Electroluminescent device with quinazoline complex emitter

1. An OLED device comprising a cathode, an anode, and located therebetween a light-emitting layer containing a host material and a tris-C^N-cyclometallated complex represented by Formula (2d):

wherein:

each d 1 represents an independently selected substituent and s is 0-4;

each d 2 represents an independently selected substituent and t is 0-4; and

d 3 represents hydrogen or a substituent.

2. A tris-C^N-cyclometallated complex is represented by Formula (2d):

wherein:

each d 1 represents an independently selected substituent and s is 0-4;

each d 2 represents an independently selected substituent and t is 0-4; and

d 3 represents hydrogen or a substituent.

3. The device of claim 1 wherein the host material comprises an aluminum complex.

4. The device of claim 3 wherein the host comprises a material of Formula (4):

wherein:

each Ar a and each Ar b may be the same or different and each independently represents an aromatic group;

each R a and each R b may be the same or different and each independently represents a substituent group; and

n and m independently are 0-4.

5. The device of claim 1 wherein the host material comprises a material of Formula (3):

wherein:

M 1 represents Al or Ga;

R 2 through R 7 each independently represent hydrogen or a substituent group, and

L represents an aromatic group.

6. The device of claim 1 wherein the host comprises a triaryl amine.

7. The device of claim 1 wherein the host material comprises an aluminum complex and a triaryl amine.

8. The device of claim 1 wherein the host material comprises a carbazole biphenyl compound.

9. The device of claim 8 wherein the host material comprises 4,4′-N,N′-dicarbazole-biphenyl.

10. The tris-C^N-cyclometallated complex