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

Angeles Pitarch; Germà Garcia-Belmonte; Juan Bisquert

doi:10.1117/12.584642

10 November 2004 Impedance model of two-carrier space-charge limited current in organic light-emitting diodes

Angeles Pitarch, Germà Garcia-Belmonte, Juan Bisquert

Proceedings Volume 5519, Organic Light-Emitting Materials and Devices VIII; (2004) https://doi.org/10.1117/12.584642
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

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/C_g=0.75 (being C_g 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.

Citation Download 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, (10 November 2004); https://doi.org/10.1117/12.584642

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