The transient EL responses of the device driven by various rectangular pulse voltages (repetition: 1 kHz; width: 4 μs) with the magnetic field (150 mT) being on (red line) and off (black line). The inserts (a) and (b) show the enlargement of the EL curves at the pulse-duration period when the driving voltages are 7 V and 15 V, respectively. The insert (c) is a scheme of the structure of the device.
The time-resolved MELs (calculated by MEL = [EL(t,B) − EL(t,0)]/EL(t,0)) of the device driven by various rectangular pulse (6 V, 10 V, and 15 V).
Schematic diagram for carriers and excitons kinetics.
The simulation results of the triplet (a) and singlet (b) density as a function of time with the magnetic field being on (red line) and off (black line) for the driving voltage of 15 V, all the values of the parameters used in the simulation are shown at the same time. (c) The experimental data of the EL response driven by a voltage of 15 V with the magnetic field of 150 mT on (red line) and off (black line).
The simulated time-resolved MELs (red line) and the experimental data (black line) at the pulse-duration period for various driving voltages (6 V, 10 V, and 15 V). The onset time of the EL (t EL_onset) and the corresponding current densities in the device at each voltage are shown in each part of the figure.
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