White light-emitting device structures
View Patent ↗A white light-emitting OLED device including a spaced anode and cathode, a hole-transporting layer disposed over the anode, and a first light-emitting layer disposed on the hole-transporting layer including an electron-transporting material host and a yellow dopant for producing yellow light. The device also includes a second light-emitting layer disposed on the first light-emitting layer and including a blue host and a blue dopant for producing blue light, and an electron-transporting layer disposed between the cathode and the second light-emitting layer.
1. A white light-emitting OLED device, comprising:
a) an anode and a cathode spaced apart from one another;
b) a hole-transporting layer disposed over the anode;
c) a first light-emitting layer disposed on the hole-transporting layer including an electron-transporting material host and a yellow light-emitting dopant for producing yellow light;
d) a second light-emitting layer disposed on the first light-emitting layer and including a blue host and a blue dopant for producing blue light; and
e) an electron-transporting layer disposed between the cathode and the second light-emitting layer.
2. The white light-emitting OLED device of claim 1 wherein the first light-emitting layer host includes Alq, Gaq, Inq, or Mgq.
3. The white light-emitting OLED device of claim 1 wherein the blue host includes ADN or TBADN.
4. The white light-emitting OLED device of claim 1 wherein the yellow light-emitting dopant includes
wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 represent one or more substituents on each ring where each substituent is individually selected from the following groups:
Group 1: hydrogen, or alkyl of from 1 to 24 carbon atoms;
Group 2: aryl or substituted aryl of from 5 to 20 carbon atoms;
Group 3: carbon atoms from 4 to 24 necessary to complete a fused aromatic ring of phenyl, naphthyl, anthracenyl, phenanthryl, pyrenyl, or perylenyl;
Group 4: heteroaryl or substituted heteroaryl of from 5 to 24 carbon atoms such as thiazolyl, furyl, thienyl, pyridyl, quinolinyl or other heterocyclic systems, which may be bonded via a single bond, or may complete a fused heteroaromatic ring system;
Group 5: alkoxylamino, alkylamino, or arylamino of from 1 to 24 carbon atoms; or
Group 6: fluorine, chlorine, bromine or cyano.
5. The white light-emitting OLED device of claim 4 wherein the yellow light-emitting dopant includes 5,6,11,12-tetraphenylnaphthacene (rubrene); 6,11-diphenyl-5,12-bis(4-(6-methyl-benzothiazol-2-yl)phenyl)naphthacene (DBzR) or 5,6,11,12-tetra(2-naphthyl)naphthacene (NR), with the following formulas:
6. The white light-emitting OLED device of claim 5 wherein the concentration of yellow light-emitting dopant 5,6,11,12-tetraphenylnaphthacene (rubrene); 6,11-diphenyl-5,12-bis(4-(6-methyl-benzothiazol-2-yl)phenyl)naphthacene (DBzR) or 5,6,11,12-tetra(2-naphthyl)naphthacene (NR) is in a range of from greater than 0 and less than 30% by volume of the electron-transporting material host.
7. The white light-emitting OLED device of claim 5 wherein the concentration of yellow light-emitting dopant 5,6,1 1,12-tetraphenylnaphthacene (rubrene); 6,11-diphenyl-5,12-bis(4-(6-methyl-benzothiazol-2-yl)phenyl)naphthacene (DBzR) or 5,6,11,12-tetra(2-naphthyl)naphthacene (NR) is preferably in a range of from greater than 0 and less than 5% by volume of the electron-transporting material host.
8. The white light-emitting OLED device of claim 1 wherein the thickness of the first light-emitting layer is between 5 nm to 100 nm.
9. The white light-emitting OLED device of claim 1 wherein the thickness of the second light-emitting layer is between 5 nm to 100 nm.
10. The white light-emitting OLED device of claim 1 wherein the blue dopant includes distyrylamine derivatives as shown by the formula
11. The white light-emitting OLED device of claim 1 wherein the blue-emitting dopant includes perylene and its derivatives.
12. The white light-emitting OLED device of claim 1 wherein the blue dopant is represented by the following formulas:
13. The white light-emitting OLED device of claim 12 wherein the concentration of blue-emitting dopants is in the range of greater than 0 and less than 10% by volume of the blue host.
