Analysis of Optical and Electrical Responses of [Formula Omitted]-OLED With Metallized ITO Coplanar Waveguide Electrodes Submitted to Nanosecond Electrical Pulses

• Published in: IEEE transactions on electron devices Vol. 66; no. 5; p. 2282
• Main Authors: Chime, A C, Fischer, A P A, Bensmida, S, Solard, J, Chakaroun, M, Nkwawo, H
• Format: Journal Article
• Language: English
• Published: New York The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 01-01-2019
• Subjects: Coplanar waveguides; Diodes; Electrodes; Electroluminescence; Metallizing; Organic light emitting diodes; Organic materials; Pulse duration; Thin films
• ISSN: 0018-9383; 1557-9646
• DOI: 10.1109/TED.2019.2905839

In this paper, the optical and electrical pulse responses of an optimized high-speed organic light-emitting diode (OLED) is investigated as a function of the pulse duration. The original design is based on the coplanar waveguide electrodes that are implemented on a transparent and conductive oxide thin film. The designed electrodes with reduced serial resistances (13 [Formula Omitted]) allow to maximize the pulse energy delivery and to feed the organic device with short electrical pulses of few nanoseconds for the first time. This is achieved by designing the electrodes to have 50-[Formula Omitted] characteristic impedance, thanks to microwave techniques, and by implementing small values of capacitance (4.5 pF). The experimental results demonstrate [Formula Omitted]-OLED electrical and optical responses to electrical excitation pulses as short as 2.5 ns, for the first time, and state-of-the-art current densities above 1.7 kA/cm2. Moreover, and rather unexpectedly, the developed characterization procedure to extract the reported results demonstrated the first direct measurement of the electroluminescence lifetime of organic materials in the nanosecond time scale.