Femtosecond pump-probe investigation on relaxation of photoexcitations and spectral narrowing of photoluminescence for poly(para- phenylenevinylene)
نویسندگان
چکیده
منابع مشابه
Ultrafast Dynamics of Photoexcited Carriers in HWCVD a-Si:H and a-SiGe:H
We present femtosecond studies of photoexcited carrier dynamics in hydrogenated amorphous silicon and silicon-germanium alloys grown by the hot-wire assisted chemical vapor deposition (HWCVD) technique, which is promising for producing high-quality device-grade materials. We have used wavelength-resolved femtosecond pump-probe techniques to study the dynamics of photoexcitations in these materi...
متن کاملMicrosecond spin-flip times in n-GaAs measured by time-resolved polarization of photoluminescence
We have observed microsecond spin-flip times in lightly doped n-GaAs, by measuring the photoluminescence polarization in the time domain with pump and probe pulses. Times up to 1.4 ms have been measured. Our results as a function of magnetic field indicate three regions governing the spin relaxation: a low field region, where spin-flip times increase due to suppression of the nuclear hyperfine ...
متن کاملUltrafast electronic and vibrational dynamics in brominated aluminum corroles: Energy relaxation and triplet formation
We combined femtosecond (fs) VIS pump-IR probe spectroscopy with fs VIS pump-supercontinuum probe spectroscopy to characterize the photoreaction of the hexacoordinated Al(tpfc-Br8)(py)2 in a comprehensive way. Upon fs excitation at ∼400 nm in the Soret band, the excitation energy relaxes with a time constant of (250 ± 80) fs to the S2 and S1 electronic excited states. This is evident from the r...
متن کاملEnhanced and tunable photoluminescence of polyphenylenevinylenes confined in nanocomposite films
Conformation of macromolecules and interchain interactions determine spectral properties of conjugated polymers (CP). An achievement of spatial confinement of isolated chains is one of the routes to use this feature of CP for their purposeful usage. In the present work, CP/O300 nanocomposites based on CP - poly(p-phenylenevinylene) and poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene) ...
متن کاملFemtosecond Dephasing Studies of Dye Molecules in a Polymer Host
The optical dephasing properties of molecular impurities in low-temperature amorphous solids have been extensively studied in recent years as a means of probing the host environment. Non-linear optical frequency domain techniques, such as fluorescence line narrowing [l]_ photochemical [2,3] and non-photochemical [4,5] hole burning, resonant Rayleigh scattering [6] and polarization spectroscopy ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2013