Inhomogeneous broadening of organic dyes in polymeric media: nonlinear transmission spectra and photochemical kinetics

Bondar, Mykhailo V.; Przhonskaya, O. V.; Tikhonov, E. A.

doi:10.1021/j100205a043

Cited by 23 publications

(18 citation statements)

References 4 publications

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“…Solid polymeric matrices of PUA were obtained by the photopolymerization procedure reported previously. 10,11 The main feature of PUA compared with organic glasses (for example, PMMA) is the existence at room temperature of a highly elastic state (the glass-transition temperature is Ϸ210 K) characterized by high mobility of the polymeric chain segments compared with the glassy state. This property is responsible for the high resistance of PUA to radiation damage and for its self-healing ability.…”

Section: Materials and Experimentsmentioning

confidence: 99%

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Nonlinear light absorption of polymethine dyes in liquid and solid media

Przhonska¹,

Lim

Hagan

et al. 1998

J. Opt. Soc. Am. B

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We investigate nonlinear optical absorption of a series of polymethine dyes in liquid solution and in a solid poly(urethane acrylate) elastopolymer host. Depending on the ratio between the absorption cross section from the ground to the first excited state (01) and from the first to the higher excited states (12) and on the pump wavelength, they demonstrate absorption that either increases or decreases with increasing incident energy density. Our interest is directed at studying the optical limiting behavior of the dyes for sensor protection applications, which requires that 12 be greater than 01. We performed a detailed investigation of the dynamics of these processes, using Z-scan and pump-probe techniques at the single wavelength of 532 nm. We obtained 12 / 01 Ϸ 80 for one of the dyes, which is significantly higher than any previously reported value of which we are aware. The linear absorption remained significant, a requirement for good optical limiting. However, at high incident energy density for most of the dyes the increasing absorption converted to a bleaching effect with repeated irradiation. This effect was reversed after several seconds in liquid solutions and several minutes in the polymer host, possibly because of replenishment of the dye by diffusion in both media.

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Section: Materials and Experimentsmentioning

confidence: 99%

“…1(b)] has been described in many papers (e.g., Refs. 7,8,11,and 12). The transmittance depends on the relative values of the ground-state and excitedstate cross sections, 01 and 12 , respectively, and on the pumping wavelength; SA is possible for 01 Ͼ 12 [ Fig.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear light absorption of polymethine dyes in liquid and solid media

Przhonska¹,

Lim

Hagan

et al. 1998

J. Opt. Soc. Am. B

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“…So in recent years, solid-state dye lasers attract increasing attention because solid-state avoids the above problem and it is easy to use. The matrixes used mostly for solid-state dye lasers are polymers [1,2] and inorganic hosts [3,4]. Compared with polymer matrixes, inorganic molecular sieves have relatively higher laser damage thresholds and high surface areas, which make it possible to use high concentration dye without undesirable dye aggregation [5].…”

Section: Introductionmentioning

confidence: 99%

The Luminescence properties of coumarin-6 within Ti-HMS

Zhang

Anpo

2006

Journal of Luminescence

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“…Then, the fluorescence intensity will be controlled by the intrinsic photophysical pathways of the excited state molecules or moieties. In contrast, when motions of polymer segments were faster than the inverse of the fluorescence lifetime, their re‐orientation around the lumophore became possible, and the lumophores will return to the ground state (either radiatively or nonradiatively) through “relaxed” Franck‐Condon states 48–50. Therefore, when all segments of the polymeric chains, including the attached lumophore, were frozen, the decay of the lumophore in the electronic excited state would be originated from the unrelaxed FC state, and the emission efficiency would be controlled only by intrinsic nonradiative processes.…”

Section: Resultsmentioning

confidence: 99%

Fluorescence spectroscopy and thermal relaxation processes of anthracenyl‐labeled polysiloxanes

Domingues

Yoshida

Atvars

2009

J Polym Sci B Polym Phys

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A fluorescent silicone network was prepared by a hydrosilylation reaction using poly(dimethylsiloxane-co-methylhydrogensiloxane) terminated by dimethylhydrogensilyloxy groups, poly(dimethylsiloxane-co-methylvinylsiloxane) terminated by dimethylvinylsilyloxy groups and 9-vinylanthracene, as the fluorescent group. These silicone-based materials were strongly fluorescent. Steady state emission was a convenient technique to prove that reaction occurred, based on the blueshift of the emission from anthracenyl moieties compared with the 9-vinylanthracene. Thermal transitions were studied by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and by fluorescence spectroscopy, indicating that networks with and without lumophores had similar thermal properties. Networks with and without lumophores had the same swelling capability in toluene. Fluorescence spectroscopy was a more sensitive technique to the onset of the glass transition temperature (T ¼ 145 K) than DSC or DMA. Nevertheless, the crystallization temperature at 192 K was determined more precisely by DSC, and the melting point at 237 K was indentified more clearly by both DSC and DMA. These three techniques provided complementary information about transitions in silicone networks. V C 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: [74][75][76][77][78][79][80][81] 2010

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Inhomogeneous broadening of organic dyes in polymeric media: nonlinear transmission spectra and photochemical kinetics

Cited by 23 publications

References 4 publications

Nonlinear light absorption of polymethine dyes in liquid and solid media

Nonlinear light absorption of polymethine dyes in liquid and solid media

The Luminescence properties of coumarin-6 within Ti-HMS

Fluorescence spectroscopy and thermal relaxation processes of anthracenyl‐labeled polysiloxanes

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