Organic electroluminescent device and host material of luminescent and hole-blocking material thereof

1. An electroluminescent device, comprising:

a substrate;

an anode, disposed on the substrate;

an organic luminescent layer, disposed on the anode; and

a cathode, disposed on the organic luminescent layer, wherein the organic luminescent layer comprises a fluorene compound as Formula (1):

wherein Ar1 and Ar2 each represents an aryl group having from 6 to 12 carbon atoms; G1 and G2 each represents an aryl group having from 6 to 24 carbon atoms, a boron group, or a silyl group having from 3 to 18 atoms; and wherein n is an integer from 1 to 4.

2. The electroluminescent device of claim 1 , wherein each of Ar1 and Ar2 is selected from the group consisting of: phenyl, biphenyl, tolyl, naphthyl, anthranyl, and phenanthryl.

3. The electroluminescent device of claim 1 , wherein the boron group comprises an aryl group having from 6 to 12 atoms.

4. The electroluminescent device of claim 1 further comprising a hole-blocking layer, disposed between the cathode and the organic luminescent layer.

5. The electroluminescent device of claim 4 , wherein the hole-blocking layer comprises the compound of formula (1).

6. The electroluminescent device of claim 4 further comprising an electron transport layer, disposed between the hole-blocking layer and the cathode.

7. The electroluminescent device of claim 6 further comprising an electron injection layer, disposed between the electron transport layer and the cathode.

8. The electroluminescent device of claim 1 further comprising a hole transport layer, disposed between the anode and the organic luminescent layer.

9. The electroluminescent device of claim 8 further comprising a hole injection layer, disposed between the anode and the hole transport layer.

10. The electroluminescent device of claim 1 , wherein the organic luminescent layer further comprises a dopant.

11. The electroluminescent device of claim 10 , wherein the dopant is selected from the group consisting of at least two of: FIr(pic) 3 , Ir(ppy) 3 , Ir(m-ppy) 3 , Ir(btp) 2 (acac), Ir(btp) 3 , Ir(DBQ) 2 (acac), PtOEP, Ir(tpy) 2 (pz2BEt 2 ), Ir(tpy) 2 (pz2BPh2), Ir(piq) 2 (acac), Ir(piq-F) 2 (acac), Ir(pbq-F) 2 (acac), Ir(piq-F) 3 , Ir(piq) 3 , and Ir(pbq) 3 , and the formula of the dopants comprises:

12. An electroluminescent device, comprising:

a substrate;

an anode, disposed on the substrate;

an organic luminescent layer, disposed on the anode; and

a cathode, disposed on the organic luminescent layer, wherein the organic luminescent layer comprises a fluorene compound as Formula (1):

wherein Ar1 and Ar2 each represents an aryl group having from 6 to 12 carbon atoms; G1 and G2 each represents a boron group; and wherein n is an integer from 1 to 4.

13. The electroluminescent device of claim 12 , wherein the boron group comprises an aryl group having from 6 to 12 atoms.

14. The electroluminescent device of claim 12 , further comprising a hole-blocking layer, disposed between the cathode and the organic luminescent layer; and wherein the hole-blocking layer comprises the compound of formula (1).

15. The electroluminescent device of claim 12 , further comprising

a hole-blocking layer, disposed between the cathode and the organic luminescent layer;

an electron transport layer, disposed between the hole-blocking layer and the cathode; and

an electron injection layer, disposed between the electron transport layer and the cathode.

16. An electroluminescent device, comprising:

a substrate;

an anode, disposed on the substrate;

an organic luminescent layer, disposed on the anode; and

a cathode, disposed on the organic luminescent layer, wherein the organic luminescent layer comprises a fluorene compound as Formula (1):

wherein Ar1 and Ar2 each represents an aryl group having from 6 to 12 carbon atoms; G1 and G2 each represents a silyl group having from 3 to 18 atoms or a triphenyl silyl group; and wherein n is an integer from 1 to 4.

17. An electroluminescent device of claim 16 , wherein G1 and G2 each represents a silyl group having from 3 to 18 atoms.

18. The electroluminescent device of claim 17 , further comprising a hole-blocking layer, disposed between the cathode and the organic luminescent layer; and wherein the hole-blocking layer comprises the compound of formula (1).

19. The electroluminescent device of claim 17 , further comprising

a hole-blocking layer, disposed between the cathode and the organic luminescent layer;

an electron transport layer, disposed between the hole-blocking layer and the cathode; and

an electron injection layer, disposed between the electron transport layer and the cathode.