1253582-64-7

Upstream product

• 57381-43-8 2,5-dibromobenzoic acid methyl ester 
• 98-88-4 benzoyl chloride 

Downstream Products

• 1253582-65-8 1-((2,5-dibromophenyl)chloromethylene)-2-(chloro(phenyl)methylene)hydrazine 
• 1253582-66-9 N-(4-(3-(2,5-dibromophenyl)-5-phenyl-4H-1,2,4-triazol-4-yl)phenyl)-N-phenylbenzenamine 
• 1331857-44-3 9-(4-(3-(2,5-dibromophenyl)-5-phenyl-4H-1,2,4-triazol-4-yl)-phenyl)-9H-carbazole 

Relevant academic research and scientific papers

Copolyfluorenes containing pendant bipolar carbazole and 1,2,4-triazole groups: Synthesis, characterization, and optoelectronic applications

Three novel copolyfluorenes (P1-P3) containing pendant bipolar groups (2.5-7.7 mol %), directly linked hole-transporting carbazole and electron-transporting aromatic 1,2,4-triazole, were synthesized by the Suzuki coupling reaction and applied to enhance emission efficiency of polymer light-emitting diodes based on conventional MEH-PPV. The bipolar groups not only suppress undesirable green emission of polyfluorene under thermal annealing, but also promote electron- and hole-affinity of the resulting copolyfluorenes. Blending the bipolar copolyfluorenes with MEH-PPV results in significant enhancement of device performance [ITO/PEDOT:PSS/MEH-PPV+P1, P2 or P3/Ca(50 nm)/Al(100 nm)]. The maximum luminance and luminance efficiency were enhanced from 3230 cd/m2 and 0.29 cd/A of MEH-PPV-only device to 15,690 cd/m2 and 0.81 cd/A (blend device with MEH-PPV/P3 = 94/6 containing about 0.46 wt % of pendant bipolar residues), respectively. Our results demonstrate the efficacy of the bipolar copolyfluorenes in enhancing emission efficiency of MEH-PPV.

Copolyfluorenes containing pendant bipolar groups: Synthesis, optoelectronic properties and applications

This article reports the synthesis of copolyfluorenes (P1-P3) containing pendant bipolar groups (2.1-8.2 mol%), directly linked to hole-transporting triphenylamine and electron-transporting aromatic 1,2,4-triazole, by the Suzuki coupling reaction and their application in improving PLED performance of conventional MEH-PPV. The bipolar groups not only suppress undesirable green emission of polyfluorene under thermal annealing, but also promote electron- and hole-affinity of the resulting copolyfluorenes. Blending bipolar model compound M0 with MEH-PPV results in enhancement of device performance [ITO/PEDOT:PSS/M0 + MEH-PPV/Ca(50 nm)/Al(100 nm)]. Maximum luminance and luminance efficiency were increased from 3160 cd/m2 and 0.24 cd/A of MEH-PPV-only device to 6830 cd/m2 and 0.50 cd/A. Moreover, blending the bipolar copolyfluorenes with MEH-PPV further improves the device efficiency, with the maximum luminance and luminance efficiency being significantly enhanced up to 11090 cd/m2 and 0.56 cd/A (ca. 0.4 wt% of bipolar residue), respectively. Our results demonstrate the efficacy of the bipolar copolyfluorenes and model compound M0 in enhancing emission efficiency of MEH-PPV.