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