Delayed fluorescence compound for organic EL device and using the same

Patent metadata

Field	Value
Publication number	US-10224488-B2
Application number	US-201615390720-A
Country	US
Kind code	B2
Filing date	Dec 27, 2016
Priority date	Dec 27, 2016
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

Abstract

The present invention discloses a delayed fluorescence compound and the organic EL device employing the delayed fluorescence compound as light emitting host of emitting lay and/or an electron transporting layer, and/or a hole blocking layer, and/or a delayed fluorescence material of emitting layer for organic EL device in the present invention display good performance.

First claim

The invention claimed is:

1. A delayed fluorescence compound is represented by the following formula (1) or formula (2):

where D 1 and D 2 are independently selected from the group consisting of formula (3) to formula (5):

L 1 and L 2 represent a single bond, a substituted or unsubstituted arylene group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heterarylene group having 3 to 30 ring carbon atoms, X independently represents an oxygen atom, a sulfur atom or a selenium atom, p represents an integer of 0 to 4, Z is a divalent bridge selected from the atom or group consisting from O, S, C(R 7 )(R 8 ), NR 9 and Si(R 10 )(R 11 ) if the delayed fluorescence compound is represented by the formula (2), Z is a divalent bridge selected from the atom or group consisting from C(R 7 )(R 8 ) and Si(R 10 )(R 11 ) if the delayed fluorescence compound is represented by the formula (1), Y 1 to Y 6 represent a nitrogen atom or C(R s ), and each R s represents a hydrogen, a phenyl, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms; R 1 to R 12 are independently selected from the group consisting of a hydrogen atom, a halide, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 30 carbon atoms and a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms.

2. The delayed fluorescence compound according to claim 1 , wherein L 1 and L 2 are represented by the following formula (6):

wherein Z 1 to Z 5 independently represent a nitrogen atom or C(R s ), and each R s represents a hydrogen, a phenyl, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms and a substituted or unsubstituted aryl group having 6 to 30 carbon atoms.

3. The delayed fluorescence compound according to claim 1 , wherein a difference between a singlet energy of the delayed fluorescence compound and a triplet energy of the delayed fluorescence compound is less than 0.25 eV.

4. The delayed fluorescence compound according to claim 1 , the compound having structure of formula (1) or formula (2) is a light-emitting material.

5. The light-emitting material according to claim 4 , wherein the light-emitting material emits delayed fluorescence.

6. A organic electroluminescence device comprising a pair of electrodes consisting of a cathode and an anode, and between the pairs of electrodes comprises at least a light emitting layer and one or more layers of organic thin film layer, wherein the light emitting layer or/and organic thin film layer comprises a delayed fluorescence compound with a general formula (1) or formula (2) according to claim 1 .

7. The organic electroluminescence device according to claim 6 , wherein a difference between a singlet energy of the delayed fluorescence compound and a triplet energy of the delayed fluorescence compound is less than 0.25 eV.

8. The organic electroluminescence device according to claim 6 , wherein the light emitting layer comprises the delayed fluorescence compound and/or fluorescence compound.

9. The organic electroluminescence device according to claim 6 , wherein the light emitting layer comprises the delayed fluorescence compound with a general formula (1) or formula (2) as a delayed fluorescence host material.

10. The organic electroluminescence device according to claim 6 , wherein the light emitting layer comprises the delayed fluorescence compound with a general formula (1) or formula (2) as a delayed fluorescence dopant material.

11. The organic electroluminescence device according to claim 6 , wherein the light emitting layer comprises a second fluorescence dopant material.

12. The organic electroluminescence device according to claim 6 , wherein the light emitting layer comprises a second fluorescence host material.

13. The organic electroluminescence device according to claim 6 , wherein the light emitting layer comprises the delayed fluorescence compound with a general formula (1) or formula (2) as a phosphorescent host material.

14. The organic electroluminescence device according to claim 6 , wherein the organic thin film layer comprises the delayed fluorescence compound with a general formula (1) or formula (2) as a hole blocking material.

15. The organic electroluminescence device according to claim 6 , wherein the organic thin film layer comprises the delayed fluorescence compound with a general formula (1) or formula (2) as an electron transporting layer (ETL) material.

16. The organic electroluminescence device according to claim 6 , wherein the device is an organic light emitting device.

17. The organic electroluminescent device according to claim 6 , wherein the device is a lighting panel.

18. The organic electroluminescent device according to claim 6 , wherein the device is a backlight panel.

Assignees

• Yen Feng Wen
• Hsiao Wen Feng
• Teng Chin Min

Inventors

• Yen Feng-Wen
• Hsiao Wen-Feng
• Teng Chin-Min

Classifications

• C09K2211/1096

  containing other heteroatoms · CPC title

• C09K2211/1092

  containing sulfur as the only heteroatom · CPC title

• C09K2211/1088

  containing oxygen as the only heteroatom · CPC title

• C09K2211/1051

  with sulfur · CPC title

• C09K2211/1048

  with oxygen · CPC title