Organic light emitting diode display including capping layer having high refractive index

1. An organic light emitting diode display, comprising:

a first substrate;

a first electrode on the first substrate;

an organic light emitting layer on the first electrode;

a second electrode on the organic light emitting layer; and

a capping layer on the second electrode,

wherein the capping layer includes at least one heterocyclic compound, the heterocyclic compound including a carbazole group and a heterocyclic group bonded with the carbazole group, and

wherein the heterocyclic group bonded with the carbazole group includes a 6-membered ring with a heteroatom in the 6-membered ring.

2. The organic light emitting diode display as claimed in claim 1 , wherein the heterocyclic compound is represented by one of the following Chemical Formulae 1 to 5:

wherein, in Chemical Formulae 1 to 5,

A 1 to A 7 are each independently a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms or a substituted or unsubstituted aromatic heterocyclic group having 1 to 30 ring carbon atoms, one of A 1 or A2 including the 6-member ring with a heteroatom in the ring, one of A 3 , A 4 , or A 5 , including the 6-membered ring with a heteroatom in the ring, and one of A 6 or A 7 including the 6-membered ring with a heteroatom in the ring;

Y 1 to Y 16 are each independently C—R or a nitrogen atom, wherein each R of the C—R is independently one of a hydrogen atom, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 1 to 30 ring carbon atoms, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms and having a linear, branched, or cyclic structure, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted haloalkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted haloalkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 30 carbon atoms, a substituted or unsubstituted dialkylarylsilyl group having 8 to 40 carbon atoms, a substituted or unsubstituted alkyldiarylsilyl group having 13 to 50 carbon atoms, a substituted or unsubstituted triarylsilyl group having 18 to 60 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 30 carbon atoms, a halogen atom, a cyano group, a hydroxyl group, a nitro group, or a carboxyl group;

R of adjacent C—R, when two of Y 1 to Y 16 that are adjacent to each other are C—R, are separate or are combined to form a cyclic structure;

L 1 to L 12 are each independently a single bond or a connecting group;

X 1 is carbon or silicon;

R 1 and R 2 are each independently a hydrogen atom, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 1 to 30 ring carbon atoms, or a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, R 1 and R 2 being separate or bonded together to form a cyclic structure; and

X 2 is boron, phosphorus, or P═O.

3. The organic light emitting diode display as claimed in claim 2 , wherein the compound represented by Chemical Formula 1 is one of the following Compounds 1 to 48:

4. The organic light emitting diode display as claimed in claim 2 , wherein the compound represented by Chemical Formula 2 is one of the following Compounds 49 to 73

5. The organic light emitting diode display as claimed in claim 2 , wherein the compound represented by Chemical Formula 3 is one of the following Compounds 74 to 78

6. The organic light emitting diode display as claimed in claim 2 , wherein the compound represented by Chemical Formula 4 is one of the following Compounds 79 to 84

7. The organic light emitting diode display as claimed in claim 2 , wherein the compound represented by Chemical Formula 5 is one of the following Compounds 85 to 88

8. The organic light emitting diode display as claimed in claim 1 , wherein the capping layer has a refractive index of about 1.9 or higher.

9. The organic light emitting diode display as claimed in claim 1 , wherein the capping layer has a refractive index of about 1.9 to about 3.0.

10. The organic light emitting diode display as claimed in claim 1 , wherein the capping layer has a thickness of about 10 nm to about 300 nm.

11. The organic light emitting diode display as claimed in claim 1 , further comprising at least one of a hole injection layer and a hole transporting layer between the first electrode and the organic light emitting layer.

12. The organic light emitting diode display as claimed in claim 1 , further comprising at least one of an electron transporting layer and an electron injection layer between the organic light emitting layer and the second electrode.

13. The organic light emitting diode display as claimed in claim 1 , further comprising a second substrate on the capping layer, the second substrate being spaced apart from the capping layer.

14. The organic light emitting diode display as claimed in claim 13 , further comprising an air layer in a space between the capping layer and the second substrate.

15. The organic light emitting diode display as claimed in claim 13 , further comprising a filling member in a space between the capping layer and the second substrate.

16. The organic light emitting diode display as claimed in claim 1 , further comprising a thin film encapsulation layer on the capping layer.

17. An organic light emitting diode display, comprising:

a first substrate;

a first electrode on the first substrate;

an organic light emitting layer on the first electrode;

a second electrode on the organic light emitting layer;

a capping layer on the second electrode; and

a second substrate on the capping layer, the second substrate being spaced apart from the capping layer,

wherein the capping layer includes at least one heterocyclic compound, the heterocyclic compound including a carbazole group and a heterocyclic group bonded with the carbazole group.

18. An organic light emitting diode display, comprising:

a first substrate;

a first electrode on the first substrate;

an organic light emitting layer on the first electrode;

a second electrode on the organic light emitting layer; and

a capping layer on the second electrode; and

a thin film encapsulation layer on the capping layer,

wherein the capping layer includes at least one heterocyclic compound, the heterocyclic compound including a carbazole group and a heterocyclic group bonded with the carbazole group.