Composite material, light-emitting element, light-emitting device, electronic device, and lighting device
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 light-emitting element comprising:
a pair of electrodes;
a light-emitting layer between the pair of electrodes; and
a layer including a composite material between the light-emitting layer and one of the pair of electrodes,
wherein the composite material comprising:
a heterocyclic compound represented by a general formula (G1):
and
a transition metal oxide,
wherein the transition metal oxide is molybdenum oxide,
wherein A represents sulfur,
wherein R 1 to R 7 separately represent one of hydrogen, an alkyl group comprising 1 to 4 carbon atoms, and an aryl group comprising 6 to 25 carbon atoms in a ring,
wherein R 8 , R 9 , R 11 and R 12 represent hydrogen, and
wherein R 10 represents a substituted or unsubstituted fluorenyl group.
2. A light-emitting element comprising:
a pair of electrodes;
a light-emitting layer between the pair of electrodes; and
a layer including a composite material between the light-emitting layer and one of the pair of electrodes,
wherein the composite material comprising:
a heterocyclic compound represented by a general formula (G1):
and
a transition metal oxide,
wherein the transition metal oxide is vanadium oxide or molybdenum oxide,
wherein A represents one of oxygen and sulfur,
wherein R 1 to R 7 separately represent one of hydrogen, an alkyl group comprising 1 to 4 carbon atoms, and an aryl group comprising 6 to 25 carbon atoms in a ring,
wherein R 8 , R 9 , R 11 and R 12 represent hydrogen, and
wherein R 10 represents a substituted or unsubstituted fluorenyl group.
3. The light-emitting element according to claim 1 or 2 , wherein the heterocyclic compound has a dibenzothiophene skeleton.
4. The light-emitting element according to claim 1 or 2 , wherein the layer is in contact with the one of the pair of electrodes.
5. The light-emitting element according to claim 1 or 2 , further comprising:
a second light-emitting layer between the other of the pair of electrodes and the light-emitting layer; and
a second layer including the composite material between the light-emitting layer and the second light-emitting layer.
6. The light-emitting element according to claim 1 or 2 , wherein the heterocyclic compound and the transition metal oxide are mixed.
7. A light-emitting device comprising the light-emitting element according to claim 1 or 2 .
8. The light-emitting element according to claim 1 or 2 , wherein an absorption of the composite material at the visible light region is lower than that of the heterocyclic compound.