Highly efficient blue organic light-emitting diodes using quantum well-like multiple emissive layer structure

Table 1 Layer structures of OLED devices A, B, C, and D

	Structure
Device A	ITO (1,800 Ǻ)/NPB (700 Ǻ)/DPVBi (300 Ǻ)/Bphen (300 Ǻ)/Liq (20 Ǻ)/Al (1,200 Ǻ)
Device B	ITO (1,800 Ǻ)/NPB (700 Ǻ)/ADN (300 Ǻ)/Bphen (300 Ǻ)/Liq (20 Ǻ)/Al (1,200 Å)
Device C	ITO (1,800 Ǻ)/NPB (700 Ǻ)/DPASN (300 Ǻ)/Bphen (300 Ǻ)/Liq (20 Ǻ)/Al (1,200 Ǻ)
Device D	ITO (1,800 Ǻ)/NPB (700 Ǻ)/BAlq (300 Ǻ)/Bphen (300 Ǻ)/Liq (20 Ǻ)/Al (1,200 Ǻ)
Device E	ITO (1,800 Ǻ)/NPB (700 Ǻ)/DPVBi (100 Ǻ)/BAlq (100 Ǻ)/DPVBi (100 Ǻ)/Bphen (300 Ǻ)/Liq (20 Ǻ)/Al (1,200 Ǻ)
Device F	ITO (1,800 Ǻ)/NPB (700 Ǻ)/ADN (100 Ǻ)/BAlq (100 Ǻ)/ADN (100 Ǻ)/Bphen (300 Ǻ)/Liq (20 Ǻ)/Al (1,200 Ǻ)
Device G	ITO (1,800 Ǻ)/NPB (700 Ǻ)/DPASN (100 Ǻ)/BAlq (100 Ǻ)/DPASN (100 Ǻ)/Bphen (300 Ǻ)/Liq (20 Ǻ)/Al (1,200 Ǻ)