Share Email Print

Proceedings Paper

Impedance model of two-carrier space-charge limited current in organic light-emitting diodes
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Impedance model of one-carrier space-charge limited current (SCLC) has often been applied to explain some experimental features in organic light-emitting diodes (OLED). However double injection current occurs in working devices and the impedance model has not been studied so far. We analyze the problem of double injection SCL current in the limit of infinite recombination. In order to obtain the ac response of a biased OLED we solve the equations for time dependent double-injection of space-charge-limited currents. We give an analytical expression for impedance as a function of frequency. Calculations predict values for the static capacitance C(ω→0) similar to those encountered in case of one-carrier SCLC, in which C/Cg=0.75 (being Cg the geometric capacitance), but shifted to higher frequencies. We give the equivalent circuits representing the limits at low frequencies. This model will help to understand the behavior of two carrier devices.

Paper Details

Date Published: 10 November 2004
PDF: 9 pages
Proc. SPIE 5519, Organic Light-Emitting Materials and Devices VIII, (10 November 2004); doi: 10.1117/12.584642
Show Author Affiliations
Angeles Pitarch, Univ. Jaume I (Spain)
Germà Garcia-Belmonte, Univ. Jaume I (Spain)
Juan Bisquert, Univ. Jaume I (Spain)

Published in SPIE Proceedings Vol. 5519:
Organic Light-Emitting Materials and Devices VIII
Zakya H. Kafafi; Paul A. Lane, Editor(s)

© SPIE. Terms of Use
Back to Top