Organic electroluminescent element, illuminator, and display
View Patent ↗Disclosed are an organic electroluminescent element comprising a light emission layer containing a phosphorescent compound and a hole transporting layer adjacent thereto containing a hole transporting material, wherein the hole transporting material has a 0-0 band of the phosphorescence spectra of from 300 to 450 nm and has a molecular weight of not less than 550, and an illuminator and a display each comprising the organic electroluminescent element.
1. An organic electroluminescent element comprising a light emission layer containing a phosphorescent compound and a hole transporting layer adjacent thereto containing a hole transporting material, wherein the hole transporting material has a 0-0 band of the phosphorescence spectra of from 300 to 450 nm and has a molecular weight of not less than 550, and is a triarylamine compound represented by the following Formula 4-1 or 4-2:
wherein Ar 801 through Ar 803 independently represent a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group; and R 801 through R 827 independently represent a hydrogen atom or a substituent, provided that at least one of R 801 and R 802 is a substituent, at least one of R 803 and R 804 is a substituent, at least one of R 805 and R 806 is a substituent, at least one of R 807 through R 810 is a substituent, at least one of R 811 through R 814 is a substituent, and at least one of R 815 through R 818 is a substituent.
2. The organic electroluminescent element of claim 1 , wherein the hole transporting material has an ionization potential Ip1 of from 5.00 to 5.70 eV.
3. The organic electroluminescent element of claim 1 , wherein
−0.1 (eV)≦ Ip 3 −Ip 1≦0.5 (eV)
where Ip1 (eV) represents the ionization potential of the hole transporting material, and Ip3 (eV) represents the ionization potential of the phosphorescent compound.
4. The organic electroluminescent element of claim 1 , wherein
0.5 (eV)< T 3 −Ea 1<1.3 (eV)
where T3 (eV) represents the excited triplet energy level of the phosphorescent compound and Ea1 (eV) represents the electron affinity of the hole transporting material.
5. The organic electroluminescent element of claim 1 , wherein the phosphorescent compound has a phosphorescence maximum in the wavelength regions of from 380 to 480 nm.
6. The organic electroluminescent element of claim 1 , further comprising a second hole transporting layer containing a second hole transporting material, the second hole transporting layer being provided on the surface of the hole transporting layer opposite the light emission layer, wherein
0.1 (eV)< Ip 1 −Ip 4<0.7 (eV)
where Ip1 (eV) represents the ionization potential of the hole transporting material, and Ip4 (eV) represents the ionization potential of the second hole transporting material.
7. The organic electroluminescent element of claim 6 , wherein the thickness of the hole transporting layer adjacent to the light emission layer is from 5 to 20 nm.
8. The organic electroluminescent element of claim 1 , wherein the light emission layer further contains a host compound.
9. The organic electroluminescent element of claim 8 , wherein
0.3 (eV)< Ip 2 −Ip 1<1.0 (eV)
where Ip1 (eV) represents the ionization potential of the hole transporting material and Ip2 (eV) represents the ionization potential of the host compound.
10. The organic electroluminescent element of claim 8 , wherein
0.1 (eV)< Ea 2 −Ea 1<0.8 (eV)
where Ea1 (eV) represents the electron affinity of the hole transporting material and Ea2 (eV) represents the electron affinity of the host compound.
11. The organic electroluminescent element of claim 8 , wherein the host compound has a 0-0 band of the phosphorescence spectra of from 300 to 450 nm.
12. The organic electroluminescent element of claim 8 , wherein the host compound is a carbazole derivative.
13. The organic electroluminescent element of claim 12 , wherein the carbazole derivative is a compound represented by the following formula 11,
wherein R 1001 through R 1013 independently represent a hydrogen atom or a substituent, provided that at least one of R 1001 through R 1013 is a substituent.
14. The organic electroluminescent element of claim 12 , wherein the carbazole derivative is a compound represented by the following formula 12,
wherein R 1021 represents an alkyl group, a cycloalkyl group or a fluoroalkyl group; and R 1022 through R 1029 independently represent a hydrogen atom or a substituent, provided that at least one of R 1022 through R 1029 is a substituent.
15. The organic electroluminescent element of claim 12 , wherein the carbazole derivative is a compound represented by the following formula 13,
wherein R 1031 through R 1046 independently represent a hydrogen atom or a substituent; and L 3 represents a chemical bond or a divalent linkage group, provided that when L 3 represents a chemical bond, at least one of R 1037, R 1038, R 1045, and R 1046 is a substituent.
16. The organic electroluminescent element of claim 12 , wherein the carbazole derivative is a compound represented by the following formula 14,
wherein R 1051 through R 1063 independently represent a hydrogen atom or a substituent, provided that at least one of R 1057, R 1058, R 1062, and R 1063 is a substituent.
