Pt complexes as phosphorescent emitters in the fabrication of organic light emitting diodes
View Patent ↗A series of Pt(II) complexes having the following formula are disclosed: X 1 and X 2 independently are C or N, X 1 can also locate at another position of the hexagonal ring, when X 1 is N; R 1 is H, C1–C8 alkyl, or C1–C4 perfluoroalkyl, R 2 is H, R 1 and R 2 together are C4–C8 alkylene, or R 1 and R 2 together are bridged carbocyclic C4–C12 alkylene, when X 2 is C; R 1 is H, C1–C8 alkyl, or C1–C4 perfluoroalkyl, and R 2 is omitted, when X 2 is N; R 7 is H or methyl, and R 8 is omitted, when X 1 is N; R 7 is H or methyl, R 8 is H or methyl, or R 7 and R 8 together are when X 1 is C.
1. A Pt(II) complex having the following formula:
wherein
X 1 and X 2 independently are C or N;
R 1 is H, C1–C8 alky, or C1–C4 perfluoroalkyl, R 2 is H, or R 1 and R 2 together are C4–C8 alkylene, or R 1 and R 2 together are bridged carbocyclic C4–C12 alkylene, when X 2 is C;
R 1 is H, C1–C8 alkyl, or C1–C4 perfluoroalkyl, and R 2 is omitted, when X 2 is N;
R 7 is H or methyl, R 8 is H or methyl, or R 7 and R 8 together are
when X 1 is C;
R 7 is H or methyl, and R 8 is omitted, when X 1 is N.
2. The Pt(II) complex as defined in claim 1 , wherein X 1 is C, and R 7 and R 8 together are
3. The Pt(II) complex as defined in claim 2 , wherein X 2 is C.
4. The Pt(II) complex as defined in claim 3 , wherein R 1 and R 2 together are bridged carbocyclic C4–C12 alkylene.
5. The Pt(II) complex as defined in claim 4 , wherein R 1 and R 2 together are
wherein R 4 , R 5 and R 6 independently are C1–C4 alkyl.
6. The Pt(II) complex as defined in claim 5 , wherein R 4 , R 5 and R 6 are methyl.
7. The Pt(II) complex as defined in claim 3 , wherein R 1 is C1–C8 alkyl, or C1–C4 perfluoroalkyl, and R 2 is hydrogen.
8. The Pt(II) complex as defined in claim 2 , wherein X 2 is N, R 1 is C1–C8 alkyl, or C1–C4 perfluoroalkyl, and R 2 is omitted.
9. The Pt(II) complex as defined in claim 1 , wherein X 1 is C, R 7 is H or methyl, and R 8 is H.
10. The Pt(II) complex as defined in claim 9 , wherein X 2 is C.
11. The Pt(II) complex as defined in claim 10 , wherein R 1 and R 2 together are bridged carbocyclic C4–C12 alkylene.
12. The Pt(II) complex as defined in claim 11 , wherein R 1 and R 2 together are
are wherein R 4 , R 5 and R 6 independently are C1–C4 alkyl.
13. The Pt(II) complex as defined in claim 12 , wherein R 4 , R 5 and R 6 are methyl.
14. The Pt(II) complex as defined in claim 10 , wherein R 1 is C1–C8 alkyl, or C1–C4 perfluoroalkyl, and R 2 is hydrogen.
15. The Pt(II) complex as defined in claim 10 , wherein R 1 and R 2 together are C4–C8 alkylene.
16. The Pt(II) complex as defined in claim 10 , wherein R 1 and R 2 together are tetramethylene.
17. The Pt(II) complex as defined in claim 9 , wherein X 2 is N, R 1 is C1–C8 alkyl, or C1–C4 perfluoroalkyl, and R 2 is omitted.
18. The Pt(II) complex as defined in claim 1 , wherein X 1 is N, R 7 is H or methyl, and R 8 is omitted.
19. The Pt(II) complex as defined in claim 18 , wherein X 2 is C.
20. The Pt(II) complex as defined in claim 19 , wherein R 1 and R 2 together are bridged carbocyclic C4–C12 alkylene.
21. The Pt(II) complex as defined in claim 20 , wherein R 1 and R 2 together are
are wherein R 4 , R 5 and R 6 independently are C1–C4 alkyl.
22. The Pt(II) complex as defined in claim 21 , wherein R 4 , R 5 and R 6 are methyl.
23. The Pt(II) complex as defined in claim 19 , wherein R 1 is C1–C8 alkyl, or C1–C4 perfluoroalkyl, and R 2 is hydrogen.
24. The Pt(II) complex as defined in claim 19 , wherein R 1 and R 2 together are C4–C8 alkylene.
25. The Pt(II) complex as defined in claim 24 , wherein R 1 and R 2 together are tetramethylene.
26. The Pt(II) complex as defined in claim 18 , wherein X 2 is N, R 1 is C1–C8 alkyl, or C1–C4 perfluoroalkyl, and R 2 is omitted.