Light emitting device

A light emitting device having

• an anode,
• a cathode,
• a first layer containing a compound represented by the formula (C-1), disposed between the anode and the cathode,
• a second layer containing at least one selected from the group consisting of a simple substance composed only of an alkali metal element, a simple substance composed only of a group 2 element, a compound containing an alkali metal element and a compound containing a group 2 element, disposed between the first layer and the cathode, and
• a third layer containing at least one selected from the group consisting of a simple substance composed only of an alkali metal element, a simple substance composed only of a group 2 element, a compound containing an alkali metal element and a compound containing a group 2 element, disposed between the second layer and the cathode in contact with the cathode,
• wherein the at least one selected from the group consisting of a simple substance composed only of an alkali metal element, a simple substance composed only of a group 2 element, a compound containing an alkali metal element and a compound containing a group 2 element contained in the second layer and the at least one selected from the group consisting of a simple substance composed only of an alkali metal element, a simple substance composed only of a group 2 element, a compound containing an alkali metal element and a compound containing a group 2 element contained in the third layer are mutually different:
• wherein,
• Ring R1C, Ring R2C, Ring R3C and Ring R4C each independently represent an aromatic hydrocarbon ring or an aromatic hetero ring, and the foregoing rings optionally have a substituent, and when a plurality of the substituents are present, they may be combined together to form a ring together with the atoms to which they are attached, with the provision that at least one of Ring R1C, Ring R2C, Ring R3C and Ring R4C has an aryl group which optionally has a substituent or a monovalent heterocyclic group which optionally has a substituent as the substituent, and
• RC represents a carbon atom, a silicon atom, a germanium atom, a tin atom or a lead atom.