17. The organic electroluminescent element of claim 12 , wherein the carbazole derivative is a compound represented by the following formula 15,
wherein R 1071 through R 1079 independently represent a hydrogen atom or a substituent, provided that at least one of R 1072 and R 1073 is a substituent; and n is an integer of from 1 to 8.
18. The organic electroluminescent element of claim 1 , wherein the triarylamine compound is a compound represented by the following formula 5,
wherein R 960 through R 976 independently represent a hydrogen atom or a substituent, provided that at least one of R 960 and R 961 is a substituent and at least one of R 963 and R 964 is a substituent; and L 1 represents a chemical bond or a divalent linkage group.
19. The organic electroluminescent element of claim 1 , wherein the triarylamine compound is a compound represented by the following formula 6,
wherein R 960 through R 976 independently represent a hydrogen atom or a substituent; and L 2 represents an alkylene group, a cycloalkylene group or a fluoroalkylene group.
20. The organic electroluminescent element of claim 1 , wherein the triarylamine compound comprises a terminal group represented by the following formula 10-1, 10-2, 10-3 or 10-4,
wherein X 9 and X 10 independently represent N, O, S or CR 611 in which R 611 represents a hydrogen atom or a substituent, provided that at least one of X 9 and X 10 represents CR 611 in which R 611 represents a substituent; Z 601 represents an atomic group necessary to form an aromatic hydrocarbon ring or an aromatic heterocyclic ring; R 601 through R 605 independently represent a hydrogen atom or a substituent, provided that at least one of R 601 and R 605 is a substituent; and R 606 through R 610 independently represent a substituent.
21. An organic electroluminescent element comprising a light emission layer containing a phosphorescent compound and a hole transporting layer adjacent thereto containing a hole transporting material, wherein the hole transporting material is a triarylamine compound represented by the following Formula 4-1 or4-2:
wherein Ar 801 through Ar 803 independently represent a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group; and R 801 through R 827 independently represent a hydrogen atom or a substituent, provided that at least one of R 801 and R 802 is a substituent, at least one of R 803 and R 804 is a substituent, at least one of R 805 and R 806 is a substituent, at least one of R 807 through R 810 is a substituent, at least one of R 811 through R 814 is a substituent, and at least one of R 815 through R 818 is a substituent.
22. The organic electroluminescent element of claim 21 , wherein the triarylamine compound is a compound represented by the following formula 5,
wherein R 960 through R 976 independently represent a hydrogen atom or a substituent, provided that at least one of R 960 and R 961 is a substituent, and at least one of R 963 and R 964 is a substituent; and L 1 represents a chemical bond or a divalent linkage group.
23. The organic electroluminescent element of claim 21 , wherein the triarylamine compound is a compound represented by the following formula 6,
wherein R 960 through R 976 independently represent a hydrogen atom or a substituent; and L 2 represents an alkylene group, a cycloalkylene group or a fluoroalkylene group.
24. The organic electroluminescent element of claim 21 , wherein the triarylamine compound is a compound having a terminal group represented by the following formula 10-1, 10-2, 10-3 or 10-4,
wherein X 9 and X 10 independently represent N, O, S or CR 611 in which R 611 represents a hydrogen atom or a substituent, provided that at least one of X 9 and X 10 represents CR 611 in which R 611 represents a substituent; Z 601 represents an atomic group necessary to form an aromatic hydrocarbon ring or an aromatic heterocyclic ring; R 601 through R 605 independently represent a hydrogen atom or a substituent, provided that at least one of R 601 and R 605 is a substituent; and R 606 through R 610 independently represent a substituent.
25. The organic electroluminescent element of claim 21 , wherein the hole transporting material has a molecular weight of not less than 550.
26. The organic electroluminescent element of claim 21 , wherein the hole transporting material has an ionization potential Ip1 of from 5.00 to 5.70 eV.
27. The organic electroluminescent element of claim 21 , wherein
−0.1 (eV)≦ Ip 3 −Ip 1≦0.5 (eV)
where Ip1 (eV) represents the ionization potential of the hole transporting material, and Ip3 (eV) represents the ionization potential of the phosphorescent compound.
28. The organic electroluminescent element of claim 21 , wherein
0.5 (eV)< T 3 −Ea 1<1.3 (eV)
where T3 (eV) represents the excited triplet energy level of the phosphorescent compound and Ea1 (eV) represents the electron affinity of the hole transporting material.
29. The organic electroluminescent element of claim 21 , wherein the phosphorescent compound has a phosphorescence maximum in the wavelength regions of from 380 to 480 nm.
30. The organic electroluminescent element of claim 21 , further comprising a second hole transporting layer containing a second hole transporting material, the second hole transporting layer being provided on the surface of the hole transporting layer opposite the light emission layer, wherein
0.1 (eV)< Ip 1 −Ip 4<0.7 (eV)
where Ip1 (eV) represents the ionization potential of the hole transporting material, and Ip4 (eV) represents the ionization potential of the second hole transporting material.
