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Several highly efficient iridium-complex polymer light-emitting devices (PLEDs) are fabricated,with a newly synthesized blue conjugated polymer,poly[(9,9-bis(4-(2-ethylhexyloxy)phenyl)-fluorene)-co-(3,7-dibenziothiene-S,S-dioxide15)] (PPF-3,7SO15),chosen as host.High luminous efficiencies of 7.4 cd·A 1 and 27.4 cd·A 1 are achieved in red and green PLEDs,respectively,by optimizing the doping concentrations of red phosphorescent dye iridium bis(1-phenylisoquinoline) (acetylacetonate) (Ir(piq)) and green phosphorescent dye iridium tris(2-(4-tolyl)pyridinato-N,C 2) (Ir(mppy) 3).Furthermore,highly efficient white PLEDs (WPLEDs) with the Commission Internationale de l’Eclairage (CIE) coordinates of (0.35,0.38) are successfully produced by carefully controlling the doping concentration of the irid-ium complex.The obtained WPLEDs show maximal efficiencies of 14.4 cd·A 1 and 10.1 lm·W 1,which are comparable to those of incandescent bulbs.Moreover,the electroluminescent spectrum of the white device with an initial luminance of about 1000 cd·m 2 is stable,subject to constant applied current stress,indicating that good device stability can be obtained in this system.
Several highly efficient iridium-complex polymer light-emitting devices (PLEDs) are fabricated with a newly synthesized blue conjugated polymer, poly [(9,9- bis (4- ethylhexyloxy) phenyl) -fluorene) 3,7-dibenzothiene-S, S-dioxide 15]] (PPF-3,7SO15), chosen as host. High luminous efficiencies of 7.4 cd · A 1 and 27.4 cd · A 1 are achieved in red and green PLEDs, respectively, by optimizing the doping concentrations of red phosphorescent dye iridium bis (1-phenylisoquinoline) (acetylacetonate) (Ir (piq)) and green phosphorescent dye iridium tris (2- (4-tolyl) (3) .Furthermore, highly efficient white PLEDs (WPLEDs) with the Commission Internationale de l’Eclairage (CIE) coordinates of (0.35,0.38) were successfully produced by carefully controlling the doping concentration of the irid-ium complex. The WPLEDs show maximal efficiencies of 14.4 cd · A 1 and 10.1 lm · W 1, which are comparable to those of incandescent bulbs. More over, the electroluminescent spectrum of the white device with an initial luminance of about 1000 cd · m 2 is stable, subject to constant applied current stress, indicating that good device stability can be obtained in this system.