Organic electroluminescent devices

1. An organic light-emitting device comprising an anode, a cathode, and an eluminescent region disposed between said anode and said cathode, said eluminescent comprising a light-emitting material of the formula

wherein R 1 is independently selected from the group consisting of an alkyl group, an aryl group, a heteroaryl group, an alkoxy group, an amino group, an alkyl amino group, and an aryl amino group; R2 is independently selected from the group consisting of hydrogen, and an alkyl group; R 3 is independently selected from the group consisting of hydrogen, an alkyl group, an alkoxy group, a halogen atom, and a cyano group; and, R4 is independently selected from the group consisting of hydrogen, an alkyl group, an aryl group, a heteroaryl group, an alkoxy group, a halogen atom, and a cyano group.

2. The organic light-emitting device according claim 1 , wherein said light-emitting material is of the formula

3. The organic light-emitting device according to claim 1 , wherein said light-emitting material is of the formula

4. The organic light-emitting device according to claim 1 , wherein said light-emitting material is of the formula

5. The organic light-emitting device according to claim 1 , wherein R 1 is independently selected from the group consisting of alkyl group having 1 to 10 carbon atoms, an alkyl group having 1 to about 10 carbon atoms wherein at least one of said R 1 alkyl groups comprises one or more halogen atoms, an aryl group having about 6 to about 30 carbon atoms, a heretoaryl group having about 5 to about 24 carbon atoms, and an alkoxy group having 1 to about 24 carbon atoms; R2 is independently selected from the group consisting of hydrogen, and an alkyl group having 1 to about 10 carbon atoms; and R 3 is independently selected from the group consisting of hydrogen, an alkyl group having 1 to about 10 carbon atoms, an alkoxy group having 1 to about 24 carbon atoms, and a halogen.

6. The organic light-emitting device according to claim 1 , wherein R 1 is an alkyl group having 1 to about 10 carbon atoms; R 2 is independently selected from the group consisting of hydrogen, and an alkyl group having 1 to about 10 carbon atoms; and R 3 is independently selected from the group consisting of hydrogen, and an alkyl group having 1 to about 10 carbon atoms.

7. The organic light-emitting device according to claim 1 , wherein R 1 is independently selected from the group consisting of methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, trifluoromethyl, methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, tert-butoxy, phenyl, and tert-butylphenyl; R 2 is independently selected from hydrogen, methyl, ethyl, propyl, and butyl; and R 3 is independently selected from the group consisting of hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, methoxy, ethoxy, butoxy, and tert-butoxy.

8. A display device comprising:

a first electrode;

a second electrode; and

a luminescent region disposed between said first and said second electrode, said luminescent region comprising a first charge transport layer, light-emitting layer, and a second charge transport layer,

wherein said light-emitting layer comprises a light-emitting material of the Formula I:

wherein R 1 is independently selected from the group consisting of an alkyl group, an aryl group, a heteroaryl group, an alkoxy group, an amino group, an alkyl amino group, and an aryl amino group; R 2 is independently selected from the group consisting of hydrogen, and an alkyl group; R 3 is independently selected from the group consisting of hydrogen, an alkyl group, an alkoxy group, a halogen atom, and a cyano group; and, R 4 is independently selected from the group consisting of hydrogen, an alkyl group, an aryl group, a heteroaryl group, an alkoxy group, a halogen atom, and a cyano group.

9. The display device according to claim 8 , wherein R 1 is independently selected from the group consisting of alkyl group having 1 to 10 carbon atoms, an alkyl group having 1 to about 10 carbon atoms wherein at least one of said R 1 alkyl groups comprises one or more halogen atoms, an aryl group having about 6 to about 30 carbon atoms, a heretoaryl group having about 5 to about 24 carbon atoms, and an alkoxy group having 1 to about 24 carbon atoms; R 2 is independently selected from the group consisting of hydrogen, and an alkyl group having 1 to about 10 carbon atoms; and R 3 is independently selected from the group consisting of hydrogen, an alkyl group having 1 to about 10 carbon atoms, an alkoxy group having 1 to about 24 carbon atoms, and a halogen.

10. The display device according to claim 8 , wherein R 1 is an alkyl group having 1 to about 10 carbon atoms; R 2 is independently selected from the group consisting of hydrogen, and an alkyl group having 1 to about 10 carbon atoms; and R 3 is independently selected from the group consisting of hydrogen, and an alkyl group having 1 to about 10 carbon atoms.

11. The display device according to claim 8 , wherein R 1 is independently selected from the group consisting of methyl, ethyl, propyl, isopropyl, isobutyl, butyl, tert-butyl, trifluoro methyl, methoxy, ethoxy, tert-butoxy, butoxy, phenyl, and tert-butyl phenyl; R 2 is independently selected from hydrogen, methyl, ethyl, propyl, and butyl; and R 3 is independently selected from hydrogen, methyl, ethyl, propyl, isopropyl, isobutyl, butyl, tert-butyl, methoxy, ethoxy, butoxy, and tert-butoxy.

12. The display device according to claim 8 , wherein R 1 is selected from the group consisting of an alkyl group having from about 1 to about 10 carbon atoms, and a halogenated alkyl group having from about 1 to about 10 carbon atoms; R 2 is hydrogen; and R 3 is hydrogen.

13. The display device according to claim 8 , wherein the light-emitting material is selected from the group consisting of