Charge and exciton dynamics of OLEDs under high voltage nanosecond pulse: towards injection lasing

Ahmad, Viqar, Sobus, Jan, Greenberg, Mitchell, Shukla, Atul, Philippa, Bronson, Pivrikas, Almantas, Vamvounis, George, White, Ronald, Lo, Shih-Chun, and Namdas, Ebinazar B. (2020) Charge and exciton dynamics of OLEDs under high voltage nanosecond pulse: towards injection lasing. Nature Communications, 11. 4310.

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Abstract

Electrical pumping of organic semiconductor devices involves charge injection, transport, device on/off dynamics, exciton formation and annihilation processes. A comprehensive model analysing those entwined processes together is most helpful in determining the dominating loss pathways. In this paper, we report experimental and theoretical results of Super Yellow (Poly(p-phenylene vinylene) co-polymer) organic light emitting diodes oper- ating at high current density under high voltage nanosecond pulses. We demonstrate complete exciton and charge carrier dynamics of devices, starting from charge injection to light emission, in a time scale spanning from the sub-ns to microsecond region, and compare results with optical pumping. The experimental data is accurately replicated by simulation, which provides a robust test platform for any organic materials. The universality of our model is successfully demonstrated by its application to three other laser active materials. The findings provide a tool to narrow the search for material and device designs for injection lasing.

Item ID: 64194
Item Type: Article (Research - C1)
ISSN: 2041-1723
Copyright Information: © The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Funders: Australian Research Council (ARC), Department of Industry, Innovation and Science (DIIS)
Projects and Grants: ARC - DP160100700, DIIS - AISRF53765
Date Deposited: 01 Sep 2020 01:50
FoR Codes: 09 ENGINEERING > 0912 Materials Engineering > 091208 Organic Semiconductors @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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