Theoretical investigation on the electronic and optical properties of poly(fluorenevinylene) derivatives as light-emitting materials

• Main Authors: Kungwan N., Yakhanthip T., Jitonnom J., Anuragudom P., Jungsuttiwong S., Hannongbua S.
• Format: Journal
• Published: 2017
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=80053534903&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/42982
• Institution: Chiang Mai University

Density functional theory (DFT) and time-dependent DFT (TDDFT) were employed to study ground-state properties, HOMO-LUMO gaps (Δ H-L ), excitation energies (E g ), ionization potentials (IPs), and electron affinities (EA) for PFV-alt-PDONV and PFV-alt-PDIH-PPV having different alternating groups. Excited-state properties were investigated using configuration interaction singles (CISs) while fluorescence energies were calculated using TDDFT. The results show that PFV-alt-PDONV exhibits blue-shifted energies for both HOMO-LUMO gaps (Δ H-L ) and excitation energies (E g ) compared with PFV-alt-PDIH-PPV. The predicted IP and EA clearly indicate that PFV-alt-PDIH-PPV has both easier hole creation and electron injection than that of PFV-alt-PDONV. The maximal absorption wavelengths of all polymers are strongly assigned to π→π* transition. The predicted radiative lifetimes of PFV-alt-PDONV and PFV-alt-PDIH-PPV for B3LYP/6-31G(d) are 0.36 and 0.61ns, respectively, indicating that PFV-alt-PDIH-PPV should have a better performance for long-time emission than that of PFV-alt-PDONV. © 2011 Thanisorn Yakhanthip et al.