Organic electroluminescent element, illuminator and display

1. An organic electroluminescent element comprising an anode and a cathode having therebetween a light emitting layer, wherein the light emitting layer comprises a guest compound represented by one of Formulae (A-1) through (A-9) and a host compound represented by Formula (1):

wherein Ra represents an alkyl group, an aromatic hydrocarbon group or a heteroaromatic group, Rb and Rc each represent a hydrogen atom or a substituent selected from the group consisting of an alkyl group, an aromatic hydrocarbon group, an alkoxy group and a halogen atom; A1 represents a benzene ring or a pyridine ring;

wherein a plurality of A1 are the same or different, a plurality of Ra are the same or different, a plurality of Rb are the same or different and a plurality of Rc are the same or different, in each of Formulae (A-1) through (A-9);

wherein Ra 1 represents a phenyl group; R 1 and R 2 each represent a phenyl group or a pyridyl group; R 5 represents a substituent selected from Group 1; and n1, n2 and n5 each represent an integer of 0 to 4,

wherein the Group 1 substituent is selected from the group consisting of

an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aromatic hydrocarbon group, an aromatic heterocycle group, a heterocycle group, an alkoxy group, a cycloalkoxyl group, an aryloxy group, an alkylthio group, a cycloalkylthio group, an arylthio group, an alkoxycarbonyl group, an aryloxycarbonyl group, a sulfamoyl group, an acyl group, an acyloxy group, an amide group, a carbamoyl group, an ureido group, a sulfinyl group, an alkylsulfonyl group, an arylsulfonyl group, an amino group, a halogen atom, a hydrofluorocarbon group, a cyano group, a nitro group, a hydroxyl group, a mercapto group and a silyl group.

2. The organic electroluminescent element of claim 1 , wherein the aromatic hydrocarbon ring represented by A1 in any one of Formula (A-1) through (A-9) is a benzene ring.

3. The organic electroluminescent element of claim 1 which emits blue light.

4. The organic electroluminescent element of claim 1 which emits white light.

5. A display comprising the organic electroluminescent element of claim 1 .

6. An illuminator comprising the organic electroluminescent element of claim 1 .

7. A display comprising the illuminator of claim 6 and a liquid crystal cell as a display means.

8. The organic electroluminescent element of claim 1 , wherein R 5 in Formula (1) represents an aromatic hydrocarbon group or an aromatic heterocycle group.

9. An organic electroluminescent element comprising an anode and a cathode having therebetween a light emitting layer, wherein the light emitting layer comprises a guest compound represented by one of Formula (B-1) through (B-3) and a host compound represented by Formula (1):

wherein Ra represents an alkyl group or an aromatic hydrocarbon group; Rb, Rc, Rb 1 and Rc 1 each represent a hydrogen atom; A1 represents a benzene ring; M represents Ir;

Formula (1)

wherein Ra 1 represents a phenyl group; R 1 and R 2 each represent a phenyl group or a pyridyl group, R 5 represents a substituent selected from Group 1; and n1, n2 and n5 each represent an integer of 0 to 4,

wherein the Group 1 substituent is selected from the group constituting of

an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aromatic hydrocarbon group, an aromatic heterocycle group, a heterocycle group, an alkoxy group, a cycloalkoxyl group, an aryloxy group, an alkylthio group, a cycloalkylthio group, an arylthio group, an alkoxycarbonyl group, an aryloxycarbonyl group, a sulfamoyl group, an acyl group, an acyloxy group, an amide group, a carbamoyl group, an ureido group, a sulfinyl group, an alkylsulfonyl group, an arylsulfonyl group, an amino group, a halogen atom, a hydrofluorocarbon group, a cyano group, a nitro group, a hydroxyl group, a mercapto group and a silyl group.

10. An organic electroluminescent element comprising an anode and a cathode having therebetween a light emitting layer, wherein the light emitting layer comprises a guest compound represented by one of Formulae (C-1) through (C-3) and a host compound represented by Formula (I):

wherein Ra represents an alkyl group or an aromatic hydrocarbon group; Rb, and Rc each represent a hydrogen atom or an alkyl group; A1 represents a benzene ring; M represents Ir;

wherein Ra 1 represents a phenyl group; R 1 and R 2 each represent a phenyl group or a pyridyl group, R 5 represents a substituent selected from Group 1; and n1, n2 and n5 each represent an integer of 0 to 4,

wherein the Group 1 substituent is selected from the group consisting of

an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aromatic hydrocarbon group, an aromatic heterocycle group, a heterocycle group, an alkoxy group, a cycloalkoxyl group, an aryloxy group, an alkylthio group, a cycloalkylthio group, an arylthio group, an alkoxycarbonyl group, an aryloxycarbonyl group, a sulfamoyl group, an acyl group, an aryloxy group, an amide group, a carbamoyl group, an ureido group, a sulfinyl group, an alkylsulfonyl group, an arylsulfonyl group, an amino group, a halogen atom, a hydrofluorocarbon group, a cyano group, a nitro group, a hydroxyl group, a mercapto group and a silyl group.

11. The organic electroluminescent element of claim 10 , wherein R 5 in Formula (1) represents an aromatic hydrocarbon group or an aromatic heterocycle group.