Light Emitting Device and Electronic Appliance Using the Same

A light emitting device comprising:

• a light emitting layer between a first electrode and a second electrode;
• a hole transporting layer between the first electrode and the light emitting layer;
• an electron transporting layer between the second electrode and the light emitting layer;
• and
• a mixed layer comprising an electron transporting material and an electron donating material between the electron transporting layer and the second electrode,
• wherein the light emitting layer comprises a host material and an organometallic complex, the organometallic complex comprising:
• an iridium metal;
• a ligand comprising:
• a first cyclic compound comprising a first nitrogen, a second nitrogen, a first carbon, a second carbon, a third carbon, a fourth carbon;
• wherein the first nitrogen binds with the first carbon and the fourth carbon, the second nitrogen binds with the second carbon and the third carbon, the first carbon binds with the second carbon, the third carbon binds with the fourth carbon, the first cyclic compound includes a plurality of double bindings;
• a second cyclic compound comprising a first carbon, a second carbon, a third carbon, a fourth carbon, a fifth carbon and a sixth carbon;
• wherein the first carbon binds with the second carbon and the sixth carbon, the fourth carbon binds with the third carbon and the fifth carbon, the second carbon binds with the third carbon, the fifth carbon binds with the sixth carbon, the second cyclic compound includes a plurality of double bindings;
• a third cyclic compound comprising a first carbon, a second carbon, a third carbon, a fourth carbon, a fifth carbon and a sixth carbon;
• wherein the first carbon binds with the second carbon and the sixth carbon, the fourth carbon binds with the third carbon and the fifth carbon, the second carbon binds with the third carbon, the fifth carbon binds with the sixth carbon, the third cyclic compound includes a plurality of double bindings;
• R1 representing an electron-drawing group;
• R2 representing an electron-drawing group;
• R3 representing any one of a hydrogen or a carbon;
• and
• R4 representing any one of a hydrogen or a carbon atom;
• wherein the first carbon of the first cyclic compound binds with the first carbon of the second cyclic compound,
• wherein the second carbon of the first cyclic compound binds with the first carbon of the second cyclic compound,
• wherein the R1 binds with the fourth carbon of the second cyclic compound,
• wherein the R2 binds with the fourth carbon of the third cyclic compound,
• wherein the R3 binds with the third carbon of the first cyclic compound, and
• wherein the R4 binds with the fourth carbon of the first cyclic compound, and
• wherein the iridium metal binds with the first nitrogen of the first cyclic compound and the second carbon of the second cyclic compound of the ligand.

A light emitting device comprising:

• a light emitting layer between a first electrode and a second electrode;
• a hole transporting layer between the first electrode and the light emitting layer;
• an electron transporting layer between the second electrode and the light emitting layer;
• and
• a mixed layer comprising an electron transporting material and an electron donating material between the electron transporting layer and the second electrode,
• wherein the light emitting layer comprises a host material and an organometallic complex, the organometallic complex comprising:
• an iridium metal;
• a first ligand and a second ligand, each comprising:
• a first cyclic compound comprising a first nitrogen, a second nitrogen, a first carbon, a second carbon, a third carbon, a fourth carbon;
• wherein the first nitrogen binds with the first carbon and the fourth carbon, the second nitrogen binds with the second carbon and the third carbon, the first carbon binds with the second carbon, the third carbon binds with the fourth carbon, the first cyclic compound includes a plurality of double bindings;
• a second cyclic compound comprising a first carbon, a second carbon, a third carbon, a fourth carbon, a fifth carbon and a sixth carbon;
• wherein the first carbon binds with the second carbon and the sixth carbon, the fourth carbon binds with the third carbon and the fifth carbon, the second carbon binds with the third carbon, the fifth carbon binds with the sixth carbon, the second cyclic compound includes a plurality of double bindings;
• a third cyclic compound comprising a first carbon, a second carbon, a third carbon, a fourth carbon, a fifth carbon and a sixth carbon;
• wherein the first carbon binds with the second carbon and the sixth carbon, the fourth carbon binds with the third carbon and the fifth carbon, the second carbon binds with the third carbon, the fifth carbon binds with the sixth carbon, the third cyclic compound includes a plurality of double bindings;
• R1 representing an fluorine;
• R2 representing an fluorine;
• R3 representing a carbon and three hydrogens;
• and
• R4 representing a hydrogen;
• wherein the first carbon of the first cyclic compound binds with the first carbon of the second cyclic compound,
• wherein the second carbon of the first cyclic compound binds with the first carbon of the second cyclic compound,
• wherein the R1 binds with the fourth carbon of the second cyclic compound,
• wherein the R2 binds with the fourth carbon of the third cyclic compound,
• wherein the R3 binds with the third carbon of the first cyclic compound, and
• wherein the R4 binds with the fourth carbon of the first cyclic compound, and
• a third ligand comprising a second carbon binds with a first carbon and a third carbon, a fourth carbon binds with third carbon and a fifth carbon, the second carbon binds with a first oxygen and the fourth carbon binds with a second oxygen,
• wherein the iridium metal binds with the first nitrogen of the first cyclic compound and the second carbon of the second cyclic compound of the first ligand, the first nitrogen of the first cyclic compound and the second carbon of the second cyclic compound of the second ligand and the first oxygen and the second oxygen of the third ligand.