Electroluminescent Materials and Devices

1 - 28 . (canceled)

29 . A hole transport compound which is a diamino dianthracene of formula

where Ar 1 , Ar 2 , Ar 3 and Ar 4 are the same or different substituted or unsubstituted aromatic groups or together form a heterocyclic ring with the nitrogen atom.

30 . The compound of claim 29 in which:

the substituted or unsubstituted monocyclic or polycyclic aromatic groups are selected from bisphenyl, naphthyl, anthracenyl, and

substituents can be selected from hydrogen, and alkyl, alkoxy, aryl, aryloxy, heterocyclic and carboxy groups and trifluoromethyl.

31 . The compound of claim 29 , wherein the groups Ar 1 , Ar 2 , Ar 3 and Ar 4 are selected from

32 . Any of the following compounds:

N*10*,N*10′*Bis-biphenyl-4-yl-N*10*,N*10′*-di-m-toly-[9,9′]bianthracenyl-10,10′-diamine;

N*10*,N*10′*-Di-naphthen-yl-N*10*,N*10*-di-m-toly-[9,9′]bianthracenyl-10,10′-diamine;

N*10*,N*10′*-Bis-(3-methoxy-phenyl)-N*10*,N*10′*-diphenyl[9,9′]bianthracenyl-10,10′-diamine;

N*10*,N*10′*-Di-naphthen-2-yl-N*10*,N*10′*-di-phenyl-[9,9′ ]bianthracenyl-10,10′-diamine; and

33 . A method for making a diamino dianthracene which comprises aminating 10,10′-dibromo-[9,9′]-bianthracene of formula

with an amine of formula Ar 1 NHAr 2 where Ar 1 and Ar 2 are the same or different substituted or unsubstituted aromatic groups or together with the nitrogen atom to which they are attached form a heterocyclic ring.

34 . The method of claim 33 , wherein the amination is with an amine of formula Ar 1 NHAr 2 where Ar 1 and Ar 2 are different substituted or unsubstituted aromatic groups.

35 . The method of claim 33 , wherein the amination is with an amine in which the groups Ar 1 , Ar 2 are selected from

36 . The method of any of claim 33 wherein the amination is carried out by heating 10,10′-dibromo-[9,9′]-bianthracene and the amine in the presence of sodium t-butoxide, palladium(II)acetate and tris-t-butyl-phosphane in o-xylene under an atmosphere of dry argon gas.

37 . An electroluminescent device which comprises (i) a first electrode, (ii) a layer comprising a hole transport compound as defined in claim 29 , (iii) a layer of an electroluminescent material and (iv) a second electrode.

38 . The device of claim 37 , wherein the electroluminescent material is: a polymer electroluminescent compound.

39 . The device of claim 37 , wherein the electroluminescent compound is a small molecule organometallic electroluminescent compound.

40 . The device of claim 37 wherein the electroluminescent compound is selected from lithium quinolate, aluminium quinolate, zirconium quinolate, hafnium quinolate, gallium thioquinolate and indium thioquinolate.

41 . The device claim 37 , wherein there is a layer of an electron injecting material between the cathode and the electroluminescent material layer.

42 . The device of claim 41 , wherein the electron injecting material is selected from metal quinolates, and complexes of formula Mx(DBM) n where Mx is a metal and DBM is dibenzoyl methane and n is the valency of Mx.

43 . The device of claim 42 in which the metal quinolate is an aluminium quinolate or lithium quinolate.

44 . The device of claim 37 , wherein the first electrode is the anode and is indium tin oxide coated glass or another a transparent substrate.

45 . The device of claim 44 , wherein the cathode is selected from aluminium, calcium, lithium, magnesium and alloys thereof.

46 . The device of claim 45 , wherein there is a layer of a metal fluoride layer formed on the metal cathode.