The present invention relates to a novel organic compound and applications thereof, and an organic electroluminescent device using the compound, wherein the compound has a structure represented by thefollowing formula defined in the specification, wherein Y<1>, Y<2> and Y<3> are respectively and independently selected from H and B, at most one of Y<1>, Y<2> and Y<3> is H, X<1>, X<2> and X<3> arerespectively and independently selected from N and H, at most one of X<1>, X<2> and X<3> is H, X<4>, X<5> and X<6> are respectively and independently selected from H, a single bond, O, S and CR, R<1>-R<18> are respectively and independently selected from hydrogen, deuterium, substituted or unsubstituted C1-C36 alkyl, substituted or unsubstituted C6-C48 monocyclic aromatic hydrocarbon or fused ringaromatic hydrocarbon, and substituted or unsubstituted C3-C48 monocyclic heteroaromatic hydrocarbon or fused ring heteroaromatic hydrocarbon, and the two adjacent groups in R<1>-R<18> can be bonded to form C1-C10 cycloalkane, C6-C30 aromatic hydrocarbon or C5-C30 heteroaromatic hydrocarbon. According to the present invention, with the application of the compound as the light emitting layer material in an OLED device, the compound exhibits excellent device performance and excellent stability. The present invention further discloses an organic electroluminescent device using the compound represented by the general formula.