IRIDIUM COMPLEX AND ORGANIC ELECTROLUMINESCENCE DEVICE USING THE SAME
The present invention discloses an iridium complex represented by the following formula (1) and an organic electroluminescence device using the iridium complex as a phosphorescent dopant material. The phosphorescent dopant material may lower a driving voltage and power consumption and increase a current efficiency and half-life of the organic electroluminescence device. The same definition as described in the present invention.
1 . An iridium complex represented by the following formula (1):
wherein C-D represents a bidentate ligand; ring A and ring B independently represent a substituted or unsubstituted aromatic ring, a substituted or unsubstituted heteroaromatic ring, or a fused ring hydrocarbon unit with two to four rings; X is O or S; m represents an integer of 1 to 3; n and p independently represent an integer of 1 to 4; and R 1 to R 2 are independently selected from the group consisting of a hydrogen atom, a halogen, NO 2 , a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms.
2 . The iridium complex according to claim 1 , wherein C-D represents one of the following formulas:
wherein Y is selected from the group consisting of O, S, Se, CR 23 R 24 , NR 25 or SiR 26 R 27 ; q, s, and t independently represent an integer of 1 to 4; and R 3 to R 27 are independently selected from the group consisting of a hydrogen atom, a halogen, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms.
3 . The iridium complex according to claim 2 , wherein R 3 to R 22 are independently selected from the group consisting of a hydrogen atom, a methyl group, an isopropyl group, an isobutyl group, a cyclopentyl group, a hexyl group, a cyclohexyl group, or a phenyl group.
4 . The iridium complex according to claim 1 , wherein ring A and ring B independently represent a phenyl group, a naphthyl group, an anthracenyl group, a phenanthrenyl group, a pyrenyl group, a triphenylenyl group, a pyridine group.
5 . The iridium complex according to claim 1 , wherein the iridium complex is selected from the group consisting of:
6 . An organic electroluminescence device comprising a pair of electrodes consisting of a cathode and an anode, and a light emitting layer between the pair of electrodes, wherein the light emitting layer comprises the iridium complex according to claim 1 .
7 . The organic electroluminescence device of claim 6 , wherein the iridium complex is used as a phosphorescent dopant material for the light emitting layer to emit a light, and wherein the dopant material is capable of lowering a driving voltage, increasing a current efficiency and extending a half-life of the organic electroluminescence device.
8 . The organic electroluminescence device of claim 6 , wherein the light comprises a red, green, blue, or yellow light.
9 . The organic electroluminescence device of claim 6 , wherein the organic electroluminescence device is a lighting panel.
10 . The organic electroluminescence device of claim 6 , wherein the organic electroluminescence device is a backlight panel.
11 . The organic electroluminescence device of claim 8 , wherein the red light is emitted for a half-life longer than about 710 hours, at a current efficiency greater than about 19 cd/A, upon application of a driving voltage lower than about 4.4 V.
12 . The organic electroluminescence device of claim 8 , wherein the green light is emitted for a half-life longer than about 670 hours, at a current efficiency greater than about 45 cd/A, upon application of a driving voltage lower than about 4.2 V.
13 . The organic electroluminescence device of claim 8 , wherein the blue light is emitted for a half-life longer than about 490 hours, at a current efficiency greater than about 35 cd/A, upon application of a driving voltage lower than about 4.5 V.
14 . The organic electroluminescence device of claim 8 , wherein the yellow light is emitted for a half-life longer than about 440 hours, at a current efficiency greater than about 39 cd/A, upon application of a driving voltage lower than about 4.8 V.
15 . The organic electroluminescence device of claim 8 , wherein a red light is emitted, and wherein the dopant material is capable of lowering the driving voltage to about 3.9 V, increasing the current efficiency to about 24 cd/A, and extending the half-life to about 810 hours.
16 . The organic electroluminescence device of claim 8 , wherein a blue light is emitted, and wherein the dopant material is capable of lowering the driving voltage to about 4.1 V, increasing the current efficiency to about 40 cd/A, and extending the half-life to about 570 hours.
17 . The organic electroluminescence device of claim 8 , wherein a yellow light is emitted, and wherein the dopant material is capable of lowering the driving voltage to about 4.3 V, increasing the current efficiency to about 46 cd/A, and extending the half-life to about 540 hours.
18 . The organic electroluminescence device of claim 15 , wherein the iridium complex is represented by
19 . The organic electroluminescence device of claim 16 , wherein the iridium complex is represented by
20 . The organic electroluminescence device of claim 17 , wherein the iridium complex is represented by