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Transient Electroluminescence from PPV under Strong Voltage Pulses

Published online by Cambridge University Press:  10 February 2011

V. Savvate'ev
Affiliation:
Racah Institute of Physics, The Hebrew University of Jerusalem, ISRAEL 91904
R. Pogreb
Affiliation:
Research Institute, College of Judea and Samaria, Ariel, ISRAEL 44837
D. Davidov
Affiliation:
Racah Institute of Physics, The Hebrew University of Jerusalem, ISRAEL 91904
H. Chayet
Affiliation:
Racah Institute of Physics, The Hebrew University of Jerusalem, ISRAEL 91904
R. Neumann
Affiliation:
Casali Institute of Applied Chemistry, The Hebrew University of Jerusalem, ISRAEL 91904
Y. Avny
Affiliation:
Department of Organic Chemistry, The Hebrew University of Jerusalem, ISRAEL 91904
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Abstract

We have studied the transient electroluminescence (EL) from poly(phenylenevinylene), PPV, as a function of electric field under strong electric pulses up to fields of E≈ 109 V/m with emphasis on (a) the time delay, τ, between the electric pulse and the onset of the EL emission pulse and (b) the EL intensity as a function of the field. A monotonic decrease of τ with increasing E is explained by an increase of the carriers mobility according to Frenkel- Poole model. The EL intensity at high fields is proportional to E3 suggesting that the contacts at the polymer-metal electrode interfaces are practically ohmic. We demonstrate significantly improved brightness, peak power and lifetimes for polymer-based light emitting diodes working under such a pulsed mode.

Type
Research Article
Copyright
Copyright © Materials Research Society 1998

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Transient Electroluminescence from PPV under Strong Voltage Pulses
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