14. The white light-emitting OLED device of claim 12 wherein thickness of the hole-transporting layer is between 10 nm–300 nm.
15. A white light-emitting OLED device, comprising:
a) an anode and a cathode spaced apart from one another;
b) a hole-transporting layer disposed over the anode;
c) a first light-emitting layer disposed on the hole-transporting layer including a first electron-transporting material host and a first yellow light-emitting dopant for producing yellow light;
d) a second light-emitting layer disposed on the first light-emitting layer and including a blue host and a blue dopant for producing blue light; and
e) at least one electron-transporting layer adjacent to the second light-emitting layer, and disposed between the second light-emitting layer and the cathode, comprising a second electron-transporting material host and a second yellow light-emitting dopant.
16. The white light-emitting OLED device of claim 15 wherein the first electron-transporting material host and the second electron-transporting material host are the same or different.
17. The white light-emitting OLED device of claim 15 wherein the first electron-transporting material host and the second electron-transporting material host includes Alq, Gaq, Inq, or Mgq.
18. The white light-emitting OLED device of claim 15 wherein the blue host in the second light-emitting layer includes ADN or TBADN.
19. The white light-emitting OLED device of claim 15 wherein the first or second yellow dopants include
wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 represent one or more substituents on each ring where each substituent is individually selected from the following groups:
Group 1: hydrogen, or alkyl of from 1 to 24 carbon atoms;
Group 2: aryl or substituted aryl of from 5 to 20 carbon atoms;
Group 3: carbon atoms from 4 to 24 necessary to complete a fused aromatic ring of phenyl, naphthyl, anthracenyl, phenanthryl, pyrenyl, or perylenyl;
Group 4: heteroaryl or substituted heteroaryl of from 5 to 24 carbon atoms such as thiazolyl, furyl, thienyl, pyridyl, quinolinyl or other heterocyclic systems, which may be bonded via a single bond, or may complete a fused heteroaromatic ring system;
Group 5: alkoxylamino, alkylamino, or arylamino of from 1 to 24 carbon atoms; or
Group 6: fluorine, chlorine, bromine or cyano.
20. The white light-emitting OLED device of claim 15 wherein the first and second yellow-emitting dopants includes 5,6,11,12-tetraphenylnaphthacene (rubrene); 6,11-diphenyl-5,12-bis(4-(6-methyl-benzothiazol-2-yl)phenyl)naphthacene (DBzR) or 5,6,11,12-tetra(2-naphthyl)naphthacene (NR), with the following formulas:
21. The white light-emitting OLED device of claim 15 wherein the first and the second yellow-emitting dopants each include 5,6,11,12-tetraphenylnaphthacene (rubrene); 6,11-diphenyl-5,12-bis(4-(6-methyl-benzothiazol-2-yl)phenyl)naphthacene (DBzR) or 5,6,11,12-tetra(2-naphthyl)naphthacene (NR) and the concentration of the first and second yellow-emitting dopants are individually in a range of from greater than 0 and less than 30% by volume of their corresponding host.
22. The white light-emitting OLED device of claim 21 wherein the concentration of yellow-emitting dopants 5,6,11,12-tetraphenylnaphthacene (rubrene); 6,11-diphenyl-5,12-bis(4-(6-methyl-benzothiazol-2-yl)phenyl)naphthacene (DBzR) or 5,6,11,1 2-tetra(2-naphthyl)naphthacene (NR) are individually in a range of from greater than 0 and less than 5% by volume of their corresponding host.
23. The white light-emitting OLED device of claim 15 wherein the thickness of the first emission layer is between 5 nm to 100 nm.
24. The white light-emitting OLED device of claim 15 wherein the thickness of the second emission layer is between 5 nm to 100 nm.
25. The white light-emitting OLED device of claim 15 wherein the blue dopant includes distyrylamine derivatives includes
26. The white light-emitting OLED device of claim 15 wherein the blue dopant includes perylene and its derivatives.
27. The white light-emitting OLED device of claim 15 wherein the blue dopant is represented by the following formulas:
28. The white light-emitting OLED device of claim 15 wherein the concentration of blue-emitting dopant is in the range of greater than 0 and less than 10% by volume of the blue host material.
