Stable organic light-emitting devices using aminoanthracenes

1. An organic light-emitting device, comprising:

a) a substrate;

b) an anode and a cathode disposed over the substrate;

c) a luminescent layer disposed between the anode and the cathode wherein the luminescent layer includes a host and at least one dopant;

d) the host of the luminescent layer being selected to include a solid organic material comprising a mixture of at least two components wherein:

i) the first component of the mixture contains a non-emissive aminoanthracene compound of the formula:

wherein:

R 1 to R 9 are individually hydrogen, fluoro, halogen, hydroxy, nitro, cyano, unbranched alkyl or substituted unbranched alkyl of from 1 to 24 carbon atoms, branched alkyl or substituted branched alkyl of from 1 to 24 carbon atoms, cyclic alkyl or substituted cyclic alkyl of from 1 to 24 carbon atoms, aryl or substituted aryl of from 5 to 40 carbon atoms, heterocyclic or substituted heterocyclic, alkenyl or substituted alkenyl, alkoxy or substituted alkoxy, aryloxy or substituted aryloxy, aromatic hydrocarbon or substituted aromatic hydrocarbon; Ar 1 and Ar 2 are individually aryl or substituted aryl of from 5 to 40 carbon atom; and

ii) the second component of the mixture contains an organic compound having a dipole moment larger than that of the first component; and

e) the dopant of the luminescent layer having a bandgap smaller than that of both the first and second components of the host and providing emission centers wherein the dopant produces blue, blue-green, green, green-yellow, or yellow light.

2. The organic light-emitting device of claim 1 wherein the first component of the host constitutes at least 1% by volume of the luminescent layer.

3. The organic light-emitting device of claim 1 wherein the first component of the host constitutes preferably 25-75% by volume of the luminescent layer.

4. The organic light-emitting device of claim 1 wherein the second component includes an oxinoid compound.

5. The organic light-emitting device of claim 4 wherein the second component includes AlQ 3 .

6. The organic light-emitting device of claim 1 wherein the second component of the host constitutes preferably 75-25% by volume of the luminescent layer.

7. The organic light-emitting device of claim 1 wherein the dopant concentration in the luminescent layer is between 0.1 and 10% by volume.

8. The organic light-emitting device of claim 1 wherein the dopant includes a coumarin dye.

9. The organic light-emitting device of claim 8 wherein the dopant includes C-6, C-545T, or C-525T.

10. The organic light-emitting device of claim 1 wherein the dopant includes a quinacridone dye.

11. The organic light-emitting device of claim 10 wherein the dopant includes QA, DMQA, CFDMQA, or DPQA.

12. The organic light-emitting device of claim 1 wherein the first component of the host includes a compound of the formula: