US 11,753,425 B2
Organic electroluminescent materials and devices
Pierre-Luc T. Boudreault, Pennington, NJ (US); Eric A. Margulies, Philadelphia, PA (US); and Bert Alleyne, Newtown, PA (US)
Assigned to UNIVERSAL DISPLAY CORPORATION, Ewing, NJ (US)
Filed by UNIVERSAL DISPLAY CORPORATION, Ewing, NJ (US)
Filed on Jun. 17, 2019, as Appl. No. 16/442,839.
Claims priority of provisional application 62/696,383, filed on Jul. 11, 2018.
Prior Publication US 2020/0017536 A1, Jan. 16, 2020
Int. Cl. H01L 51/00 (2006.01); C07F 15/00 (2006.01); H10K 50/11 (2023.01); H10K 85/30 (2023.01); H10K 85/60 (2023.01)
CPC C07F 15/0033 (2013.01) [C07F 15/0086 (2013.01); H10K 50/11 (2023.02); H10K 85/342 (2023.02); H10K 85/346 (2023.02); H10K 85/622 (2023.02); H10K 85/654 (2023.02); H10K 85/6572 (2023.02); H10K 85/6576 (2023.02)] 12 Claims
OG exemplary drawing
 
1. A compound having a formula of M(LA)2(LB),
wherein a ligand LA has the structure of Formula I

OG Complex Work Unit Chemistry
wherein ring C is benzene;
wherein RA bonds para to the nitrogen of pyridine;
RB bonds meta relative to the bond to the pyridine and is selected from the group consisting of isopropyl, t-butyl, and cyclohexane;
when RB is isopropyl, RA is selected from the group consisting of

OG Complex Work Unit Chemistry
when RB is t-butyl, RA is selected from the group consisting of

OG Complex Work Unit Chemistry
when RB is cyclohexane, RA is selected from the group consisting of

OG Complex Work Unit Chemistry
RC is hydrogen;
M is Ir;
LB is

OG Complex Work Unit Chemistry
wherein Ra and Rc are methyl and Rb is hydrogen.