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

Viqar Ahmad, Jan Sobus (), Mitchell Greenberg, Atul Shukla, Bronson Philippa, Almantas Pivrikas, George Vamvounis, Ronald White, Shih-Chun Lo () and Ebinazar B. Namdas ()
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Viqar Ahmad: The University of Queensland
Jan Sobus: The University of Queensland
Mitchell Greenberg: James Cook University
Atul Shukla: The University of Queensland
Bronson Philippa: James Cook University
Almantas Pivrikas: Murdoch University
George Vamvounis: James Cook University
Ronald White: James Cook University
Shih-Chun Lo: The University of Queensland
Ebinazar B. Namdas: The University of Queensland

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: 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 operating 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.

Date: 2020
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DOI: 10.1038/s41467-020-18094-4

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