bässler H (1986) J Chem Phys 84:3567
Heeger AJ, Kivelson S, Schrieffer RJ, Su WP (1988) Rev Mod Phys 60:782
Bloor D, Ando DJ, Preston FH, Stevens GC (1974) Chem Phys Lett 24:407
Lochner K, Bässler H, Tieke B, Wegner G (1978) Phys stat sol (b) 88:653
Sebastian L, Weiser G (1981) Chem Phys 62:447
Feast JW, Millichamp IS, Friend RH, Morton ME, Phillips D, Rughooputh SDDV, Rumbles G (1985) Synth Met 10:181
Colaneri NF, Bradley DDC, Friend RH, Burn PL, Holmes AB, Spangler CW (1990) Phys Rev B 42:11670
Heun S, Mahrt RF, Greiner A, Lemmer U, Bässler H, Halliday DA, Bradley DDC, Burn PL, Holmes AB (1993) J Phys Condens Matter 5:247
Mahrt RF, Bässler H (1991) Synth Met 45:107
Personov RI (1983) In: Agranowich VM, Hochstrasser RM (eds) Spectroscopy and excitation dynamics of condensed molecular systems. North Holland, Amsterdam, p 555
Elschner A, Mahrt RF Pautmeier L, Bässler H, Stolka M, McGrane K, (1991) Chem Phys 150:81
Rauscher U, Bässler H, Bradley DDC, Hennecke M, (1990) Phys Rev B 42:9830
Lemmer U, Mahrt RF, Wada Y, Bässler H, Göbel EO (1993) Chem Phys Lett 209:243
Lemmer U, Mahrt RF, Wada Y, Greiner A, Bässler H, Göbel EO (1993) Appi Phys Lett 62:2827
Berlman IB (1971) Handbook of fluorescence spectra of aromatic molecules, 2nd Ed., New York
Mukamel S, Wang HX (1992) Phys Rev Lett. 69:65
Abe S, Schreiber M, Su WP, Yu J (1992) Phys Rev B 45:9432
Horvath A, Bässler H, Weiser G (1992) Phys stat sol (b) 173:755
for a recent discussion of polaron effects in this context see Schein LB (1992) Phil Mag B 65:193
Yuh HJ, Pai DM (1990) Phil Mag Lett 62:61
Yuh HJ, Stolka M (1988) Phil Mag B 58:539
Borsenberger PM (1990) J Appi Phys 68:6263
Abkowitz M, Bässler H, Stolka M (1991) Phil Mag B 63:201
Borsenberger PM, Pautmeier L, Bässler H (1991) J Chem Phys 94:5447
Borsenberger PM, Bässler H (1991) J Chem Phys 95:5327
Kitamura T, Yokoyama M (1991) J Appi Phys 69:821
Kanemitsu Y, Funada H, Masumoto Y (1992) J Appi Phys 71:300
50.Borsenberger PM, J Phys Chem (in press)
Sugiuchi M, Nishizawa H, Uehara T (1990) In: Nash RJ (ed) Proc. 6th Intl. congress on advances in non-impact printing technologies. Society for imaging science and technology, Springfield, VA, p 298
Dieckmann A, Bässler H, Borsenberger PM (1993) J Chem Phys 99:8136
Richert R, Wagener A (1993) J Phys Chem 97:3146
Borsenberger PM, Pautmeier L, Bässler H (1992–1) Phys Rev B 46:12145
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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
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