Fig. 8From: White light emitting diode based on purely organic fluorescent to modern thermally activated delayed fluorescence (TADF) and perovskite materials(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]Back to article page