OLED DEVICE WITH ELECTRON TRANSPORT MATERIAL COMBINATION

1 . An OLED device comprising a cathode, an anode, and having there between a light-emitting layer, further comprising between the cathode and the light emitting layer, a non-luminescent electron transporting layer containing a compound with a 7,10-diaryl substituted fluoranthene nucleus having no aromatic rings annulated to the fluoranthene nucleus and an organic alkali metal salt, wherein the % volume of the organic alkali metal salt in the electron-transporting layer is in the range of greater than 70% but less than or equal to 90%.

2 . The OLED device of claim 1 wherein % volume of the organic alkali metal salt in the electron-transporting layer is in the range of 75% to 85%.

3 . An OLED device of claim 1 wherein the fluoranthene compound is according to Formula (I):

wherein

each Ar is an aromatic ring containing 6 to 24 carbon atoms bonded to the fluoranthene nucleus and they can be the same or different; and

R 1 -R 8 are individually selected from hydrogen and aromatic ring groups containing 6 to 24 carbon atoms with the proviso that no two adjacent R 1 -R 8 substituents can join to form an aromatic ring system fused to the fluoranthene nucleus.

4 . The OLED device of claim 3 wherein the fluoranthene compound is according to Formula (II):

wherein:

R 1 , R 2 , R 3 and R 4 are independently hydrogen or an aromatic group containing 6 to 24 carbon atoms with the proviso that any adjacent R 1 -R 4 is not joined to form part of an annulated aromatic ring system;

R is hydrogen or a substituent; and

n and m are independently 1-5.

5 . The OLED device of claim 4 wherein the fluoranthene compound is according to Formula (III-a) or (III-b):

wherein:

R 2 and R 4 are independently hydrogen or an aromatic group containing 6 to 24 carbon atoms with the proviso that R 2 and R 4 cannot both be hydrogen nor can R 2 be joined with R to form a ring;

R is hydrogen or an optional substituent; and

n and m are independently 1-5.

6 . The OLED device of claim 1 wherein the fluoranthrene is chosen from the group consisting of:

7 . The OLED device of claim 1 wherein the non-luminescent electron transporting layer contains a polycyclic aromatic hydrocarbon as an additional electron transporting material.

8 . The OLED device of claim 7 wherein the polycyclic aromatic hydrocarbon is an anthracene compound according to formula (P):

wherein

R 1 -R 10 are independently chosen from hydrogen, alkyl groups from 1-24 carbon atoms or aromatic groups from 1-24 carbon atoms.

9 . An OLED device of claim 1 wherein the organic alkali metal compound is according to Formula (IV):

(Li + ) m (Q) n   Formula (IV)

wherein:

Q is an anionic organic ligand; and

m and n are independently selected integers selected to provide a neutral charge on the complex.

10 . The OLED device of claim 9 wherein the organic alkali metal compound is according to Formula (V):

wherein:

Z and the dashed arc represent two to four atoms and the bonds necessary to complete a 5- to 7-membered ring with the lithium cation;

each A represents hydrogen or a substituent and each B represents hydrogen or an independently selected substituent on the Z atoms, provided that two or more substituents may combine to form a fused ring or a fused ring system;

j is 0-3 and k is 1 or 2; and

m and n are independently selected integers selected to provide a neutral charge on the complex.

11 . The OLED device of claim 10 wherein the A and B substituents of Formula (V) together form an additional ring system.

12 . The OLED device of claim 11 wherein the ring formed between the A and B substituents contains at least one heteroatom in addition to the nitrogen that is attached to A.

13 . The OLED device of claim 10 where the organic lithium compound is chosen from the group consisting of:

14 . The device of claim 1 wherein a compound with a 7,10-diaryl substituted fluoranthene nucleus having no aromatic rings annulated to the fluoranthene nucleus is additionally included in the LEL.

15 . The device of claim 1 wherein the LEL includes an anthracene compound as a host.

16 . The device of claim 1 wherein the host is selected from the following:

17 . A method of emitting light comprising applying an electric potential across the device of claim 1 .

18 . A display comprising the device of claim 1 .