Borazine derivatives
Borazine derivatives are used in the manufacture of electronic devices, in particular electroluminescent and semiconductor devices. More specifically, stable borazine derivatives include boron atoms substituted by aryl groups used in one or more layers of an electroluminescent or a semiconductor device, in particular in the emissive layer of organic light-emitting devices (OLED).
1. A borazine derivative represented by the following formula:
wherein the substituents R 4 to R 18 are the same or different from each other;
wherein each of R 4 to R 18 is independently selected from the group consisting of: hydrogen; linear or branched saturated alkyl group; linear or branched unsaturated alkyl group; cycloalkyl group; aryl group; aralkyl group; heteroaryl group; acyl group; hydroxyl; alkoxy group; aryloxy group; acyloxy group; amino group; alkylamino group; arylamino group; acylamino group; cyano group; carboxyl group; thio group; aminocarbonyl group; carbamoyl group, aryloxycarbonyl group, phenoxycarbonyl group, alkoxycarbonyl group and halogen;
wherein R 4 , R 8 , R 9 , R 13 , R 14 and R 18 cannot simultaneously be selected to be hydrogen;
wherein R 4 to R 8 and R 14 to R 18 cannot simultaneously be selected to be fluorine;
wherein the substituents R 19 to R 27 are the same or different from each other;
wherein each of R 19 to R 27 is independently selected from the group consisting of:
hydrogen; linear or branched saturated alkyl group; linear or branched unsaturated alkyl group; cycloalkyl group; aryl group; aralkyl group; heteroaryl group; acyl group; hydroxyl; alkoxy group; aryloxy group; acyloxy group; amino group; alkylamino group; arylamino group; acylamino group; cyano group; carboxyl group; thio group; aminocarbonyl group; carbamoyl group, aryloxycarbonyl group, phenoxycarbonyl group, alkoxycarbonyl group and halogen;
wherein at least one substituent selected from the group of R 6 , R 11 and R 16 is independently selected from the group consisting of linear or branched saturated alkyl groups; and
wherein at least two substituents selected from the group of R 4 , R 8 , R 9 , R 13 , R 14 and R 18 are independently selected from the group consisting of linear saturated alkyl groups and branched saturated alkyl groups.
2. A derivative according to claim 1 , wherein at least one substituent selected from the group of R 22 , R 23 , R 24 , R 25 , R 26 and R 27 is independently selected to be hydrogen.
3. A derivative according to claim 1 , wherein at least one substituent selected from the group of R 19 , R 20 and R 21 is independently selected from the group consisting of hydrogen, and linear or branched saturated alkyl groups.
4. A derivative according to claim 1 , able to emit in the UV region with a quantum yield above 0.05.
5. A derivative according to claim 1 , wherein at least one substituent selected from the group of R 6 , R 11 and R 16 is independently selected from the group consisting of linear or branched saturated alkyl groups with 1 to 6 carbon atoms.
6. A derivative according to claim 1 , wherein at least one substituent selected from the group of R 6 , R 11 and R 16 is independently selected from the group consisting of linear or branched saturated alkyl groups with 1 to 4 carbon atoms.
7. A derivative according to claim 1 , wherein at least one substituent selected from the group of R 6 , R 11 and R 16 is independently selected from the group consisting of linear or branched saturated alkyl groups with 1 to 3 carbon atoms.
8. A derivative according to claim 1 , wherein at least two substituents selected from the group of R 4 , R 8 , R 9 , R 13 , R 14 and R 18 are independently selected from the group consisting of linear or branched saturated alkyl groups with 1 to 6 carbon atoms.
9. A derivative according to claim 1 , wherein at least two substituents selected from the group of R 4 , R 8 , R 9 , R 13 , R 14 and R 18 are independently selected from the group consisting of linear or branched saturated alkyl groups with 1 to 4 carbon atoms.
10. A derivative according to claim 1 , wherein at least two substituents selected from the group of R 4 , R 8 , R 9 , R 13 , R 14 and R 18 are independently selected from the group consisting of linear or branched saturated alkyl groups with 1 to 3 carbon atoms.
11. A derivative according to claim 3 , wherein at least one substituent selected from the group of R 19 , R 20 and R 21 is independently selected from the group consisting of hydrogen, and linear or branched saturated alkyl groups with 1 to 12 carbon atoms.
12. A derivative according to claim 3 , wherein at least one substituent selected from the group of R 19 , R 20 and R 21 is independently selected from the group consisting of hydrogen, and linear or branched saturated alkyl groups with 1 to 6 carbon atoms.
13. A derivative according to claim 3 , wherein at least one substituent selected from the group of R 19 , R 20 and R 21 is independently selected from the group consisting of hydrogen, and linear or branched saturated alkyl groups with 1 to 3 carbon atoms.