Organic electronic devices using phthalimide compounds
Organic electronic devices comprising a phthalimide compound. The phthalimide compounds disclosed herein are electron transporters with large HOMO-LUMO gaps, high triplet energies, large reduction potentials, and/or thermal and chemical stability. As such, these phthalimide compounds are suitable for use in any of various organic electronic devices, such as OLEDs and solar cells. In an OLED, the phthalimide compounds may serve various functions, such as a host in the emissive layer, as a hole blocking material, or as an electron transport material. In a solar cell, the phthalimide compounds may serve various functions, such as an exciton blocking material. Various examples of phthalimide compounds which may be suitable for use in the present invention are disclosed.
1. An organic light-emitting device comprising:
an anode;
a cathode; and
an emissive layer disposed between the anode and the cathode, wherein the emissive layer comprises a phosphorescent dopant and a phthalimide compound as a host having the formula:
wherein R 1 represents one or more independently selected substitutions located on any position of the ring, wherein each substitution is a hydrogen, an alkyl moiety containing up to fifteen carbon atoms, or an aryl moiety, and
wherein R is represented by one of the following formula:
wherein R 2 , R 3 , R 4 , R 7 , and R 9 each represents one or more independently selected substitutions located on any position of the ring, wherein each substitution is hydrogen, an alkyl moiety containing up to fifteen carbon atoms, or an aryl moiety,
wherein R 5 and R 8 each represents a substitution located on any position of the ring, wherein R 5 and R 8 is represented by the formula:
2. The device of claim 1 , wherein R is represented by the formula:
3. The device of claim 2 , wherein each R 3 is selected from the group consisting of hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, and tert-butyl.
4. The device of claim 2 , wherein each R 2 is selected from the group consisting of hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, and tert-butyl.
5. The device of claim 2 , wherein each R 3 is selected from the group consisting of hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, phenyl, naphthyl, biphenyl, and phenanthryl.
6. The device of claim 2 , wherein each R 2 is selected from the group consisting of hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, phenyl, naphthyl, biphenyl, and phenanthryl.
7. The device of claim 2 , wherein the two phthalimide groups are in para position on the phenyl ring.
8. The device of claim 1 , wherein each R 1 is selected from the group consisting of hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, and tert-butyl.
9. The device of claim 1 , wherein each R 1 is selected from the group consisting of hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, phenyl, naphthyl, biphenyl, and phenanthryl.
10. The device of claim 1 , wherein R is represented by the formula:
11. The device of claim 10 , wherein the two phthalimide groups are in ortho position on the cyclohexane ring.
12. The device of claim 10 , wherein each R 4 is independently selected from the group consisting of hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, and tert-butyl.
13. The device of claim 10 , wherein each R 6 is independently selected from the group consisting of hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, and tert-butyl.
14. The device of claim 10 , wherein each R 4 is independently selected from the group consisting of hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, phenyl, naphthyl, biphenyl, and phenanthryl.
15. The device of claim 10 , wherein each R 6 is independently selected from the group consisting of hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, phenyl, naphthyl, biphenyl, and phenanthryl.
16. The device of claim 1 , wherein R is represented by the formula:
17. The device of claim 16 , wherein each R 7 is independently selected from the group consisting of: hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, and tert-butyl.
18. The device of claim 16 , wherein each R 7 is independently selected from the group consisting of: hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, phenyl, naphthyl, biphenyl, and phenanthryl.
19. The device of claim 1 , wherein R is represented by the formula:
20. The device of claim 19 , wherein each R 9 is hydrogen.
21. The device of claim 1 , wherein the phthalimide compound is a bis-phthalimide.
22. The device of claim 1 , wherein the phthalimide compound is selected from the group consisting of:
23. The device of claim 1 , wherein the phthalimide compound is selected from the group consisting of: