Picosecond time-resolved fluorescence studies of poly(N-vinylcarbazole) using a pulse-radiolysis technique

Tagawa, Seiichi; Washio, Masakazu; Τabata, Yoneho

doi:10.1016/0009-2614(79)87200-0

Cited by 69 publications

(19 citation statements)

References 23 publications

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“…The polymer has been excited at three different wavelengths 280, 300 and 330 nm and consistent with the literature, no variation in the fluorescence decay pattern could be observed [19,22,35]. This reveals that only a single species is excited from the ground state and corroborates the steady state results.…”

Section: Time-resolved Studiessupporting

confidence: 86%

“…It has been reported that the high energy excimer is formed almost instantaneously following the excitation by a pulse of 10 ps duration. In contrast, the low energy emission assigned to the sandwich excimer requires a time of several nanoseconds for its development [22][23][24].…”

Section: Introductionmentioning

confidence: 92%

“…Tagawa et al [22,39] from their TRES study of PNVC in toluene using the picosecond single-pulse radiolysis have observed the formation time of the high energy emission to be less than 10 ps. This suggests that the partially overlapped excimer species is formed through singlet electron migration to preformed sites along the polymer chain where the necessary geometrical requirements for the excimer formation is satisfied prior to the excitation [22,39,40]. The sandwich excimer, responsible for the low energy emission, is however, formed from the partially overlapped species in the excited state only.…”

Section: Time-resolved Studiesmentioning

confidence: 97%

“…The authors could find a spectral shift in the fluorescence spectra taken at different time windows, although not so well resolved [21]. Tagawa et al [22] have applied picosecond time-resolved fluorescence spectroscopy to study the kinetics of excited state dimer formation in PNVC. It has been reported that the high energy excimer is formed almost instantaneously following the excitation by a pulse of 10 ps duration.…”

Section: Introductionmentioning

confidence: 97%

“…The first one involves investigation of the effect of different configurations of the polymer on the excimer formation through the use of model compounds [4] while the other concentrates on using time-resolved fluorescence techniques to study the kinetics of the photoprocess [21][22][23]. Hoyle et al used the multichannel scaling mode of the single photon counting apparatus to obtain the time-resolved emission spectra (TRES) of PNVC at different time windows.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Characterization of the excimers of poly(N-vinylcarbazole) using TRANES

Ghosh

Chattopadhyay

2011

Journal of Luminescence

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Section: Time-resolved Studiessupporting

confidence: 86%

Section: Introductionmentioning

confidence: 92%

Section: Time-resolved Studiesmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characterization of the excimers of poly(N-vinylcarbazole) using TRANES

Ghosh

Chattopadhyay

2011

Journal of Luminescence

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Photophysical studies of copolymers of N‐vinylcarbazole

Brar

Kaur

Balamurli

et al. 2006

J of Applied Polymer Sci

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ABSTRACT:The absorption, fluorescence excitation and emission spectroscopy, and time-dependent spectrofluorimetry have been used to study the photophysics of copolymers of N-vinylcarbazole with different monomers like vinyl acetate, methyl acrylate, methyl methacrylate, butyl acrylate, and butyl methacrylate in dichloromethane. In all the copolymers and at different N-vinylcarbazole content, the absorption spectra reflect only the monomer carbazole units. The two kinds of excited monomer species of N-vinylcarbazole are present in S 1 state. Short-lived (ϳ3 ns) excited monomer decays forming low energy excimer obtained by the complete overlap of the excited carbazole monomer. The long-lived excited monomer (ϳ8 ns) decays to ground state without formation of any excimer. The high energy excimer is relatively short-lived and is formed by the partial overlap of the carbazole units. The presence of bulky group in the copolymer chain hinders the formation of excimers.

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Laser photochemistry of polymers

Masuhara¹

1985

Makromol. Chem.

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bstract -Absorption spectra of poly (N-vinyl{arbazole) and related polymers in the excited singlet, triplet, cationic, and anionic states were measured by nanosecond and picosecond laser photolysis methods and compared with those of model bichromophoric compounds. Absorption spectral shape of the excited singlet and cationic states is a function of polymer structure and sensitive to relative geometrical structure of two carbazolylThe excited singlet species in po1y~~O~~~;ilcarbazole) are the sandwich excimer, the excited dimer with the partial overlap structure between two chromophores, and the so-called second excimer. The formation process of the sandwich excimer consists of an instantaneous rise and a slow one with a timeconstant of a few hundred ps. The absorption spectrum o f poly(N-vinylcarbazole) cation can be reproduced by a superposition of absorption bands of the sandwich dimer cation, the dimer cation with the partial overlap, and the dimer cation with the open form. On the other hand, absorption spectra of the triplet and anionic polymers are similar to those of the corresponding monomer model compound, showing a very weak interchromophoric interaction. All these results indicate that electronic excitation and charge in these polymers are not delocalized over several chromophores but trapped in some monomer and dimer sites. Dynamic behavior such as conformational change, intersystem crossing, photochemical formation yield of ion radicals, and their decay kinetics was also studied in detail.

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Picosecond time-resolved fluorescence studies of poly(N-vinylcarbazole) using a pulse-radiolysis technique

Cited by 69 publications

References 23 publications

Characterization of the excimers of poly(N-vinylcarbazole) using TRANES

Characterization of the excimers of poly(N-vinylcarbazole) using TRANES

Photophysical studies of copolymers of N‐vinylcarbazole

Laser photochemistry of polymers

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