Synthesis and light-emitting properties of a carbazole-containing hyperbranched conjugated poly(phenylene vinylene)

Abstract

A new carbazole-containing hyperbranched conjugated poly(phenylene vinylene) (Hyper-PCPPV) was synthesized through the Wittig polycondensation polymerization. Hyper-PCPPV has good solubility in common organic solvents and showed excellent thermal stability up to 425 °C with less than 5% weight loss. The photophysical properties of Hyper-PCPPV were investigated and compared with a carbazole-containing linear conjugated poly(para-phenylene vinylene) (Linear-PCPPV). An absorption maximum of Hyper-PCPPV film was determined at 353 nm which was far blue shifted than that of Linear-PCPPV (403 nm). Hyper-PCPPV showed blue photoluminescence (PL) peak at 448 nm. In addition, Hyper-PCPPV exhibited almost no excimer or aggregate emission peaks even when the polymer film was annealed at 80 °C for 30 min in air condition.

Keywords:

• carbazole
• hyperbranched polymer
• photoluminescence

Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2019R1F1A1060813) and Kyungsung University Research Grants in 2019.

Additional information

Funding

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2019R1F1A1060813) and Kyungsung University Research Grants in 2019.