Thermal Activation Bottleneck in TADF OLEDs based on m-MTDATA:BPhen

Long-lived spin-polarized intermolecular exciplex states in thermally activated delayed fluorescence-based organic light-emitting diodes

“…The homogeneous linewidth FWHM h = 22 MHz allows to estimate a lower limit for the dephasing time T 2 * > 2/( • FWHM h ) = 30 ns, while the width of the spike corresponds to the spin-lattice relaxation time. The dephasing time agrees well with that estimated from pulsed Rabi experiments on similar OLED systems (55,61).…”