Photophysics of segmented block PPV copolymer derivatives

Kyllo, Erica; Gustafson, Terry L.; Wang, Daike K; Sun, Rong; Epstein, Arthur J.

doi:10.1016/s0379-6779(00)00484-7

Cited by 15 publications

(8 citation statements)

References 13 publications

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“…6 and 7 the radiative and non-radiative rates calculated from the Strickler-Berg equation agree with the previous assumption as to the reduction of the vibrational intensities having a significant effect on the non-radiative decay dynamics. Furthermore the fluorescence lifetimes calculated from the rates are consistent with the documented PPV derivative lifetime measurements [26]. The polymer fluorescence lifetimes can be calculated to be in the order of nanoseconds as is expected of substituted PPV systems [27].…”

Section: Resultssupporting

confidence: 80%

Correlation of vibrational intensity with fluorescence lifetimes in π conjugated polymers

O’Neill¹,

Lynch²,

McNamara³

et al. 2008

Polymer

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a b s t r a c tA series of novel pi (p) conjugated polymers, originating from the archetypical Polyphenylene vinylene, in which the phenyl units are successively replaced by the larger naphthyl and anthryl acene units, were previously found to have a well-defined relationship between their relative fluorescence yields and their vibrational characteristics, as determined by Raman spectroscopy. In this study the Strickler-Berg equation is used to probe the influence of continual substitution of higher order acene units into the conjugated backbone in terms of the variation of the radiative and non-radiative rates. The deconvolution of the radiative and non-radiative rates enables the correlation of the reduction of the Raman intensity and concomitant increase in the fluorescence yield with the reduction of the non-radiative rate. This confirms that the reduction of the non-radiative rate is the dominant process introduced by the vibrational confinement originating from systematic substitution of higher order acene units into the polymer backbone.

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Section: Resultssupporting

confidence: 80%

Correlation of vibrational intensity with fluorescence lifetimes in π conjugated polymers

O’Neill¹,

Lynch²,

McNamara³

et al. 2008

Polymer

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“…The confinement of the effective conjugation does not allow the charge carriers to diffuse along the polymer chain, thus limiting their transport to quenching sites. 21,22 A notable variation is observed in the absorption and emission behavior between P1 and P3 though the conjugation unit remains the same in these polymers. This may be due to the presence of additional conjugated unit (cyanophenylene units) in P3 as compared to P1.…”

Section: Linear Optical Propertiesmentioning

confidence: 92%

D-A conjugated polymers containing substituted thiophene, 1,3,4-oxadiazole and non-conjugation linkers: Synthesis and study of optical and electrochemical properties

Udayakumar

et al. 2016

J Chem Sci

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Abstract. In this communication, we report synthesis and characterization of new D-A conjugated polymers (P1-P3) consisting of electron-donating (D) 3,4-didodecyloxythiophene, electron-accepting (A) 1,3,4-oxadiazole unit and non-conjugation linkers. The conjugated segment in P1-P3 contains only five aromatic rings resulting in short conjugation length, but has an alternate D-A arrangement which significantly enhances the intramolecular charge transfer (ICT) interaction within the segment. As a result, these polymers exhibited low optical band gap in the range 2.51-2.76 eV. Fluorescence emission studies revealed that the polymer thin films emit intense blue light with emission maxima in the wavelength rage 430-480 nm. All three polymers undergo both oxidation and reduction processes under electrochemical conditions. Further, these polymers (P1-P3) exhibit low-lying HOMO and LUMO levels as a result of D-A structure of the conjugated segment. Polymer light-emitting devices were fabricated using these polymers as emissive layer with a device configuration of ITO/MoO 3 /polymer/LiF/Al. The test device based on P2 emitted blue light with a low threshold voltage of 5 V. Z-scan studies reveal that the polymers exhibit a strong optical limiting behavior. The value of the nonlinear absorption coefficient (β) of polymers is of the order 10 −11 m/W which indicates that these materials may be accomplished for fabricating optical limiters.

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“…Polymer light-emitting diode (often abbreviated as PLED)-based luminescent displays are already in the marketplace. A block copolymer approach can be used to achieve color tunability (Kyllo et al, 2001;Yang et al, 1998) C-C-C-in a di-block copolymer). By adjusting the block length (oligomer length) of the emitting block conjugated segment (say -B-B-B-in Figure 8.3), the color of emission can be varied.…”

Section: Nanostructured Polymeric Mediamentioning

confidence: 99%

“…An example of the type of block copolymer containing conjugate-nonconjugated blocks is provided in Figure 8.5. It consists of the conjugated segments of PPV (poly-p-phenylene vinylene) block in the form of a methoxy derivative, separated by nonconjugated aliphatic segments -OC 6 H 12 -O- (Kyllo et al, 2001). This type of block copolymer has shown that the color (wavelength) of emission is controlled by the conjugation length (length of the conjugated block) and not affected by the length of the nonconjugated block, sometimes called inert spacer.…”

Section: Nanostructured Polymeric Mediamentioning

confidence: 99%

Nanostructured Molecular Architectures

Prasad¹

2004

Nanophotonics

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Photophysics of segmented block PPV copolymer derivatives

Cited by 15 publications

References 13 publications

Correlation of vibrational intensity with fluorescence lifetimes in π conjugated polymers

Correlation of vibrational intensity with fluorescence lifetimes in π conjugated polymers

D-A conjugated polymers containing substituted thiophene, 1,3,4-oxadiazole and non-conjugation linkers: Synthesis and study of optical and electrochemical properties

Nanostructured Molecular Architectures

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