Patent claim: The compound of claim 11 wherein the compound is Compound x having theformula IrLAj2LBk wherein x227jk227 j is an integer from 1 to 225 and k is an integer from 1 to 227 wherein LB1 to LB227 has the following structures

Related passage: In particular it is confirmed that when a compound of Chemical Formula 14 was selected as a dopant and compounds of Chemical Formula 8 and 10 Chemical Formula 11 to 12 and Chemical Formula 3 to 5 were selected as a host more efficient luminous properties are revealed to obtain a highperformance organic electroluminescent device with high efficiency and long life property.wherein R represents substituted or unsubstituted C1C30alkyl substituted or unsubstituted C6C30aryl L1 is selected from the following structures andthe R201 through R203 independently represent hydrogen deuterium halogensubstituted or unsubstituted C1C30alkyl C1C30alkylsubstituted or unsubstituted C6C30aryl or halogen R204 through R219 independently represent hydrogen deuterium substituted or unsubstituted C1C30alkyl substituted or unsubstituted C6C30aryl SF5 substituted or unsubstituted triC1C30alkylsilyl substituted or unsubstituted diC1C30alkylC6C30arylsilyl substituted or unsubstituted triC6C30arylsilyl cyano or halogen R220 through R221 independently represent hydrogen deuterium halogensubstituted or unsubstituted C1C30alkyl or C1C30alkylsubstituted or unsubstituted C6C30aryl and n and m independently represent an integer of 1 to 3.wherein Z represents O S CR41R42 NR45 Y11 through Y12 represent C Y13 represents NR45 R31 and R32 independently represent hydrogen deuterium halogen substituted or unsubstituted C1C30alkyl substituted or unsubstituted C6C30aryl substituted or unsubstituted C3C30heteroaryl substituted C1C30alkylsilyl group substituted or unsubstituted C1C30arylsilyl group and substituted or unsubstituted C1C30alkylC6C30arylsilyl group the R41 through R42 independently represent substituted or unsubstituted C1C30alkyl substituted or unsubstituted C6C30aryl and substituted or unsubstituted C3C30heteroarylthe R45 represents unsubstituted C1C30alkyl substituted or unsubstituted C6C30aryl and substituted or unsubstituted C3C30heteroaryl p and q independently represent an integer of 0 through 4 when p or q represent an integer larger than 2 each R31 and R32 may be the same or different from each other.Chemical Formula 3CzL2aMChemical Formula 4CzbL2Mwherein Cz has a following structureR52 through R53 independently represent hydrogen deuterium halogen substituted or unsubstituted C1C30alkyl substituted or unsubstituted C6C30aryl substituted or unsubstituted C3C30heteroaryl R17R18R19Si R17 through R19 independently represent substituted or unsubstituted C1C30alkyl substituted or unsubstituted C6C30aryl each R52 or R53 may be the same or different from each other L2 represents a chemical bond substituted or unsubstituted C6C30arylene and substituted or unsubstituted C5C30heteroarylene M represents substituted or unsubstituted C6C30aryl group and substituted or unsubstituted C5C30heteroaryl a through d independently represent an integer of 0 through 4.wherein A1 through A14 represent CR61 A15 through A19 independently represent CR61 or N X represents NR64 S O and SiR65R66 Ar1 represents substituted or unsubstituted C6C40arylene and substituted or unsubstituted C3C40heteroarylene except for the case that e0 and A15 through A19 represent CR61 at the same time R61 and R64 through R66 independently represent hydrogen deuterium halogen substituted or unsubstituted C1C30alkyl substituted or unsubstituted C6C30aryl substituted or unsubstituted C3C30heteroaryl NR71R72 and R79R80R81Si the R71 through R72 independently represent substituted or unsubstituted C1C30alkyl substituted or unsubstituted C6C30aryl or substituted or unsubstituted C3C30heteroaryl and the R79 through R81 independently represent substituted or unsubstituted C1C30alkyl or substituted or unsubstituted C6C30aryl and e represents an integer of 0 through 2.The organic electroluminescent compound of Chemical Formula 1 may be exemplified by the following compounds which are not intended to limit the present invention.