Ultrafast optical studies of ordered poly(3-thienylene-vinylene) films

作者：Olejnik, E.; Pandit, B.; Basel, T.; Lafalce, E.; Sheng, C. -X.; Zhang, C.; Jiang, X.^*; Vardeny, Z. V.

来源：Physical Review B, 2012, 85(23): 235201.

DOI：10.1103/PhysRevB.85.235201

• PI-CONJUGATED POLYMERS
• POLY(2,5-THIENYLENE VINYLENE)
• STATES
• GAP
• SPECTROSCOPY
• DERIVATIVES
• GENERATION

Using femtosecond transient photomodulation, photoluminescence, and electro-absorption spectroscopies, we studied the ultrafast photoexcitation dynamics and nonlinear optical properties of ordered poly(thienylene-vinylene) (PTV), which belongs to a rare class of nonluminescent, nondegenerate-ground-state pi-conjugated polymers. We show that the ordered PTV films contain abundant nanocrystalline domains that substantially influence the optical spectra as a result of aggregates formation. We demonstrate that the primary intrachain exciton (1(1)B(u)) decays within similar to 500 fs to the more stable "dark" exciton (2(1)A(g)), and the released energy results in both static strain and propagating strain wave that bounces back and forth in the polymer film.

• 出版日期2012-6-12
• 单位南京理工大学