Composite Material, Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device

Abstract

A composite material including an organic compound and an inorganic compound and having a high carrier-transport property is provided. A composite material having a high carrier-injection property to an organic compound is provided. A composite material in which light absorption due to charge transfer interaction is unlikely to occur is provided. A light-emitting element having high emission efficiency is provided by including the composite material. A light-emitting element having a low drive voltage is provided. A light-emitting element having a long lifetime is provided. A composite material including a heterocyclic compound having a dibenzothiophene skeleton or a dibenzofuran skeleton and an inorganic compound exhibiting an electron-accepting property with respect to the heterocyclic compound is provided.

1 . A composite material comprising:
 a molybdenum oxide; and   a heterocyclic compound in which a substituent having 6 to 70 carbon atoms is bonded to a 4-position of a dibenzothiophene skeleton or a dibenzofuran skeleton,   wherein a highest occupied molecular orbital level of the heterocyclic compound is lower than or equal to −5.7 eV when measured by photoelectron spectrometry.   
     
     
         2 . The composite material according to  claim 1 , wherein a ring of the substituent is at least one selected from the group consisting of a benzene ring, a naphthalene ring, a phenanthrene ring, a triphenylene ring, a fluorene ring, a dibenzothiophene ring, and a dibenzofuran ring. 
     
     
         3 . The composite material according to  claim 1 , wherein the heterocyclic compound and the molybdenum oxide are mixed with each other. 
     
     
         4 . A light-emitting element comprising the composite material according to  claim 1 , between a pair of electrodes. 
     
     
         5 . The light-emitting element according to  claim 4 , wherein the composite material is in contact with an anode of the pair of electrodes. 
     
     
         6 . The light-emitting element according to  claim 4 , wherein the composite material is in contact with a cathode of the pair of electrodes. 
     
     
         7 . The light-emitting element according to  claim 4 , wherein the composite material is in contact with an anode and a cathode of the pair of electrodes. 
     
     
         8 . A light-emitting device comprising the light-emitting element according to  claim 4 . 
     
     
         9 . An electronic device comprising the light-emitting device according to claim  8 . 
     
     
         10 . Alighting device comprising the light-emitting device according to  claim 8 . 
     
     
         11 . A composite material comprising:
 a molybdenum oxide; and   a heterocyclic compound in which a phenyl group is bonded to a 4-position of a dibenzothiophene skeleton or a dibenzofuran skeleton,   wherein the phenyl group has one or more substituents,   wherein the phenyl group and the one or more substituents have a total of 12 to 70 carbon atoms, and   wherein a highest occupied molecular orbital level of the heterocyclic compound is lower than or equal to −5.7 eV when measured by photoelectron spectrometry.   
     
     
         12 . The composite material according to  claim 11 , wherein a ring of the one or more substituents is at least one selected from the group consisting of a benzene ring, a naphthalene ring, a phenanthrene ring, a triphenylene ring, a fluorene ring, a dibenzothiophene ring, and a dibenzofuran ring. 
     
     
         13 . The composite material according to  claim 11 , wherein the heterocyclic compound and the molybdenum oxide are mixed with each other. 
     
     
         14 . A light-emitting element comprising the composite material according to  claim 11 , between a pair of electrodes. 
     
     
         15 . The light-emitting element according to  claim 14 , wherein the composite material is in contact with an anode of the pair of electrodes. 
     
     
         16 . The light-emitting element according to  claim 14 , wherein the composite material is in contact with a cathode of the pair of electrodes. 
     
     
         17 . The light-emitting element according to  claim 14 , wherein the composite material is in contact with an anode and a cathode of the pair of electrodes. 
     
     
         18 . A light-emitting device comprising the light-emitting element according to  claim 14 . 
     
     
         19 . An electronic device comprising the light-emitting device according to  claim 18 . 
     
     
         20 . Alighting device comprising the light-emitting device according to  claim 18 .