An organic light emitting device is provided. The device has an anode, a cathode,
and an emissive layer disposed between the anode and the cathode. The emissive
layer further comprises an emissive material having the structure:
##STR1##
M may be a metal having an atomic weight greater than 40. R3 may be
a substituent having a Hammett value less than about -;0.17, between about -;0.15
and 0.05, or greater than about 0.07. R5 may be H or any substituent.
A may be a 5 or 6 member heteroaryl ring system. "m" may be at least 1. "n" may
be at least zero. (X-Y) may be an ancillary ligand. The emissive material itself
is also provided. The emissive material may have improved stability, and may provide
a saturated blue emission.