29. The white light-emitting OLED device of claim 15 wherein thickness of the hole-transporting layer is between 10–300 nm.
30. A white light-emitting OLED device, comprising:
a) an anode and a cathode spaced apart from one another;
b) a first hole-transporting layer disposed over the anode;
c) a second hole-transporting layer disposed over the first hole-transporting layer and including a hole-transporting material host and a first yellow light-emitting dopant;
d) a first light-emitting layer disposed on the second hole-transporting layer including a first electron-transporting material host and a second yellow light-emitting dopant for producing yellow light;
e) a second light-emitting layer disposed on the first light-emitting layer including a blue host and a blue dopant for producing blue light; and
f) an electron-transporting layer disposed between the cathode and the second light-emitting layer.
31. The white light-emitting OLED device of claim 30 wherein the first and second yellow dopants are the same or different.
32. The white light-emitting OLED device of claim 30 wherein the first electron-transporting material host includes Alq, Gaq, Inq, or Mgq.
33. The white light-emitting OLED device of claim 30 wherein the blue host in the second emission layer includes ADN or TBADN.
34. The white light-emitting OLED device of claim 30 wherein the first or second yellow dopants include
wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 represent one or more substituents on each ring where each substituent is individually selected from the following groups:
Group 1: hydrogen, or alkyl of from 1 to 24 carbon atoms;
Group 2: aryl or substituted aryl of from 5 to 20 carbon atoms;
Group 3: carbon atoms from 4 to 24 necessary to complete a fused aromatic ring of phenyl, naphthyl, anthracenyl, phenanthryl, pyrenyl, or perylenyl;
Group 4: heteroaryl or substituted heteroaryl of from 5 to 24 carbon atoms such as thiazolyl, furyl, thienyl, pyridyl, quinolinyl or other heterocyclic systems, which may be bonded via a single bond, or may complete a fused heteroaromatic ring system;
Group 5: alkoxylamino, alkylamino, or arylamino of from 1 to 24 carbon atoms; or
Group 6: fluorine, chlorine, bromine or cyano.
35. The white light-emitting OLED device of claim 32 wherein the first and second yellow light-emitting dopants includes 5,6,11,12-tetraphenylnaphthacene (rubrene); 6,11 -diphenyl-5,12-bis(4-(6-methyl-benzothiazol-2-yl)phenyl)naphthacene (DBzR) or 5,6,11,12-tetra(2-naphthyl)naphthacene (NR), with the following formulas:
36. The white light-emitting OLED device of claim 35 wherein the concentration of the first and the second yellow light-emitting dopants 5,6,11,12-tetraphenylnaphthacene (rubrene); 6,11-diphenyl-5,12-bis(4-(6-methyl-benzothiazol-2-yl)phenyl)naphthacene (DBzR) or 5,6,11,12-tetra(2-naphthyl)naphthacene (NR) are individually in a range of from greater than 0 and less than 30% by volume of the their corresponding host.
37. The white light-emitting OLED device of claim 36 wherein the concentration of yellow light-emitting dopants 5,6,11,12-tetraphenylnaphthacene (rubrene); 6,11-diphenyl-5,12-bis(4-(6-methyl-benzothiazol-2-yl)phenyl)naphthacene (DBzR) or 5,6,11,12-tetra(2-naphthyl)naphthacene (NR) are individually in a range of from greater than 0 and less than 5% by volume of their corresponding host.
38. The white light-emitting OLED device of claim 30 wherein the thickness of the first light-emitting layer is between 5 nm to 100 nm.
39. The white light-emitting OLED device of claim 30 wherein the thickness of the second light-emitting layer is between 5–100 nm.
40. The white light-emitting OLED device of claim 30 wherein the thickness of the electron-transporting layer is between 5–100 nm.
41. The white light-emitting OLED device of claim 30 wherein the blue dopant includes distyrylamine derivatives includes
42. The white light-emitting OLED device of claim 30 wherein the blue-emitting dopant includes perylene and its derivatives.
43. The white light-emitting OLED device of claim 30 wherein the blue dopant is represented by the following formulas:
44. The white light-emitting OLED device of claim 30 wherein the concentration of blue-emitting dopants is in the range of greater than 0 and less than 10% by volume of the blue host material.