| abstract |
There is disclosed herein phosphorescent compounds, uses thereof, and devices including organic light emitting diode (OLEDs) including such compounds. n Compounds of interest include: n n n n n n n n n n n n wherein A is Os or Ru n n n n n The anionic chelating chromophores N̂N, which are formed by connecting one pentagonal ring structure containing at least two nitrogen atoms to a hexagonal pyridine type of fragment via a direct carbon-carbon linkage. n L is a neutral donor ligand; the typical example includes carbonyl, pyridine, phosphine, arsine and isocyanide; two neutral L's can also combine to produce the so-called chelating ligand such as 2,2′-bipyridine, 1,10-phenanthroline and N-heterocyclic carbene (NHC) ligand, or bidentate phosphorous ligands such as 1,2-bis(diphenylphosphino)ethane, 1,2-bis(diphenylphosphino)benzene. n L can occupy either cis or trans orientation. n When L occupies the trans position, the preferred structure contains both the hexagonal fragment of N̂N as well as its pentagonal fragment located at the trans position respect to their counterparts of the second N̂N chromophore. n When L occupies the cis position, the preferred structure consists of the pentagonal unit of N̂N chromophores residing opposite to the L.n X, 1 X 2 and X 3 independently are C or N; when X 2 is N, R 1 is omitted, when X 3 is N, R 2 is omitted, R 1 is H, C1-C8 alkyl, C1-C8 substituted phenyl or C1-C4 perfluoroalkyl, R 2 is H, F or cyano substituent, X 4 is either C or N; X 4 may locate at any position of the hexagonal ring, when X 4 is N and R 3 and R 4 are not linked to X 4 ,n nR 3 is H, methyl or C1-C3 small alkyl, R 4 is H, methyl or C1-C3 small alkyl, or R 3 and R 4 together form an additional conjugated unit with structure |