Synthesis and characterization of new polyfluorene derivatives: using phenanthro[9,10-d]imidazole group as a building block for deep blue light-emitting polymer

Abstract

A series of novel polyfluorene derivatives P1/4, P2/4, and P3/4, containing phenanthro[9,10-d]imidazole group on backbone are designed, synthesized, and well characterized. They all show high-molecular weights, good solubilities, and excellent thermal stabilities. The CV results of all three compounds show the lower LUMO levels and higher HOMO levels than PF. Among them, P3/4 exhibits deep blue emission both in solution and in solid state. The PLED based on P3/4 shows higher device performance and locates in the deep blue region with a CIE coordinate of (0.17, 0.08).

Tuning the optical properties of ethynylene triptycene‐based copolymers via oxidation of their alkyne groups into α‐diketones

“…It is noteworthy that conjugated polymers are employed in many potential optoelectronic applications, such as, field‐effect transistors, electroluminescent devices, solar cells, and sensors . Among others, polymer light‐emitting diodes (PLEDs) from polyfluorene (PF) derivatives have been widely studied because they possess many advantages, like, high quantum yields, excellent processability in different solvents, and good charge transport properties . However, ethynylene units proved to be efficient building blocks in the polymer structures because they can undergo further functionalization reactions resulting in polymers with enhanced properties …”

Demulsification of W/O emulsions using highly branched polymer demulsifier with 2,6‐naphthalenedicarboxylate as centronucleus

“…The chemical shift of methylene groups in hyperbranched molecules is located from 2.50 to 3.50 ppm 16 . The peaks from 7.7 to 8.5 ppm are attributed to the chemical shift of the H proton at the centronucleus 17 . The 1 H protons at different parts of the PNDC molecule have the same chemical shifts because of their similar positions.…”

“…16 The peaks from 7.7 to 8.5 ppm are attributed to the chemical shift of the H proton at the centronucleus. 17 The 1 H protons at different parts of the PNDC molecule have the same chemical shifts because of their similar positions. For example, the chemical shift of H b , H f , and H j is located at 2.75 ppm.…”