Fig. 1
From: Long-lived efficient delayed fluorescence organic light-emitting diodes using n-type hosts
Molecular structures and properties. a Distribution of HOMO, LUMO and TSDD in SF3-TRZ. Optimized structures of the HOMO, LUMO, and TSDD of SF3-TRZ were calculated by TD-DFT (Gaussian09/B3LYP/6–31 G + (d)). b Absorption and photoluminescence spectra (298 K) of spirobifluorene (SF), triazine (TRZ), SF2-TRZ, SF3-TRZ and SF4-TRZ in dilute toluene solution. c Phosphorescent spectra of SF2-TRZ, SF3-TRZ, and SF4-TRZ in 2-methyltetrahydrofuran glass at 77 K. d Hole and electron transport in an SF2-TRZ neat film. Hole and electron current density (J) versus applied voltage (V) in an SF2-TRZ neat film. e Hole and electron transport in an SF4-TRZ neat film. Hole and electron J against V in an SF4-TRZ neat film
