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Proceedings Article

Impedance model of two-carrier space-charge limited current in organic light-emitting diodes

[+] Author Affiliations
Angeles Pitarch, Germà Garcia-Belmonte, Juan Bisquert

Univ. Jaume I (Spain)

Proc. SPIE 5519, Organic Light-Emitting Materials and Devices VIII, 304 (November 10, 2004); doi:10.1117/12.584642
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From Conference Volume 5519

  • Organic Light-Emitting Materials and Devices VIII
  • Zakya H. Kafafi; Paul A. Lane
  • Denver, CO | August 02, 2004

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.

© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Angeles Pitarch ; Germà Garcia-Belmonte and Juan Bisquert
"Impedance model of two-carrier space-charge limited current in organic light-emitting diodes", Proc. SPIE 5519, Organic Light-Emitting Materials and Devices VIII, 304 (November 10, 2004); doi:10.1117/12.584642; http://dx.doi.org/10.1117/12.584642


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