Patent ID: 7087320

Claim:
An OLED device comprising a light-emitting layer (LEL) containing a host and an emitting dopant located between a cathode and an anode wherein the dopant is a naphthacene derivative represented by formula (II): wherein: R 5 , R 6 , R 11 and R 12 are phenyl groups; at least one of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 and R 12 is or contains a fluorine or a fluorine containing group: provided that the remaining R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 and R 12 are selected from hydrogen and substituent groups; and provided further that when exactly two fluorine containing groups are present said groups are not located at R 5 and R 12 or at R 6 and R 11 , and further provided that the substituents are selected so that naphthacene derivative has a wavelength of maximum emission (λ max ) in ethyl acetate solution such that 520 nm≦λ max ≦650 nm.