Efficient deep blue emitters for organic electroluminescent devices

Highly efficient deep blue organic light emitting devices have been fabricated with a 4-(styryl)biphenyl-core based fluorescent dopant (SK-1) in the wide band gap 2-methyl-9,10-di(1-naphthyl)anthracene (α,α-MADN) host system which achieved an electroluminescence efficiency of 5.0cd∕A and an external quantum efficiency of 4.2% at 20mA∕cm2 with a saturated blue Commission Internationale de l’Eclairage coordinates of (0.15, 0.14) and a half-decay lifetime of 8000h at an initial brightness of 100cd∕m2. The current efficiency and electroluminescent color of SK-1 doped devices have been shown to be essentially immune to drive current density.