Patent ID: 8557398

Claim:
An organic light emitting device comprising: a first electrode; a second electrode; an emissive layer disposed between the first electrode and the second electrode; a first hole injection layer disposed between the first electrode and the emissive layer; a second hole injection layer disposed between the first hole injection layer and the emissive layer, comprising a second hole injecting material; and a first electron transport layer disposed between the emissive layer and the second electrode, the first hole injection layer comprising a hole injecting material and a first compound comprising an element selected from the group consisting of Mo, Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, ytterbium and B and an element selected from the group consisting of O, F, S, Cl, Se, Br, and I, the second hole injecting material being at least one selected from the group consisting of copper phthalocyanine, 1,3,5-tricarbazolylbenzene, 4,4′-biscarbazolylbiphenyl, polyvinylcarbazole, m-biscarbazolylphenyl, 4,4′-biscarbazolyl-2,2′-dimethylbiphenyl, 4,4′,4″-tri(Ncarbazolyl) triphenylamine (TCTA), 4,4′,4″-tris(3-methylphenylamino)triphenylamine (m-MTDATA), 1,3,5-tri (2-carbazolylphenyl) benzene, 1,3,5-tris(2-carbazolyl-5 methoxyphenyl)benzene, bis(4-carbazolylphenyl)silane, N,N′-bis(3-methylphenyl)-N,N′diphenyl-[1, 1-biphenyl]-4,4′-diamine (TPD), N,N′-di(naphthalene-1-yl)-N,N′-diphenyl benzidine (α-NPD), N,N′-diphenyl-N,N′-bis(1-naphthyl)-(1, 1′-biphenyl)-4,4′-diamine (NPB), poly(9,9-dioctylfluorene-co-N-(4-butylphenyl)diphenylamine) (TFB), and poly(9,9-dioctylfluorene-co-bis-N, N-phenyl-1,4-phenylenediamine (PFB), a thickness ratio of the first hole injection layer to the second hole injection layer being in a range of 1:99 to 1:9, and the first electron transport layer comprising a first electron transporting material and a second compound, the second compound represented by Formula 1 below: X a Y b <Formula 1> wherein: X is an alkali metal, an alkali earth metal, or a transition metal, Y is a group 7 element, or acetoacetate, a is a number in the range of 1 to 3, and b is a number in the range of 1 to 3, an amount of the second compound in the first electron transport layer being in a range of 30 to 50 parts by weight based on 100 parts by weight of the first electron transporting material.