The Investigation on Color Purity of Blue Organic Light-Emitting Diodes (BOLED) by Hole-Blocking Layer

Figure 1

The chemical structures of (a) NPB, (b) BCP, (c) DPVBi, (d) BPhen, and (e) Alq₃ and the schematic energy band diagrams of (f) device A, (g) device B, and (h) device C.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)