Exciplex formation and electroluminescent absorption in ultraviolet organic light-emitting diodes*
Zhang Qia), Zhang Haoa), Zhang Xiao-Wenb)†, Xu Taoa), Wei Bina)‡
       
(a) Normalized EL spectrum of device C and the PL spectrum of neat TAZ in a solid-state film. (b) Normalized EL spectrum of device D and the PL spectrum of neat PBD in a solid-state film. The insets in panels (a) and (b) show the schematic energy level diagrams of devices C and D, respectively.