Laser properties of a conjugate polymer (MEH-PPV) in the liquid-excimeric state

Masilamani, V.; Ibnaouf, K.H.; AlSalhi, Mohamad S.; Yassin, O.A.

doi:10.1134/s1054660x07120055

Cited by 24 publications

(21 citation statements)

References 13 publications

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“…In the concentration range of 100 µM -300 µM, the excimer and double excimer are in competition as much as the monomer and the excimer in the range 0.5 -5.0 µM. However, this particular molecule exhibits easier tendency to form excimer [10] but not double excimer. Because of these two reasons, the number of molecule existing in the double excimer state and stimulated emission cross section of both could be far smaller than the (single) excimeric state.…”

Section: Ases Spectramentioning

confidence: 94%

“…This was used to do transverse excitation of the MEH-PPV solution taken in a four-side polished quartz cell, which was kept canted to avoid feedback. See reference [10] for more details. At optimum values of the pump power and concentrations of MEH-PPV, we observed an ASE beam coming out as a cone of light.…”

Section: Methodsmentioning

confidence: 99%

“…This peak coincided with the maximum of the fluorescence emission spectrum at this concentration, as shown in Figure 6. One can immediately see that the ASE with high degree of optical gain and hence the laser action had been produced from the excimeric state [10].…”

Section: Ase Spectrummentioning

confidence: 99%

“…The results showed that the conjugated conducting polymer MEH-PPV could exist in the excimer state in a few solutions [9]. The amplified spontaneous emission characteristics (ASE) of MEH-PPV in different solvents and at different concentrations were studied under pulsed-laser excitation at 355 nm and 532 nm; the conversion efficiency of MEH-PPV is comparable to other conventional laser dyes Rhodamine B and Rhodamine 6G [10].…”

Section: Introductionmentioning

confidence: 99%

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Evidence for the Double Excimer State of conjugated polymer in a liquid solution

Ibnaouf

Prasad

Masilamani

et al. 2013

J. Eur. Opt. Soc.-Rapid Publ.

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In this paper, the spectral properties of a conjugated polymer poly [2-methoxy-5-(2-ethylhexyloxy)-1, 4-phenylenevinylene] (MEH-PPV) in benzene have been studied. The results showed that the fluorescence spectra of MEH-PPV under low concentrations had two peaks; the dominant one due to monomer was around 560 nm, and the shoulder one attributed to the excimer was around 600 nm. Under higher concentrations, it was found that there was only one band around 600 nm due to the excimeric state. By increasing the concentrations of MEH-PPV, it could be seen that there was a new band around 640nm. This band is being attributed to the double excimer. Under high power pulsed laser excitation, we observed amplified spontaneous emission (ASE) at 570 nm, 605 nm and 650 nm. These ASE peaks could arise from the monomer, excimer and double excimer states of the macromolecule respectively. To the best of our knowledge this is perhaps the first report on ASE from double excimer of the conjugated polymer, MEH-PPV in liquid solution.

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Section: Ases Spectramentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Section: Ase Spectrummentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evidence for the Double Excimer State of conjugated polymer in a liquid solution

Ibnaouf

Prasad

Masilamani

et al. 2013

J. Eur. Opt. Soc.-Rapid Publ.

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“…However, the intrinsically toxic components in QDs (e.g., cadmium and selenium) that can be released in biological media may cause serious damage to living biological species . Recently, conjugated polymers have attracted considerable attention for biological analysis and imaging owing to excellent photostability, less susceptible to concentration‐quenching effects, large extinction coefficient, and low cytotoxicity . Moreover, their absorption and emission spectra can be fine‐tuned via backbone modifications, because conjugated polymers are macromolecules with π‐conjugated backbones.…”

mentioning

confidence: 99%

A Tunable Optofluidic Microlaser in a Photostable Conjugated Polymer

et al. 2018

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The optofluidic laser has become an important platform for biological sensing and medical diagnosis. To date, fluorescent dyes and proteins have been widely utilized as gain materials for biological analysis due to their good biocompatibility, but the limited photostability restricts their reliability and sensitivity. Here, an optofluidic microlaser with an ultralow threshold down to 7.8 µJ cm−2 in the ultrahigh‐Q whispering‐gallery microcavity, which is filled with a biocompatible conjugated polymer, is demonstrated. This conjugated polymer exhibits a significant enhancement in the lasing stability compared with a typical laser dye (Nile red). In the experiment, after 20 min of illumination with the excitation intensity of 23.2 MW cm−2, the lasing intensity of the conjugated polymer experiences a decrease of less than 10%, while the lasing feature of Nile red completely disappears. Additionally, by mechanically stretching the resonator, the lasing frequency can be fine‐tuned with the range of about 2 nm, exceeding the free spectral range of the resonator.

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