Charge and exciton dynamics of OLEDs under high voltage nanosecond pulse: towards injection lasing
Journal Publication ResearchOnline@JCUAbstract
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.
Journal
Nature Communications
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Volume
11
ISBN/ISSN
2041-1723
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Pages Count
8
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Publisher
Nature Publishing Group
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DOI
10.1038/s41467-020-18094-4