| abstract |
The present invention provides a composition comprising a polymer comprising at least one phosphorescent organometallic compound and structural units derived from at least one monomer of formula (I):n n n In n n In which R 1 is H or CH 3 ; R 2 is H or C 1 -C 5 alkyl; R 3 is H or CH 3 ; R 4 and R 5 are independently H, CH 3 , t-butyl, triarylsilyl, trialkylsilyl, diphenyl phosphine oxide or diphenyl phosphine sulfide; m ranges from 1 to about 20; n ranges from 1 to about 20. Accordingly, the present invention also provides an organic light emitting device comprising a light emitting layer comprising at least one phosphorescent organometallic compound and a polymer comprising structural units derived from at least one monomer of the formula (I). |