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Dioctylfluorene (DOF) and 4,7-dithien-2-yl-2,1,3-benzothiadiazole (DBT) copolymers synthesized in our lab with different compositions of DBT (1%, 5%, 15% and 25%) were utilized to fabricate bilayered light emitting diodes. External quantum efficiency (QE) of the diode fabricated from the copolymer with 15% DBT content reaches 1.4% (ph/el), over 1.0 cd/A in luminance efficiency at the driving voltage of 4.2 V. The highest luminance can reach 3780 cd/m2 at 8.2 V. Devices emit a saturated red light centered at 675 nm with chromaticity coordinate changed from x=0.66, y=0.32 for PDOF-DBT1 (1% DBT) to x=0.70, y= 0.28 for PDOF-DBT25 (25% DBT).
Dioctylfluorene (DOF) and 4,7-dithien-2-yl-2,1,3-benzothiadiazole (DBT) copolymers synthesized in our lab with different compositions of DBT (1%, 5%, 15% and 25% External quantum efficiency (QE) of the diode fabricated from the copolymer with 15% DBT content reaches 1.4% (ph / el), over 1.0 cd / A in luminance efficiency at the driving voltage of 4.2 V. FIG. The highest luminance can reach 3780 cd / m2 at 8.2 V. Devices emit a saturated red light centered at 675 nm with chromaticity coordinate changed from x = 0.66, y = 0.32 for PDOF-DBT1 (1% DBT) to x = 0.70, y = 0.28 for PDOF-DBT25 (25% DBT).