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Stimulated emission is observed from OLEDS at current densities as low as 20 uA/cm2, where a high Q cavity is formed between the Ag cathode and the exit surface of the substrate. Inversion is dependent on Boltzmann population of vibrational levels serving as the ground state and this results in spectral dynamics on the time scale of thermalization of the device.
Mitch Nelson
"Low onset stimulated emission in OLEDS", Proc. SPIE 12208, Organic and Hybrid Light Emitting Materials and Devices XXVI, 1220809 (3 October 2022); https://doi.org/10.1117/12.2634247
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Mitch Nelson, "Low onset stimulated emission in OLEDS," Proc. SPIE 12208, Organic and Hybrid Light Emitting Materials and Devices XXVI, 1220809 (3 October 2022); https://doi.org/10.1117/12.2634247