| CPC H10K 85/636 (2023.02) [C07F 5/027 (2013.01); C09K 11/06 (2013.01); H10K 85/626 (2023.02); H10K 85/633 (2023.02); H10K 85/6572 (2023.02); H10K 85/6574 (2023.02); H10K 85/6576 (2023.02); C09K 2211/1007 (2013.01); C09K 2211/1018 (2013.01); H10K 50/11 (2023.02); H10K 50/15 (2023.02); H10K 50/16 (2023.02); H10K 50/17 (2023.02); H10K 50/171 (2023.02); H10K 50/18 (2023.02)] | 17 Claims |
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1. An organic electroluminescent compound represented by Formula A-5 or A-7:
 wherein X is selected from B, P, and P═O,
the moieties Y1 and Y2 are identical to or different from each other and are each independently selected from NR1, CR2R3, O, S, Se, and SiR4R5, with the proviso that the two Y1 moieties are not simultaneously NR1 (wherein R1 to R5 are identical to or different from each other and are each independently selected from hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C6-C50 aryl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C2-C50 heteroaryl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C1-C30 alkylthioxy, substituted or unsubstituted C5-C30 arylthioxy, substituted or unsubstituted C1-C30 alkylamine, substituted or unsubstituted C5-C30 arylamine, substituted or unsubstituted C1-C30 alkylsilyl, substituted or unsubstituted C5-C30 arylsilyl, substituted or unsubstituted C3-C20 mixed aliphatic-aromatic cyclic group, nitro, cyano, and halogen, with the proviso that R2 and R3 are optionally linked to each other to form an alicyclic or aromatic monocyclic or polycyclic ring and R4 and R5 are optionally linked to each other to form an alicyclic or aromatic monocyclic or polycyclic ring), and
the moieties Z are identical to or different from each other and are each independently CR or N (wherein R is selected from hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C6-C50 aryl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C2-C50 heteroaryl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C1-C30 alkylthioxy, substituted or unsubstituted C5-C30 arylthioxy, substituted or unsubstituted C1-C30 alkylamine, substituted or unsubstituted C5-C30 arylamine, substituted or unsubstituted C1-C30 alkylsilyl, substituted or unsubstituted C5-C30 arylsilyl, substituted or unsubstituted C3-C20 mixed aliphatic-aromatic cyclic group, nitro, cyano, and halogen), with the proviso that R1 is optionally linked to R of the adjacent Z moiety through O, S, CR6R7 or a single bond to form an alicyclic or aromatic monocyclic or polycyclic ring in which some or all of the carbon atoms are optionally substituted with heteroatoms selected from N, S, and O (wherein R6 and R7 are each independently selected from hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C6-C50 aryl, and substituted or unsubstituted C3-C30 cycloalkyl, and substituted or unsubstituted C2-C50 heteroaryl) and with the proviso that the plurality of R groups are optionally bonded to each other to form an alicyclic or aromatic monocyclic or polycyclic ring in which some or all of the carbon atoms are optionally substituted with heteroatoms selected from N, S, and O; or
 wherein X, Y1, Y2, and Z are as defined in Formula A-5, with the proviso that the two Y1 moieties are optionally simultaneously NR1.
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4. An organic electroluminescent device comprising a first electrode, a second electrode opposite to the first electrode, and one or more organic layers interposed between the first and second electrodes wherein at least one of the organic layers comprises the organic electroluminescent compound represented by Formula A-5 or A-7 according to claim 1.
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