US 12,279,516 B2
Organic electroluminescent materials and devices
Wei-Chun Shih, Lawrenceville, NJ (US); Zhiqiang Ji, Chalfont, PA (US); and Pierre-Luc T. Boudreault, Pennington, NJ (US)
Assigned to UNIVERSAL DISPLAY CORPORATION, Ewing, NJ (US)
Filed by Universal Display Corporation, Ewing, NJ (US)
Filed on May 18, 2021, as Appl. No. 17/323,521.
Claims priority of provisional application 63/040,169, filed on Jun. 17, 2020.
Prior Publication US 2022/0013735 A1, Jan. 13, 2022
Int. Cl. H01L 51/00 (2006.01); C07F 15/00 (2006.01); C09K 11/06 (2006.01); H10K 85/30 (2023.01); H10K 50/11 (2023.01); H10K 101/10 (2023.01)
CPC H10K 85/342 (2023.02) [C07F 15/0033 (2013.01); C09K 11/06 (2013.01); C09K 2211/1044 (2013.01); C09K 2211/185 (2013.01); H10K 50/11 (2023.02); H10K 2101/10 (2023.02)] 20 Claims
 
1. A compound of formula Ir(LA)2LC;
wherein:
each ligand LA can be the same or different and has Formula I

OG Complex Work Unit Chemistry
each LA is coordinated to Ir to give a 5-membered chelate;
A1 is a multicyclic fused ring system comprising two or more fused 5-membered or 6-membered carbocyclic or heterocyclic rings;
A2 is a 5-membered heterocyclic ring or a multicyclic fused ring system comprising at least one 5-membered heterocyclic ring which is coordinated to Ir and one or more 5-membered or 6-membered carbocyclic or heterocyclic rings;
with the proviso that A1 doesn't fuse into A2;
LC has the structure of Formula II

OG Complex Work Unit Chemistry
each RA, RB, Ra1, Rb1 and Rc1 is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, germyl, boryl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, selenyl, and combinations thereof;
with the proviso that Ra1 and Rc1 are not both isobutyl when Rb1 is H,
any two adjacent RA, RB, Ra1, Rb1 and Rc1 in the compound can be joined or fused together to form a ring; and
if two RA are joined to form a ring when LA has the structure

OG Complex Work Unit Chemistry
said ring is a 5- or 6-membered ring.