Simulating the spatiotemporal exciton dynamics in an electrically pumped organic laser Adam Bickerdike, Roderick C.I. Mackenzie, Mujeeb U. Chaudhry Durham University, UK To reliably achieve electrically pumped organic lasers, a unified understanding of the complex interactions between charge carriers and excitons during LASER operation must be developed. The interplay between the large charge carrier densities required to reach threshold, and the respective excited state populations has been demonstrated to be a major problem in realising an electrically pumped organic laser (i.e., annihilation processes and quenching). In this work, a drift-diffusion model of a high current density µOLED device, utilising the PPV copolymer PDY-132 is developed. Importantly, the model includes the effect of charge carrier trapping through Shockley-Reed-Hall recombination and implements fundamental LASER theory to describe stimulated emission process. We demonstrate that the threshold for stimulated emission in a SY µOLED can be predicted based on the incorporation of carrier trapping in the device and simulating the effects of excited state absorption. References 1. Baldo, M.A., Holmes, R.J., Forrest, S.R.: Prospects for electrically pumped organic lasers. Physical Review B - Condensed Matter and Materials Physics 66(3), 353211–3532116 (2002) 2. Sandanayaka, A.S.D., Matsushima, T., Bencheikh, F., Terakawa, S., Potscavage, W.J., Qin, C., Fujihara, T., Goushi, K., Ribierre, J.C., Adachi, C.: Indication of current-injection lasing from an organic semiconductor. Appl. Phys. Express 12 (6), 061010 (2019) 3. Ahmad, V., Sobus, J., Greenberg, M., Shukla, A., Philippa, B., Pivrikas, A., Vamvounis, G., White, R., Lo, S.C., Namdas, E.B.: Charge and exciton dynam-ics of OLEDs under high voltage nanosecond pulse: towards injection lasing. Nature Communications 2020 11:1 11(1), 1–8 (2020)
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