Fig. 2: Device performance of TADF devices A–C.

a EL spectra; b EQE versus luminance curves; c current density-voltage-luminance curves, and d device stability (at an initial luminance of 1000 cd m−2).
a EL spectra; b EQE versus luminance curves; c current density-voltage-luminance curves, and d device stability (at an initial luminance of 1000 cd m−2).