Time-resolved emission studies of poly(n-v1nyl carbazole) using pulsed laser excitation

Roberts, A. J.; Cureton, C.G.; Phillips, David

doi:10.1016/0009-2614(80)80352-6

Cited by 47 publications

(19 citation statements)

References 5 publications

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“…The fluorescence decay profiles of PVK are similar to that mentioned in the literature,11, 12, 22 i.e., the decay profiles of PVK on the average can be described by three lifetimes in the range 3, ∼8, and ∼15 ns. At high energy side (360–380 nm), double exponential decay observed in the fluorescence intensity corresponds to the higher energy excimer and the carbazole monomer.…”

Section: Resultssupporting

confidence: 79%

“…As the λ em increases, the amplitude of the high energy species with lifetime ∼3 ns decreases and it is replaced by a low energy excimer with lifetime ∼15 ns. The negative amplitude of high energy species suggests that low energy excimer is formed from this species, as suggested in the literature 11, 12, 24…”

Section: Resultssupporting

confidence: 70%

“…In this paper, we name them as high energy and low energy excimers, respectively. A lot of work has been carried out to understand the mechanism of their formation and the structural origin of these excimers 4–24. Theoretical treatments, as well as, molecular dynamic simulations have also been carried out to strengthen the experimental findings 25, 26.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 79%

Section: Resultssupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

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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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“…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: 91%

“…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%

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

Ghosh

Chattopadhyay

2011

Journal of Luminescence

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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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Time-resolved emission studies of poly(n-v1nyl carbazole) using pulsed laser excitation

Cited by 47 publications

References 5 publications

Photophysical studies of copolymers of N‐vinylcarbazole

Photophysical studies of copolymers of N‐vinylcarbazole

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

Laser photochemistry of polymers

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