Complex fluorene-containing compounds for use in OLED devices

1. An electroluminescent device, comprising:

a) a spaced-apart anode and cathode; and

b) an emissive layer disposed between the spaced-apart anode and cathode and including an organic compound having a complex fluorene structure represented the following Formula (I):

wherein:

X 1 , X 2 , X 3 , and X 4 include carbon atoms and at least one nitrogen atom; R 3 , and R 4 are substituents each being individually hydrogen, or amino, or alkyl, or alkenyl, or alkynyl, or alkoxy of from 1 to 40 carbon atoms; aryl or substituted aryl of from 6 to 60 carbon atoms; or heteroaryl or substituted heteroaryl of from 4 to 60 carbons; or F, Cl, or Br; or a cyano group; or a nitro group; or R 3 , or R 4 or both are groups that form fused aromatic or heteroaromatic rings; and R 1 and R 2 together form a cyclic ring having 3 to 20 carbon, nitrogen, sulfur or oxygen atoms; or R 1 and R 2 together form a double bond moiety.

2. An electroluminescent device, comprising:

a) a spaced-apart anode and cathode; and

b) an emissive layer disposed between the spaced-apart anode and cathode and including an organic compound having a complex fluorene structure represented by the following Formula (I):

wherein:

X 1 , X 2 , X 3 , and X 4 include carbon or nitrogen atoms; R 3 , and R 4 are substituents each being individually hydrogen, or amino, or alkyl, or alkenyl, or alkynyl, or alkoxy of from 1 to 40 carbon atoms; aryl or substituted aryl of from 6 to 60 carbon atoms; or heteroaryl or substituted heteroaryl of from 4 to 60 carbons; or F, Cl, or Br; or a cyano group; or a nitro group; or R 3 , or R 4 or both are groups that form fused aromatic or heteroaromatic rings; and R 1 and R 2 together form a cyclic ring having 3 to 20 carbon, nitrogen, sulfur or oxygen atoms; or R 1 and R 2 together form a double bond moiety wherein the organic compound having the complex fluorene structure is a molecule represented by Formula (II):

(Y 1 )y 1 —complex fluorene (I)—(Y 2 )y 2   (II)

wherein:

Y 1 and Y 2 each individually represent a substituted or unsubstituted alkyl, alkenyl, alkynyl, aryl, or heteroaryl or other conjugated groups, and y 1 and y 2 are integers from 1 to 6, and wherein Y 1 and Y 2 are the same or different.

3. An electroluminescent device, comprising:

a) a spaced-apart anode and cathode; and

b) an emissive layer disposed between the spaced-apart anode and cathode and including an organic compound having a complex fluorene structure represented by the following Formula (I):

wherein:

X 1 , X 2 , X 3 , and X 4 include carbon or nitrogen atoms; R 3 , and R 4 are substituents each being individually hydrogen, or amino, or alkyl, or alkenyl, or alkynyl, or alkoxy of from 1 to 40 carbon atoms; aryl or substituted aryl of from 6 to 60 carbon atoms; or heteroaryl or substituted heteroaryl of from 4 to 60 carbons; or F, Cl, or Br; or a cyano group; or a nitro group: or R 3 , or R 4 or both are groups that form fused aromatic or heteroaromatic rings; and R 1 and R 2 together form a cyclic ring having 3 to 20 carbon, nitrogen, sulfur or oxygen atoms; or R 1 and R 2 together form a double bond moiety wherein the organic compound having the complex fluorene structure is part of a polymer structure.

4. The polymer of claim 3 is represented by repeating units of Formula (III) or Formula (IV)

wherein:

X 5 and X 6 are linking groups, Y 1 and Y 2 are each individually represented as a substituted or unsubstituted alkyl, alkenyl, alkynyl, aryl, or heteroaryl or other conjugated groups, and y 1 and y 2 are integers from 0 to 6, and x is an integer from 0 to 6.