31. The organic electroluminescent element of claim 30 , wherein the thickness of the hole transporting layer adjacent to the light emission layer is from 5 to 20 nm.
32. The organic electroluminescent element of claim 21 , wherein the light emission layer further contains a host compound.
33. The organic electroluminescent element of claim 21 , wherein
0.3 (eV)< Ip 2 −Ip 1<1.0 (eV)
where Ip1 (eV) represents the ionization potential of the hole transporting material and Ip2 (eV) represents the ionization potential of the host compound.
34. The organic electroluminescent element of claim 21 , wherein
0.1 (eV)< Ea 2 −Ea 1<0.8 (eV)
where Ea1 (eV) represents the electron affinity of the hole transporting material and Ea2 (eV) represents the electron affinity of the host compound.
35. The organic electroluminescent element of claim 21 , wherein the host compound has a 0-0 band of the phosphorescence spectra of from 300 to 450 nm.
36. The organic electroluminescent element of claim 21 , wherein the host compound is a carbazole derivative.
37. The organic electroluminescent element of claim 36 , wherein the carbazole derivative is a compound represented by the following formula 11,
wherein R 1001 through R 1013 independently represent a hydrogen atom or a substituent, provided that at least one of R 1001 through R 1013 is a substituent.
38. The organic electroluminescent element of claim 36 , wherein the carbazole derivative is a compound represented by the following formula 12,
wherein R 1021 represents an alkyl group, a cycloalkyl group or a fluoroalkyl group; and R 1022 through R 1029 independently represent a hydrogen atom or a substituent, provided that at least one of R 1022 through R 1029 is a substituent.
39. The organic electroluminescent element of claim 36 , wherein the carbazole derivative is a compound represented by the following formula 13,
wherein R 1031 through R 1046 independently represent a hydrogen atom or a substituent; and L 3 represents a chemical bond or a divalent linkage group, provided that when L 3 represents a chemical bond, at least one of R 1037, R 1038, R 1045, and R 1046 is a substituent.
40. The organic electroluminescent element of claim 36 , wherein the carbazole derivative is a compound represented by the following formula 14,
wherein R 1051 through R 1063 independently represent a hydrogen atom or a substituent, provided that at least one of R 1057, R 1058, R 1062, and R 1063 is a substituent.
41. The organic electroluminescent element of claim 36 , wherein the carbazole derivative is a compound represented by the following formula 15,
wherein R 1071 through R 1079 independently represent a hydrogen atom or a substituent, provided that at least one of R 1072 and R 1073 is a substituent; and n is an integer of from 1 to 8.
42. The organic electroluminescent element of claim 1 , wherein the hole transporting layer is formed according to a vacuum deposition process.
43. The organic electroluminescent element of claim 1 , wherein the hole transporting layer is formed according to a wet process.
44. A display comprising the organic electroluminescent element of claim 1 .
45. An illuminator comprising the organic electroluminescent element of claim 1 .
46. A display comprising the illuminator of claim 45 , and a liquid crystal element as a displaying means.
47. The organic electroluminescent element of claim 1 , wherein in Formula 4-1 or 4-2, the substituent of R 801 through R 827 represents an alkyl group, a cycloalkyl group, an alkenyl group, an alkinyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted saturated heterocyclic group, an alkoxy group, a cycloalkoxy group, an aryloxy group, an alkylthio group, a cycloalkylthio group, an arylthio group, an alkoxycarbonyl group, an aryloxycarbonyl group, a sulfamoyl group, an acyl group, an acyloxy group, an amido group, a carbamoyl group, a ureido group, a sulfonyl group, an alkylsulfonyl group or an arylsulfonyl group, an amino group, a halogen atom, a fluorinated hydrocarbon group, a cyano group, a nitro group, a hydroxyl group, a mercapto group, or a silyl group.
48. The organic electroluminescent element of claim 13 , wherein the substituent represented by R 1001 through R 1013 of formula 11 independently represents an alkyl group, a cycloalkyl group, an alkenyl group, an alkinyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted saturated heterocyclic group, an alkoxy group, a cycloalkoxy group, an aryloxy group, an alkylthio group, a cycloalkylthio group, an arylthio group, an alkoxycarbonyl group, an aryloxycarbonyl group, a sulfamoyl group, an acyl group, an acyloxy group, an amido group, a carbamoyl group, a ureido group, a sulfonyl group, an alkylsulfonyl group or an arylsulfonyl group, a halogen atom, a fluorinated hydrocarbon group, a cyano group, a nitro group, a hydroxyl group, a mercapto group, or a silyl group.