A light emitting device comprising an anode, an emissive layer, an electron transporting layer and a cathode that are provided as {HEAD ~ layers} in turn, the device emits light by electrical energy and said electron transporting layer comprises at least one type of compound comprising a plurality of 1,7 phenanthroline skeletal structures or {TAIL ~ a plurality} of benzoquinoline skeletal structures, wherein said plurality of 1,7 phenanthroline skeletal structures or a plurality of benzoquinoline skeletal structures are connected by conjugated bonds, an aromatic hydrocarbon, an aromatic heterocycle or combinations thereof 
A light emitting device comprising an anode , an emissive layer , an electron transporting layer and a cathode that are provided as { HEAD ~ layers } in turn , the device emits light by electrical energy and said electron transporting layer comprises at least one type of compound comprising a plurality of 1,7 phenanthroline skeletal structures or { TAIL ~ a plurality } of benzoquinoline skeletal structures , wherein said plurality of 1,7 phenanthroline skeletal structures or a plurality of benzoquinoline skeletal structures are connected by conjugated bonds , an aromatic hydrocarbon , an aromatic heterocycle or combinations thereof
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