US2020227653A1PendingUtilityA1

Light-Emitting Element, Light-Emitting Device, Display Device, Electronic Device, and Lighting Device

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Assignee: SEMICONDUCTOR ENERGY LABPriority: May 29, 2015Filed: Mar 3, 2020Published: Jul 16, 2020
Est. expiryMay 29, 2035(~8.9 yrs left)· nominal 20-yr term from priority
Inventors:Shunsuke HosoumiTatsuyoshi TakahashiTakahiro IshisoneSatoshi Seo
H10K 85/657H10K 50/16H10K 50/12H10K 85/6572H10K 71/00H10K 50/11H10K 85/611C07D 491/048C09K 2211/1007C09K 11/025C09K 2211/1048C09K 2211/1051C07D 495/04C09K 11/06F21Y 2115/15H01L 51/0051H01L 51/0072H01L 51/5012H01L 51/0071
62
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Claims

Abstract

A light-emitting element having high emission efficiency is provided. A light-emitting element which has high emission efficiency without using a rare metal as a light-emitting material is provided. A light-emitting element includes a first electrode, a second electrode, and a layer between the first electrode and the second electrode. The layer contains a first organic compound and a second organic compound. The second organic compound has a carbazole skeleton and a substituted or unsubstituted bivalent aromatic hydrocarbon group. The second organic compound further has a benzofuropyrimidine skeleton or a benzothienopyrimidine skeleton. The aromatic hydrocarbon group is bonded to the carbazole skeleton. The aromatic hydrocarbon group is bonded to the benzofuropyrimidine skeleton or the benzothienopyrimidine skeleton. The first organic compound and the second organic compound can form an exciplex.

Claims

exact text as granted — not AI-modified
1 . A light-emitting element comprising:
 a first electrode;   a second electrode;   a hole-transport layer; and   a light-emitting layer between the first electrode and the second electrode,   wherein the light-emitting layer comprises a first organic compound and a second organic compound,   wherein the second organic compound comprises a carbazole skeleton and a substituted or unsubstituted bivalent aromatic hydrocarbon group,   wherein the second organic compound further comprises a benzofuropyrimidine skeleton or a benzothienopyrimidine skeleton,   wherein the aromatic hydrocarbon group is bonded to the carbazole skeleton,   wherein the aromatic hydrocarbon group is bonded to the benzofuropyrimidine skeleton or the benzothienopyrimidine skeleton,   wherein the first organic compound and the second organic compound form an exciplex,   wherein light emission comprises a delayed fluorescence component.   
     
     
         2 . The light-emitting element according to  claim 1 , wherein the second organic compound is an organic compound represented by a structural formula (100) or a structural formula (200), 
       
         
           
           
               
               
           
         
       
     
     
         3 . The light-emitting element according to  claim 1 , wherein a 9-position of the carbazole skeleton is bonded to the aromatic hydrocarbon group. 
     
     
         4 . The light-emitting element according to  claim 1 , wherein the aromatic hydrocarbon group comprises 6 to 60 carbon atoms. 
     
     
         5 . The light-emitting element according to  claim 1 , wherein the aromatic hydrocarbon group comprises 6 to 13 carbon atoms. 
     
     
         6 . The light-emitting element according to  claim 1 , wherein the aromatic hydrocarbon group comprises a biphenyldiyl group. 
     
     
         7 . The light-emitting element according to  claim 6 , wherein the biphenyldiyl group is a 3, 3′-biphenyldiyl group. 
     
     
         8 . The light-emitting element according to  claim 1 , wherein the second organic compound has an electron-transport property and the first organic compound has a hole-transport property. 
     
     
         9 . The light-emitting element according to  claim 1 , wherein the first organic compound is an aromatic amine. 
     
     
         10 . The light-emitting element according to  claim 1 , wherein triplet excitation energy levels of the first organic compound and the second organic compound are higher than a triplet excitation energy level of the exciplex. 
     
     
         11 . The light-emitting element according to  claim 1 , wherein the light-emitting layer comprises a fluorescent substance. 
     
     
         12 . A display device comprising:
 the light-emitting element according to  claim 1  in a display portion; and   a unit configured to control the light-emitting element.   
     
     
         13 . An electronic device comprising:
 the light-emitting element according to  claim 1 ; and   a switch.   
     
     
         14 . A light-emitting element comprising:
 a first electrode;   a second electrode;   a hole-transport layer; and   a light-emitting layer between the first electrode and the second electrode,   wherein the light-emitting layer comprises a first organic compound and a second organic compound,   wherein the second organic compound comprises a carbazole skeleton and a substituted or unsubstituted bivalent aromatic hydrocarbon group,   wherein the second organic compound further comprises a benzofuro[3,2-d]pyrimidine skeleton or a benzothieno[3,2-d]pyrimidine skeleton,   wherein the aromatic hydrocarbon group is bonded to the carbazole skeleton,   wherein the aromatic hydrocarbon group is bonded to the benzofuro[3,2-d]pyrimidine skeleton or the benzothieno[3,2-d]pyrimidine skeleton,   wherein the first organic compound and the second organic compound form an exciplex, and   wherein light emission comprises a delayed fluorescence component.   
     
     
         15 . The light-emitting element according to  claim 14 , wherein a 9-position of the carbazole skeleton is bonded to the aromatic hydrocarbon group. 
     
     
         16 . The light-emitting element according to  claim 14 , wherein the aromatic hydrocarbon group comprises 6 to 60 carbon atoms. 
     
     
         17 . The light-emitting element according to  claim 14 , wherein the aromatic hydrocarbon group comprises 6 to 13 carbon atoms. 
     
     
         18 . The light-emitting element according to  claim 14 , wherein the aromatic hydrocarbon group comprises a biphenyldiyl group. 
     
     
         19 . The light-emitting element according to  claim 18 , wherein the biphenyldiyl group is a 3, 3′-biphenyldiyl group. 
     
     
         20 . The light-emitting element according to  claim 14 , wherein the second organic compound has an electron-transport property and the first organic compound has a hole-transport property. 
     
     
         21 . The light-emitting element according to  claim 14 , wherein the first organic compound is an aromatic amine. 
     
     
         22 . The light-emitting element according to  claim 14 , wherein triplet excitation energy levels of the first organic compound and the second organic compound are higher than a triplet excitation energy level of the exciplex. 
     
     
         23 . The light-emitting element according to  claim 14 , wherein the light-emitting layer comprises a fluorescent substance. 
     
     
         24 . A display device comprising:
 the light-emitting element according to  claim 14  in a display portion; and   a unit configured to control the light-emitting element.   
     
     
         25 . An electronic device comprising:
 the light-emitting element according to  claim 14 ; and   a switch.   
     
     
         26 . The light-emitting element according to  claim 14 , wherein a 4-position of the benzofuro[3,2-d]pyrimidine skeleton or the benzothieno[3,2-d]pyrimidine skeleton is bonded to the aromatic hydrocarbon group. 
     
     
         27 . The light-emitting element according to  claim 14 , wherein a 4-position of the benzofuro[3,2-d]pyrimidine skeleton or the benzothieno[3,2-d]pyrimidine skeleton is bonded to the aromatic hydrocarbon group while the other positions are unsubstituted.

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