Light-emitting compound and organic light-emitting diodes using the same

An organic light emitting compound is provided to ensure excellent electrical characteristics and electroluminescent characteristics, and to be useful as a host material of a light emitting layer or a material for forming a hole transport layer or electron block layer. An organic light emitting compound has a structure represented by the following formula 1, wherein Y is carbon or silicon, X1 and X2 are a divalent linker, are identical to or different from each other, and are C6-18 substituted or unsubstituted arylene, or C4-18 substituted or unsubstituted heteroarylene, R1 and R2 are identical to or different from each other and are hydrogen, C1-8 substituted or unsubstituted alkyl groups, C6-24 substituted or unsubstituted aryl groups, or C4-24 substituted or unsubstituted heteroaryl groups, with the proviso that both R1 and R2 are not hydrogen, Ar1, Ar2, Ar3, and Ar4 are identical to or different from one another and are C6-24 substituted or unsubstituted aryl groups or C4-24 substituted or unsubstituted heteroaryl groups, and at least one of R1 and R2, R1 and X1, R1 and X2, or X1 and Ar1 is linked with each other to form a fused ring.