Electric field redistribution and electroluminescence response time in polymeric light-emitting diodes

Österbacka, R. ; Juška, G. ; Arlauskas, K. ; Pal, A. J. ; Källman, K.-M. ; Stubb, H. (1988) Electric field redistribution and electroluminescence response time in polymeric light-emitting diodes Journal of Applied Physics, 84 (6). pp. 3359-3363. ISSN 0021-8979

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Official URL: http://jap.aip.org/resource/1/japiau/v84/i6/p3359_...

Related URL: http://dx.doi.org/10.1063/1.368493

Abstract

The electric field redistribution due to injected and trapped charge carriers in Langmuir-Blodgett (LB) films of poly(3-hexylthiophene) (P3HT) sandwiched between indium tin oxide and aluminum (Al) electrodes as function of applied voltage has been studied using charge collection measurements by the time-of-flight technique. For μ tE<d (the drift distance shorter than the interelectrode distance) the amount of the collected photocharge is a function of electric field near the Al electrode and has been used to probe the time evolution of it. The response time for the field to redistribute inside the P3HT LB film was found to be of the order of 5-200 μs, in good agreement with the delay time observed in time-resolved electroluminescence measurements in light-emitting diodes (LED) of similar LB films. We suggest a model for the response times in organic LEDs based on these results.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Light Emitting Diodes; Optical Polymers; Electroluminescence; Time Resolved Spectra; Langmuir-Blodgett Films; Hole Mobility
ID Code:65662
Deposited On:17 Oct 2011 10:42
Last Modified:17 Oct 2011 10:42

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