Organic electroluminescence element
AssigneeKonica Minolta, Inc.
InventorsSatoru Inoue, Hiroto Ito
Life of this patent
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Abstract
An organic electroluminescent element includes a light-emitting layer between an anode and a cathode. The light-emitting layer contains a phosphorescent light-emitting organic metal complex and at least one host compound. The difference in relative dielectric constant between the host compound and the phosphorescent light-emitting organic metal complex is 0 to −0.5, and the difference in dipole moment between the host compound and the phosphorescent light-emitting organic metal complex is 0 to −5.5 debye.
Claims19
An organic electroluminescent element comprising a light-emitting layer between an anode and a cathode, wherein
- the light-emitting layer comprises a phosphorescent light-emitting organic metal complex and at least one host compound;
- the host compound and the phosphorescent light-emitting organic metal complex have a difference of 0 to −0.5 in relative dielectric constant and have a difference of 0 to −5.5 debye in dipole moment;
- and
- the phosphorescent light-emitting organic metal complex is coordinated with a ligand having a partial structure represented by a general formula (1):
- where R1 represents a hydrogen atom, a halogen atom, a cyano group, or an optionally substituted alkyl, alkenyl, alkynyl, alkoxy, amino, silyl, arylalkyl, aryl, heteroaryl, alicyclic, or heteroalicyclic group;
- ring A represents a 5- or 6-membered aromatic hydrocarbon ring or aromatic heterocycle;
- Ra and Rb each independently represent a hydrogen atom, a halogen atom, a cyano group, or an optionally substituted alkyl, alkenyl, alkynyl, alkoxy, amino, silyl, arylalkyl, aryl, heteroaryl, alicyclic, or heteroalicyclic group;
- na represents 1 or 2;
- and
- nb represents an integer of 1 to 4.
An organic electroluminescent element comprising a light-emitting layer between an anode and a cathode, wherein
- the light-emitting layer comprises a phosphorescent light-emitting organic metal complex and at least one host compound;
- the host compound and the phosphorescent light-emitting organic metal complex have a difference of 0 to −0.5 in relative dielectric constant and have a difference of 0 to −5.5 debye in dipole moment;
- and
- the host compound has a partial structure represented by a general formula (4):
- Where A represents an O or S atom or an NR1 group;
- A11 to A18 each independently represent a N atom or CR2;
- and
- R1 and R2 each independently represent a bonding hand, a hydrogen atom, or a substituent;
- and if there are a plurality of CR2, they may be the same or different.
Dependencies are inferred from the claim text.