Material for organic electroluminescent devices and organic electroluminescent devices made by using the same
AssigneeIdemitsu Kosan Co., Ltd.
InventorsToshihiro Iwakuma, Chishio Hosokawa, Hidetsugu Ikeda, Seiji Tomita, Takashi Arakane
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Abstract
A material for electroluminescent devices which comprises a compound in which a heterocyclic group having nitrogen is bonded to carbazolyl group and an organic electroluminescent device having at least one organic thin film layer which is sandwiched between the cathode and the anode and contains the above material in at least one layer, are provided. The material can provide organic electroluminescent devices emitting bluish light with a high purity of color. The organic electroluminescence device uses the material.
Claims12
An organic electroluminescence device, comprising:
- an anode;
- a cathode;
- and
- an organic thin film layer;
- wherein:
- the organic thin film layer is disposed between the anode and the cathode;
- the organic thin film layer comprises a phosphorescent light emitting layer;
- and
- the phosphorescent light emitting layer comprises a compound according to formula (1):
- (Cz-)nMm (1)
- wherein:
- each Cz is independently a substituted carbazolyl group or an unsubstituted carbazolyl group;
- each substituted carbazolyl group Cz independently comprises at least one substituent selected from a substituted aromatic group, an unsubstituted aromatic group, a substituted aromatic heterocyclic group, and an unsubstituted aromatic heterocyclic group;
- each M is independently a substituted pyridine, an unsubstituted pyridine, a substituted pyrimidine, an unsubstituted pyrimidine a substituted quinazoline, or an unsubstituted quinazoline;
- each substituted group M independently comprises at least one substituent selected from a substituted aromatic group, an unsubstituted aromatic group, a substituted aromatic heterocyclic group, and an unsubstituted aromatic heterocyclic group;
- n is an integer of 1 to 2;
- m is an integer of 1 to 3;
- and
- at least one group M is bonded to at least one carbazolyl group Cz at a 9-position of the at least one carbazolyl group Cz.
An organic electroluminescence device, comprising:
- an anode;
- a cathode;
- and
- an organic thin film layer;
- wherein:
- the organic thin film layer is disposed between the anode and the cathode;
- the organic thin film layer comprises a host compound according to formula (1) and a phosphorescent organometallic complex according to formula (A):
- each Cz is independently a substituted carbazolyl group or an unsubstituted carbazolyl group;
- each substituted carbazolyl group Cz independently comprises at least one substituent selected from a substituted aromatic group, an unsubstituted aromatic group, a substituted aromatic heterocyclic group, and an unsubstituted aromatic heterocyclic group;
- each M is independently a substituted pyrimidine, an unsubstituted pyrimidine, a substituted quinazoline, or an unsubstituted quinazoline;
- each substituted group M independently comprises at least one substituent selected from a substituted aromatic group, an unsubstituted aromatic group, a substituted aromatic heterocyclic group, and an unsubstituted aromatic heterocyclic group;
- n is an integer of 1 to 2;
- m is an integer of 1 to 2;
- at least one group M is bonded to at least one carbazolyl group Cz at a 9-position of the at least one carbazolyl group Cz;
- A1 represents a substituted or unsubstituted aromatic hydrocarbon cyclic group or aromatic heterocyclic group;
- A2 represents a substituted or unsubstituted aromatic heterocyclic group having nitrogen atom as the atom forming the heterocyclic ring;
- the ring having the group represented by A1 and the ring having the group represented by A2 may form one condensed ring;
- Q represents iridium;
- L represents a bidentate ligand;
- and
- m and n each represent an integer.
Dependencies are inferred from the claim text.