Organometallic materials and electroluminescent devices
View Patent ↗An electroluminescent device comprises a light-emitting layer containing a light emitting material that contains an organometallic complex having a partial structure represented by the following formula (I): wherein, M represents a metal selected from group 8, 9, or 10 metals; and one X is a carbon that forms a covalent bond with M and the other two X is are heteroatoms, one of which forms a coordinative bond with M and the other of which forms a covalent bond with M; wherein all of the Xs are linked together to form a dianionic tridentate cyclometallating ligand to form a five or six-membered metallocycle with M where each X can be a part of a separate cyclic or acyclic structure.
1. An electroluminescent device comprising a light-emitting layer containing a light emitting material that contains an organometallic complex is represented by formula (II)
wherein,
M represents a metal selected from group 10 metals;
C represents a carbon atom;
X represents a heteroatom selected from N or O in which one X forms a covalent bond with the metal and the other X forms a coordinative bond with the metal; and
L 1 represents a phosphine ligand that coordinates to the metal through a coordinative bond.
2. The organometallic complex of claim 1 wherein the ligand L 1 is selected from the following compounds:
3. An electroluminescence device comprising a light-emitting layer containing a light emitting material that contains an organometallic complex wherein the organometallic complex is represented by the following formula (IX):
wherein
R 1 -R 9 represent hydrogen or independently selected substituent groups, provided that R 1 and R 2 , R 2 and R 3 , R 3 and R 4 , R 4 and R 5 , R 5 and R 6 , R 6 and R 7 , R 7 and R 8 , as well as R 8 and R 9 may combine to form a ring group; and
L 1 represents a ligand that coordinates to the Pt through a coordinative bond.
4. The electroluminescence device of claim 3 wherein the organometallic complex is represented by the formula (X):
wherein,
R 11 -R 17 represent hydrogen or independently selected substituent groups, provided that adjacent two groups may combine to form a ring group, as well as R 14 and R 15 may combine to form a ring group; and
L 1 represents a ligand that coordinates to the Pt through a coordinative bond.
5. The device of claim 4 wherein L 1 is selected from triarylphosphines represented by Ar 3 P wherein each Ar independently represents a substituent selected from aromatic groups or heteroaromatic groups.
6. The electroluminescent device of claim 1 wherein the organometallic complex is a dopant compound dispersed in a host material.
7. The electroluminescent device of claim 6 wherein the dopant compound is present in an amount of up to 15% wt % based on the host.
8. The electroluminescent device of claim 1 that emits white light.