As bathocuproine has a good hole-blocking ability, the recombination area is in the NPB layer. When the thickness of bathocuproine is 8 nm, the blue OLED has color coordinate in CIE chromaticity (0.16, 0.17) and a brightness of 4989 cd/m2.

• 这种器件中的BCP层的厚度按0nm、2nm、4nm、6nm、8nm