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 spectra of devices H and I. (b) Normalized EL spectra of the devices J and K, and the PL spectrum of neat Alq3 in a solid-state film. The insets in panels (a) and (b) show the schematic energy level diagrams of devices H and J respectively.