Fig. 8
(Reproduced with permission from Ref. [25] Copyright © 2007, American Chemical Society)
a Structures of polymers. b Energy level diagram of the WPLEDs [in BEL-PVK: solid line, poly-TPD: dashed line, and BE-co-MEH-PPV: dotted line; in TEL-PFO: solid line and PFT: dashed line]