Organometallic compound and organic electroluminescent device including the same
Disclosed is an organometallic compound represented by a following Chemical Formula I, wherein the compound is a metal complex including a central coordination metal and a main ligand binding thereto, wherein the main ligand has a structure in which a fused ring is further introduced into 2-phenylquinoline. When the organometallic compound is used as dopant of a light-emitting layer of an organic electroluminescent device, rigidity is imparted to the organometallic compound molecule such that a full width at half maximum (FWHM) is narrow and thus color purity is improved. Further, a non-luminescent recombination process is reduced such that luminous efficiency and lifespan of the organic electroluminescent device are improved. Chemical Formula I is shown below:
1 . An organometallic compound represented by one of the following compounds:
2 . The organometallic compound of claim 1 , wherein the compound is used as a red phosphorescent material or a green phosphorescent material.
3 . An organic electroluminescent device comprising:
a first electrode;
a second electrode facing the first electrode; and
an organic layer disposed between the first electrode and the second electrode,
wherein the organic layer includes a light-emitting layer, and
wherein the light-emitting layer contains the organometallic compound according to claim 1 .
4 . The organic electroluminescent device of claim 3 , wherein the organometallic compound is used as dopant of the light-emitting layer.
5 . The organic electroluminescent device of claim 3 , wherein the organic layer further includes at least one selected from a group consisting of a hole injection layer, a hole transport layer, an electron transport layer and an electron injection layer.
6 . An organic light-emitting display device comprising:
a substrate;
a driving element positioned on the substrate; and
an organic light-emitting element disposed on the substrate and connected to the driving element,
wherein the organic light-emitting element includes the organic electroluminescent device according to claim 3 .
7 . The organic electroluminescent device of claim 3 , wherein the organic layer is formed by sequentially stacking a hole injection layer, a hole transport layer, a light emission layer, an electron transport layer and an electron injection layer on the first electrode.
8 . The organic electroluminescent device of claim 7 , wherein the hole injection layer comprises a compound selected from a group consisting of MTDATA, CuPc, TCTA, NPB(NPD), HATCN, TDAPB, PEDOT/PSS, N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine, and NPNPB (N,N′-diphenyl-N,N′-di[4-(N,N-diphenyl-amino)phenyl]benzidine).
9 . The organic electroluminescent device of claim 7 , wherein the hole transport layer comprises a compound selected from a group consisting of TPD, NPD, CBP, N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine, and N-(biphenyl-4-yl)-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)biphenyl)-4-amine.
10 . The organic electroluminescent device of claim 4 , wherein the light-emitting layer includes a host and the organometallic compound as dopant, and wherein the host material is selected from a group consisting of CBP (carbazole biphenyl), and mCP (1,3-bis(carbazol-9-yl).
11 . The organic electroluminescent device of claim 5 , wherein the electron transport layer and the electron injection layer are sequentially stacked between the light-emitting layer and the second electrode.
12 . The organic electroluminescent device of claim 5 , wherein the electron transport layer comprises a compound selected from a group consisting of Alq3 (tris(8-hydroxyquinolino)aluminum), Liq (8-hydroxyquinolinolatolithium), PBD (2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4oxadiazole), TAZ (3-(4-biphenyl)4-phenyl-5-tert-butylphenyl-1,2,4-triazole), spiro-PBD, BAlq (bis(2-methyl-8-quinolinolate)-4-(phenylphenolato)aluminium), SAlq, TPBi (2,2′,2-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole), oxadiazole, triazole, phenanthroline, benzoxazole, benzthiazole, and ZADN (2-[4-(9,10-Di-naphthalen-2-yl-anthracen-2-yl)-phenyl]-1-phenyl-1H-benzoimidazole).
13 . The organic electroluminescent device of claim 5 , wherein the electron injection layer comprises a compound selected from a group consisting of Alq3 (tris(8-hydroxyquinolino)aluminum), PBD, TAZ, spiro-PBD, BAlq, and SAlq.
14 . The organic electroluminescent device of claim 5 , wherein the electron injection layer comprises a metal compound selected from the group consisting of Liq, LiF, NaF, KF, RbF, CsF, FrF, BeF 2 , MgF 2 , CaF 2 , SrF 2 , BaF 2 and RaF 2 .
15 . The organic electroluminescent device of claim 5 , wherein the organic electroluminescent device has a tandem structure comprising two light-emitting stacks.
16 . The organic electroluminescent device of claim 5 , wherein the organic electroluminescent device has a tandem structure comprising three light-emitting stacks.